BUILDING CONTROL GUIDANCE FOR NEW DWELLINGS & GARAGES

Transcription

1 BUILDING CONTROL GUIDANCE FOR NEW DWELLINGS & GARAGES Dwellings upto 2 storeys with additional guidance for 3 storeys OCTOBER 2010: EDITION 5

2 Introduction This document intends to provide education and guidance on how some of the technical design and construction requirements of the Building Regulations 2010 can be achieved and met for new dwellings up to two storeys in height and within 4.5m of ground level and additional guidance is given for three storeys in height which has a floor 4.5m above ground level. In all cases the design and construction of the proposed works is the responsibility of the designer, applicant and contractor and should be carried out to the relevant submitted and approved design. For further information reference should be made to the relevant Approved Document or standard as well as consulting a suitably qualified and experienced construction professional. The Approved Documents, which are listed below are available to view on the Communities and Local Government web site: or to purchase from The Stationary Office (TSO) on line at or telephone: However, the Building Regulation requirements may be satisfied in other ways or nonstandard ways by calculations or test details from a manufacturer or an approved 3rd party method of certification such as BBA (British Board of Agreement) Certificate. This document can be made available on a range of other formats if required. For further information please contact us on Approved Documents and sections they cover; A: Structure (2004 edition) including TRADA span tables for solid timber members in floors, ceilings and roofs for dwellings (2nd edition 2008)*; B1: Fire safety in dwelling houses (2006 edition); C: Site preparation and resistance to contaminants & moisture (2004 edition); D: Toxic substances (1992 with 2002 amendments); E: Resistance to the passage of sound (2003 with 2004 amendments); F: Ventilation (2010 edition); G: Sanitation, hot water safety and water efficiency (2010 edition); H: Drainage and waste disposal (2002 edition); J: Combustion appliances & fuel storage systems (2010 edition); K: Protection from falling, collision and impact (1998 with 2002 amendments); L1A: Conservation of fuel and power in new dwellings (2010 edition); M: Access and use of buildings (for disabled, 2004 edition) N: Glazing Safety in relation to impact, opening & cleaning (1998 with 2000 amendments); P: Electrical safety (2006 edition); Regulation 7 Materials and workmanship (1992 with 2000 amendments). Other guidance documents available: New extensions/garages, Loft Conversions, Commercial/industrial buildings & Fire Safety for Conversion of buildings into Holiday Lets, Guest Houses & Supervised Groups with Learning Difficulties. Important note: Typical section details have been provided in these guidance notes for the more common construction methods used in dwellings. These details are suggested methods of construction and are for guidance only. You are advised to contact a suitably qualified and experienced property professional for details and specifications for the most suitable form and method of construction for your project. 2

3 CONTENTS PAGE NUMBER INTRODUCTION ENGAGING A PROPERTY PROFESSIONAL OBTAINING BUILDING REGULATIONS APPROVAL 3.0 EXEMPT BUILDINGS & WORK COMPETENT PERSON SCHEME 5.0 PLANNING PERMISSION, LISTED BUILDING & CONSERVATION AREA CONSENTS 6.0 THE PARTY WALL ACT CONSTRUCTION (DESIGN MANAGEMENT) REGULATIONS AND HEALTH & SAFETY AT WORK ACT 8.0 GENERAL TECHNICAL & PRACTICAL GUIDANCE FOR PROJECTS 10 PREPARATION, PROTECTION, ACCESS AND DEMOLITION PART A: STRUCTURE 11 A1: SUB STRUCTURE Foundations (including basements) Diagram 1: Elevation of stepped foundation Ground bearing solid concrete floors 12 Diagram 2: Typical section through a ground bearing solid concrete floor & foundation Suspended beam & block ground floor Diagram 3: Typical section through a suspended beam & block ground floor 13 Suspended timber ground floor Diagram 4: Typical section through a suspended timber ground floor 14 Table 1: Ground floor & suspended ground floor insulation requirements Garage concrete floor 15 Diagram 5: Typical section through a garage floor & foundation A2: SUPERSTRUCTURE 16 Cavity walls Table 2: Insulation requirements for external cavity walls Semi Exposed Walls Table 2.1: Insulation requirements to semi exposed walls External timber framed walls with separate brick or block finish 17 External timber framed walls with render finish 18 Diagram 6: Typical section through external timber framed walls with render finish External timber framed walls with cladding finish 17 Diagram 7: Typical section through external timber framed walls with cladding finish 19 Detached garage with SINGLE SKIN external walls Diagram 8: Design criteria for small detached single storey garages or similar 20 Plan view of garage Wall abutments 21 Lintels & weep holes Structural columns/beams etc Expansion joints Strapping and restraint Cavity Closers A3: SEPARATING WALLS & FLOORS Masonry party walls separating dwellings Timber frame party walls separating buildings 22 Upgrading sound insulation of existing separating walls Party floors separating buildings Sound testing requirements A4: ADDITIONAL PROVISIONS FOR 3 STOREY BUILDINGS Compressive strength of masonry units A5: INTERNAL PARTITIONS 23 Internal load bearing masonry partitions Internal load bearing timber stud partitions Internal masonry non-load bearing partitions 3

4 Internal timber studwork non-load bearing partitions A6: INTERMEDIATE UPPER FLOORS 24 Table 3: Spans for Common Domestic Floor Joist Sizes Table 4: Spans for Common Trimmer Joist supporting Trimmed Joists Table 5: Spans for Common Trimming Joist supporting Trimmer Joist Sound insulation to floors within the dwelling 25 SVP pipe boxing Exposed intermediate upper floors Diagram 9: Typical section through an upper floor Table 6: Insulation requirements to exposed intermediate floors A7: PITCHED ROOFS 26 Pitched roof coverings Pitched roof structure Roof trusses (including attic & girder trusses) Cut roof construction Diagram 10: Typical section through a pitched roof 27 Table 7: Spans for Common Domestic Timber Rafter Sizes at 400mm spacing Table 8: Spans for Common Domestic Timber Ceiling Joist Sizes at 400mm spacing 29 Table 9: Spans for Common Domestic Timber Purlin Sizes Table 10: Permissible Clear Spans for Common Ceiling Binders Sizes Roof restraint Roof insulation Table 11: Insulation laid horizontally between and over ceiling joists Table 12: Insulation fixed between/under rafters 29 Table 13: Insulation fixed between/over rafters Diagram 11: Typical roof valley detail Diagram 12: Typical section through a dormer roof 30 Ventilation to pitched roofs A8: FLAT ROOF CONSTRUCTION 31 Table 14: Spans for Common Flat Roof Joist Sizes 32 Table 15: Insulation Fixed Between/Under Flat Roof Joists Table 16: Insulation Fixed above Flat Roof Joists Diagram 13: Typical section through a flat (cold) roof 33 Valleys and lead work Lofts hatches, doors & Light wells to roof spaces PART B: FIRE SAFETY & MEANS OF ESCAPE 34 Smoke /heat alarms Means of escape windows Fire doors & frames Means of escape from basements Permitted building openings in relation to a boundary: Openings within 1.0m of a boundary & openings more than 1.0m from a boundary Table 17: Permitted unprotected areas in relation to a relevant boundary Fire resistance to elements of structure etc 35 Table 18: Fire resistance to common elements of structure etc Surface spread of flame: wall & ceiling linings Table 19: Surface spread of flame: Classification of wall & ceiling linings Additional fire safety & means of escape provisions for new 3 storey dwellings 36 Residential sprinkler systems for means of escape PART C: SITE PREPARATION AND RESISTANCE TO CONTAMINANTS & MOISTURE 37 Horizontal damp proof courses & trays (dpc s) Vertical damp proof courses & trays etc (dpc s) Radon gas protection in sub structures 3 alternative methods for full radon gas protection in sub structures Methane & other gas protection in sub structures Tanking systems & Flood risk 38 4

5 PART D: CAVITY WALL FILLING WITH INSULATION BY SPECIALISTS PART E: RESISTANCE TO THE PASSAGE OF SOUND 39 PERFORMANCE STANDARDS Party walls and floors separating new dwelling/flats. Party walls and floors separating conversion of buildings into new dwellings/flats Exemptions/ relaxations for conversion of historic buildings into dwellings/flats PRE COMPLETION SOUND TESTING Testing rate requirements Remedial works and re-testing NEW INTERNAL WALLS & FLOORS PART F: VENTILATION 40 Ventilation systems Purge (natural) ventilation Mechanical extract ventilation 41 Background ventilation Background ventilation: Table A & Table B 42 PART G: SANITATION, HOT WATER SAFETY AND WATER EFFICIENCY 43 PART H: DRAINAGE AND WASTE DISPOSAL 44 H1: FOUL WATER DRAINAGE New foul water connections to the public sewer Foul, rain & storm water drainage systems Waste pipes H2: SEPTIC TANKS, SEWAGE TREATMENT SYSTEMS & CESSPOOLS 45 Existing septic tank & effluent drainage Non mains foul drainage waste water treatment systems Septic tanks Sewage treatment systems 46 Treatment of sewage from septic tanks & sewage treatment systems Drainage fields Drainage mounds Wetlands / reed beds 47 Percolation test method to calculate area of drainage field. Diagram 14: Typical section through a septic tank/sewage treatment system drainage field 48 Diagram 14.1: Typical drainage field layout H3: RAINWATER DRAINAGE AND HARVESTING 49 Rainwater gutters and down pipes Table 20: Gutter sizes & pipe outlet sizes for drainage of roof areas Rainwater/ grey water harvesting storage tanks & systems Surface water drainage around the building Oil/fuel separators 50 H4: BUILDING OVER OR CLOSE TO PUBLIC SEWERS H5: SEPARATE SYSTEMS OF DRAINAGE H6: SOLID WASTE STORAGE PART J: COMBUSTION APPLIANCES & FUEL STORAGE SYSTEMS 51 SPACE & HOT WATER HEAT PRODUCING APPLIANCES IN GENERAL SOLID FUEL APPLIANCES UP TO 50KW RATED OUTPUT Construction of open fire place with recess & hearth Free standing stove with hearth Air supply (ventilation) to solid fuel appliances Table 21: Air supply (ventilation) to solid fuel appliances 52 Carbon monoxide alarms Table 22: Sizes of flues in chimneys Construction of masonry chimneys 53 Construction of factory made flue block chimneys Construction of factory made metal chimneys 5

6 Configuration of flues serving open flue appliances Inspection & cleaning openings in flues Interaction of mechanical extract vents & opened flue solid fuel appliances Chimney heights 54 Repair/relining of existing flues Notice plates for hearths & flues APPLIANCES OTHER THAN SOLID FUEL Interaction of mechanical extract vents & opened flue combustion appliances Gas appliances Oil appliances Gas heating appliances up to 70kw Oil heating appliances up to 45kW 55 Renewable energy Installations Provision of information- commissioning certificates (testing) FUEL STORAGE TANKS LPG tanks and cylinders up to 1.1 tonnes Oil tanks up to 3500 litres PART K: PROTECTION FROM FALLING, COLLISION AND IMPACT 56 Internal stairs, landings and changes in level of 600mm or more Diagram 15: Measuring rise & goings Diagram 16: Typical internal stair case & guarding construction details 57 External stairs, landings and changes in level of 600mm or more Guarding to upper storey window openings/other openings within 800mm of floor level PART L: CONSERVATION OF FUEL AND POWER IN NEW DWELLINGS 58 TARGET & DWELLING EMISSIONS RATES SAP RATING & ENERGY PERFORMANCE CERTIFICATE Fabric standards (worst acceptable standards) Recommended starting u values U values for party walls ENERGY EFFICIENT LIGHTING 59 LIMITING THE EFFECTS OF SOLAR HEAT GAINS IN SUMMER LIMITING THERMAL BRIDGING AROUND EXTERNAL OPENINGS AIR PERMEABILITY & PRESSURE TESTING Limiting air leakage Pressure testing of new dwellings 60 Alternative to pressure testing PROVIDING INFORMATION PART M: ACCESS TO AND USE OF BUILDINGS FOR DISABLED 61 External ramped & stepped approach Accessible level door thresholds into the building External door opening widths Internal passageways/corridors widths & table Internal stairs 62 Accessible switches, sockets, controls etc Provision of a ground floor W/C PART N: SAFETY GLAZING, OPENING & CLEANING 63 Safety glass and glazing Diagram 17: Glazing in windows, partitions, doors, side panels/screens & walls PART P: ELECTRICAL SAFETY 64 Electrical Installations EXTERNAL WORKS- PATHS, DRIVES, PATIO & GARDENS 65 MATERIALS AND WORKMANSHIP 66 ADDITIONAL BUILDING CONTROL SERVICES WE CAN PROVIDE GLOUCESTERSHIRE BUILDING CONTROL DEPARTMENTS CONTACT DETAILS 67 USEFUL NUMBERS OF OTHER AGENCIES OR COMPANIES 6

7 1.0 Engaging a property professional New dwellings are normally complex projects and unless you are experienced in construction you will need to get some professional advice/help from the following: 1. Appointing a suitably qualified and experienced property professional who will prepare drawings and designs for your proposal, obtain the necessary approvals and if required they will also help you to find a suitable builder and manage the project for you. 2. Appointing a specialist company who can offer a one stop shop for new dwellings, they can prepare drawings and designs for your proposal, obtain the necessary approvals and carry out all the necessary construction works to complete the project. 3. Using an experienced builder. 2.0 Obtaining Building Regulations approval The building owner or agent must make a building regulations application & pay a fee for the construction of a new dwelling. All work must comply with the 2010 Building Regulations and the technical design and constructional requirements of the current Approved Documents A to P and Regulation - 7 Materials and Workmanship. The person carrying out the building works is to liaise with and meet the requirements of the LA Building Control/Certifying Body, giving required notices of stages of works as required by the Building Regulations including: Foundation excavations before any concrete is laid Over site covering to ground floors before any concrete is laid Foul & surface water drainage before any pipes are covered over Structural timbers (upper storey floor joists/beams and roof structure before any coverings are fixed Completion of building-prior to occupation There are two methods of making a Building Regulations application as follows: 2.1 Full Plans application This is often thought of as the traditional way of applying for Building Regulations Approval. The building designer will draw up detailed plans and supporting information for the proposed scheme and will send them to us together with a completed application form and the necessary fee which are available to down load from our web site at: We will then check the details and following any necessary consultations and liaisons with the building designer a Building Regulations Approval will be issued. Work can start any time after the application has been received although it is wise to wait until the scheme has had its initial check under the Building Regulations, this usually takes between two and three weeks. Our team of surveyors will liaise with your builder and inspect the work as it progresses on site. When the project is satisfactorily completed a Building Regulations Completion Certificate will be issued showing that the project has been independently inspected and that it complied with the Building Regulations. 2.2 Building Notice application This system is best suited to minor domestic work carried out by a competent builder. Under this scheme no formal Approval of plans is issued and work is approved on site as it progresses. To use the Building Notice process you or your agent will need to submit a completed Building Notice application form together with a site location plan, the required fee, energy assessment and water efficiency calculation. The application forms are available to down load from our web site at: 7

8 Work can commence 48 hours after the notice has been received. When work commences one of our surveyors will meet with your builder to discuss your intentions, to agree how the work should be carried out, agree when the work will need to be inspected and to establish whether any further information will be required e.g. structural calculations or drawings. When the project is satisfactorily completed a Building Regulations Completion Certificate will be issued showing that the project has been independently inspected and that it complied with the Building Regulations. 3.0 Exempt buildings and work Green Houses & agricultural buildings: Buildings used for agriculture or keeping of animals providing no part is used as a dwelling and is more than 1.5 times its height from a building containing sleeping accommodation Temporary buildings: Buildings erected for less than 28 days Ancillary buildings: Buildings used in connection with the sale of buildings or plots on that site, or in connection with a building project or mine/quarry and contains no sleeping accommodation. Small detached buildings (garages, workshops or sheds): A detached single storey building with less than 30m 2 internal floor area, with no sleeping accommodation. If constructed substantially of combustible materials it must be positioned at least one metre from the boundary of its cartilage. Other detached buildings with less than 15m 2 internal floor area, with no sleeping accommodation. (no boundary restrictions if constructed of combustible materials) Conservatory, porch, covered yard/way & carports: A detached single storey building with less than 30m 2 internal floor area, fitted with safety glass in critical locations in compliance with ADN. Existing walls, doors & windows of the building separating the conservatory or porch is to be retained or, if removed are replaced with elements that meet the energy efficiency requirements of ADL1B. The heating system of the dwelling must not be extended into the conservatory or porch. Carports must be open on two sides. 4.0 Competent Person Scheme Certain works can be carried out by an installer who is registered with a Competent Persons Scheme and will not require building regulations approval. Further details of the works covered by a competent persons scheme can be found at: Planning Permission, listed building & conservation area consents Planning permission, listed building/conservation area consents may be required for your proposed development and no works should be commenced until approval has been given by the planning department. If the requirements of the building regulations will unacceptably alter the character or appearance of a historic/listed building/ancient monument or building within a conservation area, then the requirements may be exempt or improved to what is reasonably practical or acceptable and would not increase the risk of deterioration of the building fabric or fittings in consultation with the local planning authorities conservation officer. For any further information, please contact the FODDC duty planning officer on

9 6.0 The Party Wall Act 1996 If the project affects a party wall, you may be required to give your neighbor the required notice under the Party Wall Act. Two months notice in writing is to be given to adjoining owner(s) for the following works to an existing Party Wall: Support of beam Insert DPC through wall Raise wall or cut off projections Demolition and rebuilding Underpinning Insert lead flashings Excavations within 3 meters of an existing structure where the new foundations will go deeper than adjoining foundations, or within 6 meters of an existing structure where the new foundations are within a 45 degree line of the adjoining foundations. In the event of a disagreement, a Party Wall Surveyor may be required to resolve the dispute under the terms of the Party Wall Act. Copies of the Party Wall Act can be obtained from the Council Offices or Construction (Design and Management) Regulations 2007 (CDM) The Construction (Design and Management) Regulations 2007 apply to every construction project. If you are about to undertake construction work, which could include alterations, extensions, routine maintenance, new build or demolitions, then you need to know to what extent these Regulations will apply to you and whether you are a duty holder under these Regulations. With non-domestic* projects expected to last longer than 30 days, or more than 500 man hours, you will require the assistance of an advisor called a CDM Co-ordinator, who should be appointed at the earliest opportunity, before detailed design work is complete. If you are a Client thinking of commissioning work, a Designer appointed to work on a project, or a builder/developer about to undertake work, you should be aware of your responsibilities or duties under CDM *Non-domestic Clients are people who commission building works related to a trade or business, whether for profit or not. This work can be carried out on a domestic property; it is the type of Client that matters, not the type of property. 9

10 8.0 General technical & practical guidance for projects Preparation, protection, access, demolition & ground investigation Demolitions, existing structures to be supported & protected where necessary, any existing sub structures (e.g. foundations and slab etc), taken up & removed off site to a licensed tipping site. Where the demolition of a structure or part of a structure exceeds 50m3, a notice of the proposed demolition should be sent to the local authorities building control department before works commence. Standard format notice is available to down load at our web site: Provide all necessary health and safety requirements including; site security, scaffolding, access ladders, material hoists, temporary protection and working platforms etc which are to be erected, maintained, certificated, dismantled and removed by suitably qualified and insured specialists. All plumbing, drainage, heating, electrical services etc to be carried out by suitably qualified & experience specialists or registered competent persons, tested & appropriate certification issued where required in this specification. Any asbestos/contaminated soil/lead paint is to be inspected & removed by a specialist. Asbestos is to be removed and disposed off site by a specialist licensed contractor as required under the Control of Asbestos Regulations Ground to be prepared for new works as described including location and alteration/modifications to all existing services as necessary, including sealing up, capping off, disconnecting, removing redundant services as necessary. Prior to and during works, the person carrying out the works is to liaise with and meet the requirements of the relevant Service Authorities, including the location and protection of all services as necessary. External paths, drives, patios, walls, fences & gardens etc, to be taken up and relayed/extended as necessary to accommodate the new works as described. All structural timber is to be grade C24, stress graded to BS 4978 and sawn to BS All timber is to be protected on site to minimize moisture content which must not exceed 22%. An initial ground investigation assessment should be carried out including a desk study and walk over survey which should be recorded and evaluated by a suitably qualified and experienced person, and where necessary further basic geotechnical and contamination investigations should be carried out by a suitably qualified and experienced person. Where the initial assessment and basic investigations identify suspected hazards, further detailed investigations and remedial reports are required from a specialist and copy sent to building control and approved before works commence on site. 10

11 Part A: Structure A1: Sub structure Foundations (including retaining walls & basements) Foundations to be constructed at a minimum depth of mm, below the influence of drains, and or surrounding trees on level firm natural undisturbed ground of adequate ground bearing capacity to the approval of the building control surveyor. Strip foundations to be a minimum width of 600mm and thickness of 225mm and trench fill foundations should have a minimum width of 450mm and a minimum 500mm thickness of concrete. The concrete mix should be ST2 or GEN1. Alternative foundation designs, i.e. raft, piles, retaining walls & basement to be designed by a suitably qualified person and approved by building control before works commence on site. Where applicable, a suitable basement tanking system is to be assessed & designed by a tanking specialist suitable for the site conditions & proposed building construction to prevent the passage of moisture into the building, which must be approved by building control before works commence. Retaining walls require 100mm diameter slotted ground water drainage pipe laid around the outside perimeter of any retaining wall at 1:60 gradient and taken to a suitable sized soak away system. Foundations are to be provided centrally positioned under all exterior, party and interior load bearing walls, steps in foundation level should not exceed its thickness and should overlap by twice its thickness. Two layers of B503 mesh reinforcement or stronger are to be provided, one top and bottom with 75mm cover to the foundations in the Forest of Dean mining and Mineral Valuer areas (please contact building control for area details). Walls below DPC level up to 1m deep are to be constructed with two skins of 7N/mm² 100mm or 140mm if over 1m deep concrete blocks 1:3 cement mortar in-filled with concrete to a maximum of 225mm below DPC level. Block and cavity width and wall tie spacing, etc, to be same as the wall above, but with a row of wall ties to support the cavity wall insulation below DPC level. Diagram 1: Stepped foundation detail Foundations should unite at each change in level L S T Minimum overlap L = twice height of step, or thickness of foundation or 300mm, whichever is the greater S should not be greater than T (for trench fill foundations, minimum overlap L = twice height of step or 1metre, whichever is the greater) 11

12 Ground bearing solid concrete floors (worst case U-value suggested U-value 0.13 W/m².k) Topsoil and vegetable matter to be cleared from site and floor to be in filled with minimum 150mm/maximum 600mm clean sand blinded compacted hardcore. A 300um (1200g) continuous polythene DPM/radon barrier is to be lapped & sealed at all joints, laid over sand blinded hardcore & linked to DPC s in walls. Floor & external perimeter edges of floor slab to be insulated with floor grade insulation thickness and type in Table below, provided under a minimum 100mm thick ST2, or Gen1 concrete floor slab with a trowel smooth surface with 25mm up stands to the external walls. A 500g polythene separating layer is to be installed between the concrete slab and insulation if using a foil faced polyurethane/pir type insulation board. Insulation to be omitted and concrete thickness increased in areas where non-load bearing partitions are built off the floor slab. Where area of fill exceeds 600mm the floor is to be suspended as detailed in this guidance. Diagram 2: Typical section through a ground bearing solid concrete floor & foundation (not to scale) All external widows and doors to be double glazed (see options in specification) 100mm minimum width insulation block (see options in specification) Wall grade insulation (see options in specification) 50mm clear cavity if using partial fill cavity wall insulation (see options in specification) Damp proof course and insulated closer DPC 150mm above ground level radon dpc tray sealed with gas proof tape to dpm/radon barrier Stainless steel wall ties and spacings as detailed in specification 100mm minimum width external wall in materials to match existing or as specified in planning permission 25mm wide insulation to prevent cold bridging 65mm thick cement/sand screed (optional) 100mm thick concrete slab Floor grade insulation (see options in specification) 1200g damp proof membrane/radon gas barrier Sand blinded hardcore mechanically compacted in 150mm layers. (floor slab to be suspended where depth of fill exceeds 600mm deep* Back fill cavity with concrete 600 x 200mm concrete strip foundation or trench fill foundation as detailed in specification, to be mm deep depending on sub soil conditions. Actual depth to be agreed on site with building control surveyor. Foundation depths in relation to trees to be in accordance with NHBC tables- contact building control for guidance. 600mm *Note: where full radon protection is require, proprietary radon gas sumps are to be installed in sub structure & connected to a proprietary fan assisted duct system in compliance with Part C of this guidance. Suspended beam & block ground floor (worst case U-value: 0.25-suggested U-value 0.13 W/m².k) Remove top soil & vegetation, apply total weed killer minimum space below underside of floor to be 150mm. PCC beams to be supplied and fixed to beam manufacturers plan layout and details. (copies to be sent to Building Control and approved before works commence on site). Typically for domestic loading and spans pre-stressed beams are 155mm deep X 125mm wide and fixed at 520mm ctrs, minimum bearing 100mm onto DPC course and load bearing walls. All garage floors to be designed suitable for loadings. Clean all beams edges and lay abutting 100mm thick X 225mm wide X 440mm long 3.5kn conc blocks to BS6073 pt.1, wet and grout all joints with 1:4 cement/sand mix. Below non-load bearing parallel partitions provide double beams. 12

13 Sub structure void to be vented on opposing sides to provide cross ventilation using 225 X 150mm proprietary ventilators at 2000mm ctrs, inner ground level to be above external ground levels. Lay 1200g (300 um) visqueen dpm/radon barrier, with 300mm laps double welted and taped at joints and service entry points using Radon gas proof tape, over beam & block floor. Lay floor grade insulation over DPM to the thickness and type as indicated in table below. Lay 500g separating layer over any foil faced polyurethane type insulation board and lay 75mm sand/cement screed over and prepare for floor finishes as required. Diagram 3: Typical section through a suspended beam & block ground floor (not to scale) Double glazed windows as detailed in specification Cavity wall construction as detailed in specification Continuous dpc tray sealed with gas proof tape to dpm 75mm sand/cement screed Damp proof course & insulated closer Weep holes 225 x 75mm grilled air bricks & proprietary telescopic vents through opposing walls at 2.0m ctrs* 75mm min floor grade insulation as table g dpm/radon barried Pcc beam suitable for spans & loadings as beam manf details 100mm dense conc blocks DPC 150mm min above gl dpc under beams 75mm min air void Alternative 1200g DPC basic radon barrier over complete building foot print to comply with NHBC requirements 600mm 75mm concrete blinding layers 600 x 750mm (adjusted to foundation depth)concrete trench fill foundation as detailed in specification, to be mm deep depending on sub soil conditions. Actual depth to be agreed on site with building control surveyor. Foundation depths in relation to trees to be in accordance with NHBC tables- contact building control for guidance. *Note: for full radon protection a radon fan & flue can be connected to the floor vents if required Suspended timber ground floor (worst case U-value suggested U-value 0.13 W/m².k) Remove top soil & vegetation, apply total weed killer & 150mm min thick sand blinded hardcore, lay 100mm min thick un-reinforced concrete oversite (concrete mix should be in accordance with BS 8110, BS 5328, mix type ST2 or GEN1), on 1200g DPM which should extend across cavity as basic Radon protection and positioned to prevent water collection. Allow a ventilated air space at least 75mm from the top of the oversite concrete to the underside of any wall plates and at least 150mm to the underside of the suspended timber floor or insulation. Provide sub floor ventilation using 225 x 75mm grilled air bricks & proprietary telescopic vents through two opposing external walls at 2.0m ctrs to vent all parts of the floor void. Ducts to be sealed using gas proof tap if they pass through the Radon barrier. 13

14 Joists to be supported off proprietary heavy duty galvanized joist hangers. Hangers to be built into new masonry walls or fixed to treated timber wall plate (same size as joists), resin bolted to existing walls at 600mm ctrs using 16mm diam high tensile bolts. Where necessary, floor joists can be supported on treated wall plates & dpc onto masonry honeycombed sleeper walls onto oversite concrete. Floor joists sizes as stated on plans, or table below. Joists to be grade C24 kiln dried floor joists fixed at 400mm ctrs (depth to be increased where necessary to match floor levels). Proprietary galvanized steel strutting to be fixed at mid span for m span and 2 rows at 1/3rd points for spans over 4.5m. Floor to be insulated with floor grade insulation thickness and type in table below, friction fixed between joists. Fix 22mm moisture resistant t & g flooring sheets to BS 5669 type II or II/III laid with long edge across the joists. All joints to positioned over joists, glued & nailed using 55mm X 10g annular ring shank nails. Diagram 4: Typical section through a suspended timber ground floor (not to scale) Double glazed windows as specification Insulated cavity wall construction as Specification Damp proof course & insulated closer Weep holes Dpc tray 225 x 75mm grilled air bricks & proprietary telescopic vents through opposing walls at 2.0m ctrs* 22mm moisture resistant flooring sheets Floor joists as table 4 Galv hangers built into walls or fixed to wall plates resin bolted to walls Insulation as table 1 fixed between joists & supported on battens fixed to joists DPC 150mm min above gl w/plate on dpc honey combe sleeper wall 75mm min 150mm min 1200g DPC basic radon barrier over complete building foot print 600mm 100mm oversite concrete slab Blinded hardcore 600 x 750mm (adjusted to foundation depth)concrete trench fill foundation as detailed in specification, to be mm deep depending on sub soil conditions. Actual depth to be agreed on site with building control surveyor. Foundation depths in relation to trees to be in accordance with NHBC tables- contact building control for guidance. *Note: for full radon protection a radon fan & flue can be connected to the floor vents if required Table 1: Ground floor & suspended ground floor insulation requirements Suggested U-value: 0.13 W/m².k Insulation Type Minimum Thickness Required Kingspan Kooltherm K3 or 125mm (floor P/A ratio of 0.5) other approved with K value of Alternatives TBA 14

15 Garage concrete floor Power floated 150 mm thick concrete slab (concrete mix should be in accordance with BS 8110, BS 5328, mix type ST2 or GEN1), with 1 layer A252 steel mesh positioned mid span of slab on 1200g visqueen dpm/radon barrier on sand blinding on min. 150 well consolidated sulphate free clean hardcore.(no reclaimed demolished material is permitted). 1:80 fall on floor from back of garage to front garage door, floor to be thickened to 300mm at garage entrance. Provide 25mm polystyrene compressible clay board to perimeter of walls. If hardcore is more than 600mm deep- slab to be reinforced further, to NHBC/LA/Engineers requirements. 100mm thick masonry step down into garage to be provided at doorways. Diagram 5: Typical section through a garage floor & foundation (not to scale) Painted render on 100mm dense conc block or bricks Piers built off fnds & extend full height of walls & gables 150mm thick concrete slab 1 layer A 252 steel mesh mid span 1200g damp proof membrane Slab thickened at doorway DPC 600 x 225mm concrete strip foundation or trench fill foundation as detailed in specification, mm deep as agreed on site with building control surveyor Sand blinded hardcore mechanically compacted in 150mm layers. (floor slab to be suspended where depth of fill exceeds 600mm deep) 600mm 15

16 A2: Superstructure External walls Cavity walls (worst case U-value suggested U-value 0.18 W/m².k) Walls to consist of either approved reconstituted stone facings,100mm tooled flush jointed brickwork or 2 coat rendered 100mm dense concrete blockwork external skin dependant upon exposure with a 100mm thick lightweight high performance 2.8N/mm² insulation block with either a 13mm lightweight plaster finish or 12.5mm plasterboard skimmed drylining. Ensure all gaps & all voids are sealed to prevent any air leakage. Where required external natural stone facings to be tied to external blockwork with wall ties as detailed below and foundation widths increased by 150mm. Walls to be built with 1:1:6 cement mortar and tied with BBA approved 275mm long Ancon ST1 stainless steel wall ties or other approved double dip type tie in compliance with BS 5628 & BS EN 845-1, built 75mm min into each wall at maximum spacing in compliance with wall tie manufacturers details and typically at 600mm max horizontal, 450mm max vertical and 225mm max at reveals, verges and closings for cavities up to 125mm wide. For cavity widths of 100mm use 250mm long ties- see table below*. Cavity width and insulation details to be constructed as Table 2 below to achieve a U value of not more than 0.28 W/m².k. Wall insulation to be continuous with roof insulation level and taken below floor insulation levels as manufacturer s details. Table 2: Insulation requirements for external cavity walls with 100mm dense Brick or rendered block external skin & internal plaster/dry lining plaster finish Clear cavity width required Insulation type & Minimum thickness Overall cavity width required Internal Block Type & Thickness Partial cavity fill 50mm 125mm* 75 mm Kingspan Kooltherm K8 or Other approved with K value of mm high performance insulation block (k value 0.15 or less Alternatives TBA * Cavities can be reduced to 100mm in compliance with insulation manufacturers details, subject to any building warranty provider requiring a minimum clear cavity of 50mm Semi Exposed Walls (worst case U-value suggested U-value 0.18 W/m².k) Semi exposed walls to unheated rooms such as garages etc, to be constructed and insulated as external walls or constructed of 2.8/mm² 100mm solid dense concrete blocks with 50 X 125mm deep timber studs or proprietary metal stud partition wall system with insulation friction fixed between vertical studs (as detailed in table below), finished with 12.5mm vapour checked plaster board (or 500g polythene vapour check) Table 2.1: Insulation requirements to semi exposed walls Insulation Type Minimum Thickness mm Kingspan Kooltherm K12 or other 120 mm approved with a K value of Alternatives TBA 16

17 External timber framed walls with separate brick or block finish (worst case U-value suggested U-value 0.18 W/m².k) Design, manufacture, supply, erection & certification of the complete timber frame including roof, walls, lintels & floors etc to be carried out by a specialist timber frame manufacturers in compliance with structural engineers details and calculations. Shell of building to be air sealed and fitted with protective coverings, and measures to prevent condensation and ingress of moisture into the building. All details to be approved by building control before works commence on site. Moisture content of timber should not exceed 20% and to be kiln dried & grade C24, workmanship to comply to BS 8000:5. All timber to be treated using an approved system and all fixings to be stainless steel or other approved. Timber framed walls to be insulated with 120mm thick Kingspan Kooltherm K12 thermal insulation board friction fixed between studs, with12.5mm vapour checked plaster board fixed to studs and 3mm skim coat of finishing plaster. All junctions to have water tight construction, seal all perimeter joints with tape internally and with silicon sealant externally. External wall to be approved brick/reconstituted stone/ painted sand & cement render (render to BS 5262), on 100mm medium dense external concrete as indicated on plan layouts. Masonry walls/mortar/render specifications are contained elsewhere in this guidance. External masonry skin to be tied to timber frame studs (not the sheathing) using BBA approved proprietary flexible stainless steel or other approved wall ties in compliance with BS 5628 & BS EN 845-1, at ctrs not exceeding 600mm horizontally and 450mm vertically and 225mm max at reveals. Wall ties should be embedded in mortar to a minimum depth of 75mm with a slight fall towards the external brickwork. Provide proprietary flexible water and fire resistant cavity barriers at eaves level, gable end walls and vertically at junctions with separating walls & horizontally at separating walls with continuous dpc tray over, installed in compliance with manufacturers details. Ensure all gaps & all voids are sealed to prevent any air leakage. 17

18 External timber framed walls with render finish (worst case U-value suggested U-value 0.18 W/m².k) Render finish (to BS 5262) applied in 3 coats at least 16mm 20mm thick overall to render lath. First & second coats 1:3 (cement : sand with plasticizer). final coat 1:6 (cement : sand with plasticizer) proportions by volume. Render should be finished onto an approved durable render stop, angle beads or jointing sections- stainless steel or other approved using drilled or shot fired fixings only. Stainless steel render lath fixed (using stainless steel staples) to vertical studs at 600mm max ctrs. laps wired together at 150mm ctrs. (Mesh to be backed by a water resistant membrane) & fixed to: Treated battens - 25 x 50mm preservative treated battens fixed vertically to studs at max 600mm ctrs using 75mm long hot dipped galv or stainless steel annular ring nails, fixed to: Breathable membrane- Tyvek or similar approved suitable for timber framed walls to current BBA certification, fixed to: External quality plywood- 12mm thick marine ply wood (or other approved) fixed to: Treated timber frame constructed using: 125/150mm x 50mm head & sole plates and vertical studs (including 2 rows noggins) at 400mm ctrs, to s/engineers details & calculations, with 120mm thick Kingspan Kooltherm K12 thermal insulation board friction fixed between studs, with12.5mm vapour checked plaster board fixed to internal face of studs and finished with 3mm skim coat of finishing plaster. All junctions to have water tight construction, seal all perimeter joints with tape internally and with silicon sealant externally. Ensure all gaps & all voids are sealed to prevent any air leakage. Diagram 6: Typical section through external timber framed walls with painted render finish (not to scale) Masonry paint finish 16-20mm thick render finish Stainless steel render lath with water resistant membrane to stop render filling cavity 25 x 38mm treated timber battens at 600mm ctrs fixed vertically to form drained cavirty TYVEK or similar breathable membrane 12mm external quality plywood or other approved Stainless steel stop bead forming drip Insect proof mesh (non rust) 125/150 x 50mm treated stud at 400mm ctrs Thermal insulation as guidance details 13mm vapour checked plaster board & skim finish 125/150 x 50mm sole plates fixed to base Construction details as guidance 18

19 External timber framed walls with cladding finish (worst case U-value suggested U-value 0.18 W/m².k) Approved timber/upvc weatherboarding/vertical wall tiling fixed with proprietary rust resistant fixings to: 50 X 25mm treated battens/counter battens at 400mm ctrs fixed to: Tyvek vapour permeable membrane suitable for timber framed walls & fixed as manufacturers details to: 12mm WPB ext quality plywood sheathing (joints covered by dpc/battens) fixed to 125/150mm x 50mm head & sole plates and vertical studs (including 2 rows noggins) at 400mm ctrs, to s/engineers details & calculations. Studs exceeding 2.5m high to be designed by Structural Engineer. 120mm thick Kingspan Kooltherm K12 thermal insulation board friction fixed between studs with 12.5mm vapour checked plaster board fixed to internal face of studs and finished with 3mm skim coat of finishing plaster. All junctions to have water tight construction & seal all perimeter joints with tape internally and with silicon sealant externally. Ensure all gaps & all voids are sealed to prevent any air leakage. Diagram 7: Typical section through external timber framed walls with upvc/timber weather board finish (not to scale) Upvc weatherboarding/vertical wall tiling fixed with proprietary rust resistant fixings 25 x 38mm treated timber battens at 600mm ctrs fixed vertically to form drained cavirty TYVEK or similar breathable membrane 12mm external quality plywood or other approved Cladding stop fillet & insect proof mesh 125/150 x 50mm treated stud at 400mm ctrs Thermal insulation as guidance details 13mm vapour checked plaster board & skim finish 125/150 x 50mm soleplates fixed to base Construction details as guidance Detached garage with SINGLE SKIN external walls External walls to be as elevation plans details using: 100mm brick/reconstituted stone, matching painted sand & cement render (render to BS 5262), on 100mm dense concrete blocks with 100 X 400mm piers with fair face finish internally at maximum 3.0m ctrs. Floor area exceeding 36m2 will require structural engineers details & calculations to confirm stability of the structure. Eaves level should not exceed 3.0m and ridge height should not exceed 3.6m without structural engineers details & calculations to confirm stability of the structure. Size and proportion of the garage to comply with paragraph 2C38, and the size and location of openings in building to comply with Diagram 18/19/20 of ADA, & briefly as follows: o Major openings to be restricted to one wall only (normally the front entrance garage door(s). Their aggregate width should not exceed 5.0m and their height should not exceed 2.1m. 19

20 o There should be no other openings within 2.0m of a wall containing a major opening. o The aggregate size of openings in a wall not containing a major opening should not exceed 2.4m2 o There should not be more than one opening between piers o Unless there is a corner pier, the distance from a window or a door to a corner should not be less than 390mm. o Isolated central columns between doorways (where applicable) to be 325 x 325mm min. o Openings other than those stated above will require structural engineers details & calculations to confirm structural stability Mortar mix to be 1:1:5-6 or as required by the stone/brick/block manufacturer. Diagram 8: Design criteria for small detached single storey garages or similar (not to scale) Sizes & proportions of building to comply with Par 2C38 & diagrams 18/19/20 of ADA 390mm min to opening piers at 3000mm maximum ctrs Note: The garage floor area should not exceed 36m2 Piers to be built off the foundations & extend full height of all walls & gables Maximum roof slope to be 40 degrees, wall plates & gable ends to be strapped with galvanized strapped at 2.0m ctrs 100mm min dense conc blocks or bricks 100mm min 390mm min to opening Maximum height to eaves 3.0m & 3.6m to ridge & should not exceed 9.0m in length or width Piers to be 440mm min Note: If any of the above are exceeded, the building is to be constructed in compliance with design details & calculations from a suitably qualified person which must be approved by building control before works commence No other openings within this 2.0m zone 325mm min 325mm min Pier 215mm min 327mm min Plan view of garage 20

21 Wall abutments Vertical junctions of new and old walls to be secured with proprietary profiled stainless steel metal crocodile type system with a continuous cavity fixed with DPC and pointed with flexible mastic as manufacturer s details. Lintels & weep holes Proprietary manufactured lintels to current British Standards/Euro codes (including specialist lintels supporting stone facings) are to be provided over all structural openings. The positions, types, sizes, end bearings etc of lintels must be in compliance with the lintel manufacturers standard tables suitable for the proposed loadings and clear spans. Stop end and dpc trays to be provided above all externally located lintels in compliance with lintel manufacturer s details. Weep holes at 450mm centers with at least two per opening. Structural columns/beams etc Non proprietary beams/columns including pad stone to be fabricated and installed in compliance with details and structural calculations carried out by a suitably qualified and experienced person, which must be approved by building control before works commence on site. Dpc trays to be provided above all externally located beams. Weep holes at 450mm centers with at least two per opening. Expansion joints External walls should be provided with adequately spaced and sized expansion joints, in accordance with masonry manufactures details with adequate tying to each side of the joint and leaf of masonry using stainless steel wall ties (normally at each block height) and sealed externally with a proprietary flexible mastic sealant. (Normally expansion joints are 10-12mm wide and spaced vertically at max 12m ctrs in brick work & 6m ctrs in block work) Strapping and restraint Walls to be restrained at intermediate floor, ceiling and gable walls by the provision of 30 x 5 x 1000mm lateral restraint straps or other approved in compliance with BS EN 845-1, at maximum 2m centers carried across at least 3 joists or rafters, etc, with a minimum of 38mm wide x ¾ depth noggins. Cavity Closers Proprietary acoustic/insulated fire stop cavity closers, or similar are to be provided to all cavity openings/closings, tops of walls and junctions with other properties. A3: Separating walls & floors ( Also see relevant sections in ADE) Masonry party walls separating dwellings (U-value 0.2 W/m 2.K) Party walls to be constructed of 2 skins of plastered 100mm dense concrete block with a clear 50mm cavity and BBA approved wall ties spaced as external walls up to the underside of the roof and fire stopped with mineral wool or an approved proprietary intumescent product to achieve a minimum 45dB value for airborne sound insulation.the party wall is to be bonded/tied to the inner leaf and the junction of cavities are to be fire stopped throughout its length with a proprietary acoustic/ insulated fire stop cavity closer and all other vertical and horizontal cavities are to be closed in a similar manner to provide effective edge sealing and a U-valueof 0.2 W/m 2.K. 21

22 Timber frame party walls separating buildings (U-value 0.2 W/m 2.K) Timber framed stud walls to achieve a minimum 45 db value for airborne sound insulation and constructed with 100 x 50mm sawn timber studs at 400mm ctrs with head & sole plates, with 2x 50mm thick layers ROCKWOOL RWA 45 mineral wool friction fixed between studs, and 2x 15mm thick layers of LAFARGE db check wall board fixed both sides of stud (joints staggered) with skim coat of plaster finish- as wall board manufacturers details. No electrical fittings to be fixed into/onto party walls & all gaps to be fire sealed & smoke stopped to the full height and width of the party wall and upto the underside of the roof coverings using mineral wool (not glass wool) or an approved proprietary intumescent product to provide effective edge sealing and a U value of 0.2 W/m 2.K. Party floors separating buildings Outside the scope of this guidance- see relevant sections in ADE Sound testing requirements Pre completion sound testing is required for all new/upgraded party walls/floors which must be carried out by a suitably qualified person or specialist to demonstrate compliance with Approved Document E and copy of test results sent to building control. A4: Additional provisions for 3 storey buildings Compressive strength of masonry units The compressive strength of bricks and blocks used in three storey construction is as follows: (i) Outer leaf of cavity wall Blocks & bricks to be 7N/mm2 from foundation level upto the underside of the structural roof. (ii) Inner leaf of cavity wall Blocks to be 7N/mm2 from foundation level upto the underside of the first floor level. Blocks above this level upto the underside of the structural roof can be 2.8N/mm2. (iii) Internal walls Blocks to be 7N/mm2 and 140mm thick upto the underside of the first floor level. Blocks above this level upto the underside of the structural roof to be 2.8N/mm2. 22

23 A5: Internal partitions Internal load bearing masonry partitions Internal load bearing walls to be minimum100mm thick 7N/mm2 dense concrete blocks (actual wall thickness must not be less than the wall it supports above), built off suitable foundations (as detailed above), with pre-cast concrete/proprietary steel lintels over openings (in compliance with lintel manufacturers span tables) and walls bonded/tied to external or party walls with proprietary ties each course and restrained by floor or ceiling joists/trusses. Internal load bearing timber stud partitions Load bearing timber stud partitions and non-proprietary lintels to be in compliance with details and calculations by a suitably qualified and experienced person, which must be approved by building control before works commence on site. Internal masonry non-load bearing partitions Internal non-load bearing partitions to be constructed of 100mm 2.8/mm² dense concrete blocks built off a thickened floor slab and tied/block bonded to all internal and external walls at maximum 225mm centers with either a plaster or dry lined finish as the external walls. Internal timber studwork non-load bearing partitions Non-load bearing stud partitions are to be constructed of 100 x 50mm soft wood with head and sole plates and intermediate noggins fixed at 600mm with a minimum of 25 mm of 10Kg/m 3 proprietary sound insulation quilt suspended in the stud and finished with 15 mm plasterboard and skim both sides. 23

24 A6: Intermediate upper floor(s) Floor to be constructed of kiln dried structural grade timber joists with sizes and spacing suitable for the proposed clear span as annotated on the drawing or in compliance with Tables below. Joists to be supported by heavy-duty proprietary galvanized metal restraint joist hangers built into walls or fixed to treated timber wall plates (same sizes as joists) resin bolted to walls at 600mm centers using approved 16mm diameter stainless steel fixings. Alternatively, joists can be built into walls using approved proprietary sealed joist caps. Joists are to be doubled up and bolted together for trimmers, under partitions and baths. Ensure all gaps & all voids are sealed to prevent any air leakage. Floor void between joists to be insulated with a minimum thickness of 100 mm of 10Kg/m³ proprietary sound insulation quilt, ceiling to be a minimum 15mm plasterboard and skim and floor joist covering to be a minimum of 20mm softwood tongue and groove softwood boards or moisture resistant particle/chipboard to give overall 30 minutes fire resistance. Floor joists to be provided with 1 row of 38 x ¾ depth solid strutting at ends between joist hangers or proprietary galvanized struts to BS EN fixed as manufacturers details, at mid span for m spans and 2 rows at ¹/3 points for spans over 4.5m. Table 3: Spans for Common Domestic Floor Joist Sizes (Strength Class C24) Size of joist Breadth X Depth Spacing of joist (mm) (mm) (mm) Maximum clear span (m) Table 4: Spans for Common Trimmer Joist supporting Trimmed Joists (Strength Class C24) Length of trimmed joists (m) Size of trimmer (mm) Clear span of trimmer joist (m) supporting 2 x 47 x x 47 x x 47 x x 47 x x 75 x 220 trimmed joists Table 5: Spans for Common Trimming Joist supporting Trimmer Joist (Strength Class C24) Length of trimmer joist (m) max Size of trimming joist Clear span of trimming joist (m) supporting (mm) 2 x 47 x x 47 x x 47 x x 47 x x 75 x 220 trimmer joist

25 Sound insulation to floors within the dwelling Intermediate floors to be provided with sound insulation as described in the relevant floor section in this document. SVP pipe boxing SVP pipe boxing to consist of soft wood framing, 2 layers of 15mm plasterboard and skim and void filled with mineral wall quilt for sound insulation and fire/smoke stopping. Boxing to be continuously carried up to roof space for soil and vent pipe and provided with air grills where an air admittance valve is used. Ensure all gaps & all voids are sealed to prevent any air leakage. Exposed intermediate upper floors Semi exposed intermediate timber floors over unheated areas such as garages, porches, walkways, and canopy s to be insulated with the following minimum thickness and types of insulations to achieve a U-value0.22w/m².k as in Table 6 below. Where the construction is open to the environment a vapour barrier and proprietary external mineral fiber or similar 30 minute fire and moisture resistant boarding is to be applied to the underside of the floor. Diagram 9: Typical section through an upper floor (not to scale) Double glazed window bedrooms/ inner rooms to be fitted with openings suitable for escape as detailed in the specification 100mm minimum width insulation block (see options in specification) Wall grade insulation (see options in specification) 50mm clear cavity if using partial fill cavity wall insulation (see options in specification) Wall ties and spacings as detailed in specification 100mm minimum width external wall in materials to match existing or as specified in planning permission Proprietary insulated steel lintels (with dpc trays and stop ends) suitable for clear spans and loadings in compliance with lintel manufactures standard tables Damp proof course and insulated closer Galvanized steel straps at 2m ctrs built into cavity and fixed over 3 joists with noggins Floor joists doubled up under partition walls & baths Sound insulated plaster board achieving 30 minutes fire resistance Sound insulated stud partition 22mm t & g moisture resistant floor boarding Strutting between joist (see specification for spacings) Floor joists (see construction details and table in specification for sizes of joists suitable for clear spans) Sound insulation quilt as specification 100mm dense concrete partitions precast concrete/proprieteray steel lintols, sizes suitable for clear spans as manufactures standard tables Table 6: Insulation requirements to exposed intermediate floors (worst case U-value 0.25-suggested U-value 0.13 W/m².k) Insulation Type Minimum Thickness Required Kingspan Kooltherm K3 or 125mm (floor P/A ratio of 0.5) other approved with K value of Alternatives TBA 25

26 A7: Pitched roofs Pitched roof coverings Roof covering to consist of slate or tile and associated capping, verge/eaves details fixed in accordance with manufacturer s details for pitch and exposure as detailed on the drawings. Cladding to be fixed to a minimum 25 x 50mm treated timber batten or to manufacturer s directions and roof timbers to be overlaid with un-tearable breathable/non breathable roof felt underlay to BS 747 or relevant BBA certificate. Roof to be formed from kiln-dried stress graded timbers sized, spacing, spans, bracing and fixings as detailed on the drawing or tables below. Alternatively, the roof may be formed from proprietary prefabricated manufactured trusses/attic trusses and bracing to BS 5268 but both with a foil backed 12.5mm plasterboard and skim ceiling finish. Pitched roof structure Roof to be constructed using either manufactured roof trusses or a cut roof as follows: Roof trusses (including attic & girder trusses) Roof to be constructed using specialist designed and manufactured trusses (or Attic trusses where forming room in the 600ctrs (max) to BS 5268: A2 94. Trusses to be fixed and braced strictly in accordance with manufacturers details and mechanically fixed to 100 x 50mm sw treated wall plates via galvanized steel truss clips. Reinforced concrete pad stoned required to support girder trusses to details and calculations by a suitably qualified person. The person carry out the building work is to check and confirm the actual roof pitch to the truss manufacturer prior to placing an order. Details of trusses to be prepared by specialist designer/manufacturer, submitted and approved by building control prior to commencing roof construction. Cut roof construction Roof to be constructed using kiln dried stress graded timber. Rafters, ceiling joists, purlin, hanger and binder sizes as stated on tables below or see TRADA Span Tablessuitable for the proposed clear spans and all properly fixed together using approved fixings. Where the ceiling joists are raised above wall plate level they must be fixed within the bottom third of the rafter using 12mm diameter high tensile bolts and steel toothed connectors to connect each rafter and ceiling joist to prevent possible roof spread. Joists raised above this level are to be designed by a suitably qualified person and approved by building control before works commence. Struts & braces to be 100 X 50mm, hips to be splayed rafter depth + 25mm (under 30 degree pitch the hips are to be designed by a suitably qualified person), lay-boards to be the splayed rafter depth + 25mm X 32mm thick, ridges to be splayed rafter depth + 25mm, all valleys beams are to be designed by a suitably qualified person, wall plates to be 100 x 50 fixed to inner skin of cavity wall using galvanized strapping as detailed below. Hip rafters to have 100 X 75mm angle ties connected across wall plates in housed joints at corners of roof & hip irons screwed to hip rafters. Soffits, fascias and barge boards etc to match the existing or in UPVC to BS 4576, fixed in compliance with manufacturers details. 26

27 Allow for all necessary alteration/modification of any existing adjoining roof as required to enable the proper completion of the works and in agreement with building control. Allow for building in as work proceeds or insertion of proprietary stepped/cavity tray dpc to follow line of new roof 150mm above all roof/wall abutments as necessary using code 5 lead flashings. Tie new roof into the existing, alter/modify/renew existing roof coverings and form a weather tight structure. Fix 12.5mm foil backed plasterboard (joints staggered) and 5mm skim coat of finishing plaster to the underside of all ceilings using galvanized plasterboard nails. Roof pitch to (single storey) single skin buildings with walls 100mm thick should not exceed 40 degrees without structural engineers details & calculations to confirm stability of the structure. Cut roofs over 40 are to be braced to BS Diagram 10: Typical section through a pitched roof (not to scale) Roof slates/tiles to match existing or as stated in planning permission fixed as manufacturers details and suitable for the pitch Breathable or non breathable roofing felt fixed as manufacturers details 25 x 50mm treated battens at a guage to suit coverings Rafters (see construction details and table in specification for sizes of rafters suitable for clear spans) Ceiling joists (see construction details and table in specification for ceiling joist sizes suitable for clear spans Rain water gutter Facia/soffit boards Eaves ventilation equal to a continuous 10mm air gap with insect screen (may not be required with certain breathable roof membranes) Wall plates (strapped at 2.0m ctrs) Continuous insulation Sound insulated stud partition as detailed in specification NOTE: Proprietary high level roof vents to be installed where insulation follows slope of roof- equal to a continuous 5mm air gap with insect screen Ridge tiles to match roof coverings Ridge board (see specification for details) Hangers to support hangers if additional support is required to ceiling joists (contact building control for details) Binders to support ceiling joists if they require additional support (contact building control for details) Roof insulation (see options in specification Galvanized steel strapping at 2m ctrs built into cavity and fixed over 3 rafters with noggins as detailed in specification Vapour checked plaster board Double glazed window bedrooms/ inner rooms to be fitted with openings suitable for escape as detailed in the specification Proprietary insulated steel lintels suitable for spans and loadings in compliance with lintel manufactures standard tables Table 7: Spans for Common Domestic Timber Rafter Sizes at 400mm spacing (Strength Class C24) Slope of Roof (degrees) Size of Rafter Maximum clear span (m) Breadth X Depth (mm)

28 Table 8: Spans for Common Domestic Timber Ceiling Joist Sizes at 400mm spacing (Strength Class C24) Size of Ceiling Joist Maximum clear span (m) Breadth X Depth (mm) Table 9: Spans for Common Domestic Timber Purlin Sizes (Strength Class C24) Slope of Roof (degrees) Size of Purlin Breadth X Depth (mm) Spacing of Purlins (mm) Maximum clear span (m) Table 10: Permissible Clear Spans for Common Ceiling Binders Sizes (Strength Class C24) Size of Binder Breadth X Depth (mm) Maximum clear span (m) Spacing of Binders (mm) Roof restraint Roof and walls to be provided with lateral restraint straps across at least 3 timbers as noted in wall section at ceiling, wall plate and verge levels with 30 x 5mm x 1m galvanized metal straps or other approved to BSEN at maximum 2m centers. Roof insulation Insulation to be fixed to manufactures details and must be continuous with the wall insulation but stopped back at eaves or at junctions with rafters to allow a 50mm air gap in ventilated cold roofs. Table 11: Insulation laid horizontally between and over ceiling joists (worst case U-value 0.20-suggested U-value 0.13 W/m².k) Product K -Value Position in roof Crown Wool & Rock-wool Roll mm between joists & 200mm laid across joists Alternatives TBA 28

29 Table 12: Insulation fixed between/under rafters (worst case U-value suggested U-value 0.13 W/m².k) Product K -Value Position in roof Kingspan Kooltherm K mm friction fixed between rafters* & Kingspan Kooltherm K mm fixed under rafters Or other approved with a K value of Alternatives TBA * Where rafters are only 100mm deep, battens should be provided to their underside to maintain a 50mm air gap above the insulation where a non breathable roofing felt is used or battened to allow a 25mm sag in felt if using a breathable roofing membrane as the manufacturers details. Table 13: Insulation fixed between/over rafters (worst case U-value suggested U-value 0.13 W/m².k) Product K -Value Position in roof Kingspan Kooltherm K mm fixed between rafters & 80mm fixed over rafters Or other approved with a K value of Alternatives TBA 25 x 50mm counter battens to be fixed over insulation to allow for sag in breathable roofing membrane as manufacturers details Diagram 11: Typical roof valley detail (not to scale) 200mm min Roof coverings & roof structure as specification & section details 125mm min Rafter birds mouthed over 150 x 50mm wall plate (wall plated strapped at 2.0m ctrs Pcc pad stone or dense blockwork Breathable roofing membrane lapped over lead & forming drip Tiling fillet Code 5 lead lined gutter- lead sizes, drips & welted joints etc to the Lead Development association details 25mm treated gutter board fixed to: 50 x 50mm treated timber gutter bearer 29

30 Diagram 12: Typical section through a dormer roof (not to scale) Roof slates/tiles to match existing or as stated in planning permission fixed as manufacturers details and suitable for the pitch 25 x 50mm treated battens at a guage to suit coverings Breathable or non breathable roofing felt fixed as manufacturers details Ridge board as specification Rafters (see construction details and table in specification for sizes of rafters suitable for clear spans) Trimming joists as spec Rain water gutter, facia/soffit boards etc as spec Eaves ventilation equal to a continuous 10mm air gap with insect screen (may not be required with certain breathable roof membranes) 13mm vapour checked plaster board & skim Ceiling joists (see construction details and table in specification for ceiling joist sizes suitable for clear spans Insulation deatils as tables in specification Dormer walls constructed with painted renders or cladding on insulated timber frame as spec details Code 5 lead flashing & valleys Dormer roof supported on rafters doubled up & bolted together See main roof for construction details Ventilation to pitched roofs Roof insulation to be continuous with the wall insulation but stopped back at eaves or at junctions with rafters to allow a 50mm air gap. Cross ventilation to be provided by a proprietary eaves ventilation strip equivalent to a 25mm continuous gap at eaves level with insect grill. Alternatively, where cross ventilation is not possible such as mono pitch, coved ceiling or room in the roof provide additional ridge/high level ventilation equivalent to a 5mm gap in the form of proprietary vent tiles spaced in accordance with manufacturer s details. Ventilation to the roof space may be omitted, only if a proprietary BBA or similar approved breathable roof membrane, with minimum 25mm thick treated vertical counter battens and proprietary eaves carrier system is used. Breathable roof membranes & proprietary roof vents must always be installed as manufacturers details (note: some breathable membranes may also require additional roof ventilation) 30

31 A8: Flat roof construction Flat roof to be carried out as detailed on the drawings. Moisture content of timber should not exceed 20% and to be kiln dried & grade C24. Workmanship to comply to BS 8000:4. All fixings to be proprietary stainless steel or galvanized steel. Waterproof covering to be either: 3 layers of high performance felt (hot bonded together with bitumen) to a current BBA Certificate in compliance with BS8217 Single layer system with a current BBA or WIMLAS Certificate Glass reinforced plastic (GRP) system with a current BBA or other approved accreditation Lead sheet fixed in compliance with the Lead Development Associations guide to good practice Mastic asphalt fixed in compliance with the Mastic Asphalt Councils technical guides & specifications Waterproof covering to be laid in compliance with manufacturers details by flat roofing specialist onto separating layer over roof insulation layer in compliance with below to form a warm roof (or alternatively insulation fixed between/under joists in compliance with Table below forming a cold roof ) fixed to, 22mm external quality plywood decking or similar approved laid to 1:60/80 minimum gradient using firing strips at spacing to match joists, fixed onto timber flat roof joists constructed of kiln dried structural grade timber with sizes and spacing suitable for the proposed clear span as annotated on the drawing or in compliance with Table below or see TRADA Span Tables. Flat roof to have a surface finish of bitumen bedded stone chippings covering the whole surface to a depth of 13mm to achieve a class AA (or B (t4) European class) fire rated designation for surface spread of flame. Restrain flat roof to external walls by the provision of 30 x 5 x 1000mm lateral restraint straps at maximum 2000mm centers fixed to 100 x 50mm wall plates and internal wall faces Flat roof insulation to be in compliance with tables below. Flat roof insulation is to be continuous with the wall insulation but stopped back to allow a continuous 50mm air gap above the insulation in ventilated cold decks. Cross ventilation to be provided on opposing sides by a proprietary eaves ventilation strip equivalent to a 25mm continuous gap at eaves level with insect grill. Note: Warm roof applications i.e. insulation above the structural deck do not require ventilation. The design, workmanship & selection of materials should comply with Model Specification Sheet P.L.1 Built-Up Roofing: Plywood Deck, published by The British Flat Roofing Council. Metallic roof trims to be of non-corrodible material & resistant to sunlight & not fixed through the water proof covering. All timber to be treated using CCA vacuum/pressure or O/S double vacuum to BS 5268:5, including all cut ends of timber etc 300mm of any joint. All flat roofing works to be carried out by a specialist flat roofing contractor and all materials etc to be fitted in compliance with manufacturer s details. Work should not be carried out during wet weather or when the deck has not fully dried out. A 500g vapour control barrier is required on the underside of the roof below the insulation level. Fix 12.5mm foil backed plasterboard (joints staggered) and 5mm skim coat of finishing plaster to the underside of all ceilings using galvanized plasterboard nails. 31

32 Table 14: Spans for Common Flat Roof Joist Sizes (Strength Class C24) (Access for maintenance and repairs only) Size of joist Breadth x Depth Spacing of joist (mm) (mm) Maximum clear span (m) Table 15: Insulation Fixed Between/Under Flat Roof Joists (Vented cold roof-worst case U-value suggested U-value 0.13 W/m².k) Product K -Value Position in roof Kingspan K7 Kingspan K18 Or other approved with a K value of mm between joists 32.5mm fixed under joists Note: The joist depth must be sufficient to maintain a 50mm air gap above the insulation and cross ventilation to be provided on opposing sides by a proprietary ventilation strip equivalent to a 25mm continuous gap at eaves level with insect grill for ventilation of the roof space. Table 16: Insulation Fixed above Flat Roof Joists (Non vented warm roof worst case U-value 0.20-suggested U-value 0.13 W/m².k) Product K -Value Insulation fixed above deck Kingspan Thermaroof mm fixed above deck in a single layer Or other approved with a K value of Alternatives TBA 32

33 Diagram 13: Typical section through a flat (cold) roof (not to scale) 13mm diam stone chippings bedded in hot bitumen Water proof coverings applied by flat roofing specialist as spec. External quality structural decking Firing strips at 1:60 min gradient 50mm min air gap Thermal insulation fixed above or below structural decking as guidance tables 1:60/80 gradient Plasterboard with vapour check Welted drip 25mm continuous air gap with insect screen wall plate & strapping as spec details Cavity wall as spec details Flat roof joist sizes and spacing as spec tables Proprietary steel box beam as manf details suitable for clear span or timber lintel to s/engineers details & calculations to suit clear spans of openings Note: if insulation is fixed above the structural deck (forming a warm roof) the above ventilation details can be omitted Welted drip Rain water gutters, facia/ barge board 25mm continuous air gap with insect screen Valleys and lead work Lead work, flashing, soakers, valleys and gutters, etc, to be formed from Code 5 lead sheet and fully supported on treated valley boards, etc, and to have a minimum 150mm lap joints, dressed 200mm under tiles, etc, and not to be fixed in lengths exceeding 1.5m and to be fixed in accordance with the roof cladding manufacturers and the Lead Development Association recommendations. Lofts hatches, doors & Light wells to roof spaces All hatches, doors and light wells in the roof space to be insulated to the same standard as the roof, draft stripped and positively fixed. All hatches to be accessible. 33

34 Part B: Fire safety & means of escape Smoke /heat alarms All floors to be provided with mains operated interconnected fire detection and fire alarm system to BS 5446 & installed in accordance with the relevant recommendations of BS : 2004 to at least a Grade D Category LD3 standard. Self contained mains operated smoke alarms (heat alarms installed in kitchens if open to stairway) with battery back up to be fixed at ceiling level in all circulation areas at each storey level, within 7.5m of all doors to habitable rooms. Means of escape windows Means of escape windows to be fitted with proprietary hinges to open to the minimum required clear width of 450mm. Escape windows must have minimum clear opening casement dimensions of 0.33m² and 450mm (typically 450mm wide x 750mm high), located within mm above floor level to all bedrooms and habitable rooms at 1st floor level and inner habitable rooms on the ground floor. Windows above the ground floor storey and within 800mm of floor level are to be provided with containment/ guarding/ proprietary catches which should be removable (child proof) in the event of a fire. Where escape windows cannot be achieved, direct access to a protected stairs (or protected route to inner rooms) is acceptable in compliance with ADB1- par 2.6 (a) or (b). Fire doors & frames Walls between garage and the house to be built up off foundations in masonry to give 30 minutes fire resistance and taken upto the ceiling/roof level and fire stopped with mineral wool. Door(s) between the house and garage to be FD30 to BS476-22:1987 fitted with proprietary mechanical self-closers, intumescent strips and smoke seals. Means of escape from basements If the basement storey in served by a single stairway and contains a habitable room, the basement should be either fitted with a means of escape window or door in compliance with this guidance or a protected stairs leading from the basement to the final exit in compliance with this guidance. Permitted building openings in relation to a boundary: Openings within 1.0m of a boundary An unprotected opening of 1m 2 (e.g. window) is permitted every 4.0m on the same building face. This unprotected opening can consist of two or more smaller openings within an area of 1m 2 (openings less than 0.1m 2 is permitted every 1500mm on the same building face). There are no restrictions on dimensions between openings separated by compartment walls & floors. Please refer to Diagram 20 of ADB4 Volume 1 for full details. Openings more than 1.0m from a boundary Permitted unprotected openings to be in compliance with table below for buildings not exceeding 3 storeys high (excludes basements) or more than 24m long. Table 17: Permitted unprotected areas in relation to a relevant boundary Minimum distance between side of Maximum total area of unprotected building & relevant boundary openings 1.0m 5.6m2 2.0m 12m2 3.0m 18m2 4.0m 24m2 5.0m 30m2 6.0m no limit 34

35 If sprinklers are fitted throughout the building to BS 9251, the above distances can be reduced by 50% (min 1.0m) or the unprotected opening area doubled. Please refer to ADB4 Volume 1 for full details relating to space separation and other methods of calculating unprotected areas. Fire resistance to elements of structure etc Please refer to Table A1: Appendix A of ADB: Volume 1 for full details. Table 18: Fire resistance to common elements of structure etc Building element Fire resistance Method of protection in minutes Beam, column or frame 30 All exposed faces Load bearing wall 30 Each side separately Upper floors (Max 3 storey building) 30 Underside Roof (only if forming part of an escape route) 30 Underside External walls: (i) Less than 1.0m to relevant boundary (ii) More than 1.0m to relevant boundary (max 3 storey building) Each side separately From inside building Walls & upper floors separating an integral garage from the dwelling 30 From garage side Compartment walls & floors separating Dwellings 60 Each side separately Protected stairs & lift shaft (not forming part of a compartment wall) 30 Each side separately Cavity barriers etc 30 Each side separately Note: 12.5mm plasterboard & skim finish applied to 100 x 50mm timber stud partitions/ ceiling/ floor joists as detailed in this specification will achieve 30 minutes fire resistance, two layers of 12.5mm plaster board (joints staggered) will achieve 60 minutes fire resistance. Masonry walls detailed in this specification will achieve 60 minutes fire resistance. Surface spread of flame: wall & ceiling linings Table 19: Surface spread of flame: Classification of wall & ceiling linings Please refer to Table 1: Section 2 of ADB: Volume 1 for full details. Location National class European class Small rooms upto 4m2 & 3 D-s3,d2 Domestic garages upto 40m2 Other rooms over 4m2 inc 1 C-s3,d2 Garages over 40m2 & Circulation spaces within Dwellings (e.g. hall, stairs & landings) Note: Plaster on masonry walls & plaster board & skim linings in this specification will achieve class 1. Exposed timber linings should be treated with a proprietary treatment to achieve the above classifications. 35

36 Additional fire safety & means of escape provisions for new 3 storey dwellings The stairs is to be protected & enclosed by 30 minutes fire resisting and fire insulating construction to the walls and partitions constructed in compliance with the relevant paragraph above. FD20 fire doors to BS476-22:1987 fitted with an intumescent strip rebated around top & sides of door or frame/lining. The exit from the stairway should extend direct to a final exit and to outside air. All floors to be provided with mains operated interconnected smoke alarms at ceiling level with battery back up in compliance with the relevant paragraph above. Limitations on the use of un-insulated glazed elements on escape routes to be in compliance with Table A4 of Approved Document B: Volume 1- Dwelling Houses. Residential sprinkler systems for means of escape Where fire safety requirements of the building regulations cannot be met for new dwellings, proposals for fire engineered solutions may be allowed against the requirements of Approved Document B where a risk assessment has been carried out by a suitably qualified and experienced fire engineer and approved by building control before works commence on site. The residential sprinkler system is to be designed and installed to BS 9251:2005 incorporating BAFSA technical guidance note No.1 June 2008 by a suitably qualified specialist- which must be approved by Building Control before works commence on site. If the condition not being met is a ground floor open plan arrangement and the stairs discharge into a habitable open plan area then a partial sprinkler installation to the whole of all connected open plan areas may be used. Fire separation of the route will be required from the upper floor from this open plan area with a 30 minute fire resisting partition and FD20 fire door fitted with intumescent strips. Instead of the separation it may be possible to fully sprinkler the whole dwelling and retain the open plan arrangement with the agreement of building control. With the agreement of the building control, it should be possible to reduce fire protection throughout the dwelling by 30 minutes with the introduction of a full sprinkler installation. Contact: The British Automatic Sprinkler Association (BAFSA)- Sprinklers for Safety: Use and Benefits of Incorporating Sprinklers in Buildings and Structures (2006) ISBN: See also: ISBN technical guidance note no.1 see also IMPORTANT NOTE: The above requirements for three storey dwellings need not be followed if the dwelling house has more than one internal stairway, which afford effective alternative means of escape and are physically separated from each other. 36

37 Part C: Site preparation and resistance to contaminants & moisture Horizontal damp proof courses & trays (dpc s) Horizontal Dpc s and Dpc trays with weep holes at 1.0m ctrs to be provided 150mm above ground level continuous with and sealed to the floor Dpm & radon dpc tray. Vertical damp proof courses & trays etc (dpc s) Stepped and horizontal Dpc/cavity trays are to be provided over all openings, roof abutments/projections and over existing walls with different construction or materials. Install vertical dpc or proprietary insulated cavity closers at all closings, returns, abutments to cavity work and openings etc. Radon gas protection in sub structures Full radon protection is required in the sub structure to prevent radioactive gas present in the sub soil from entering the building through cracks in the construction as detailed below, unless it is confirmed by a radon risk report from a specialist (available from that full radon protection is not required. Note: basic radon protection is required as a minimum standard in all sub structure floors as detailed in Part A and relevant diagrams of this guidance. 3 alternative methods for providing full radon gas protection in sub structures (i) Proprietary plastic radon sumps to be installed in sub floor of ground bearing slab as manufacturers details (see and diagram 2 above. Sumps to be connected to 110mm diameter proprietary air sealed upvc pipes, and fitted with an access plug cap above ground level to allow connection to a radon fan & duct systemupto eaves level of the building. A sign identifying radon pipe work is to be fixed to the wall above the capping. 1200g DPM radon barrier is to be taped and sealed at all joints, junctions, service entry points and sealed to a continuous cavity tray (using a proprietary tape) which is supported by the cavity infill at ground level and brought through the external wall leaf with weep-holes to the external skin; Or (ii) Proprietary geo-textile drainage matting or duct system laid beneath slabs as manufacturers details & connected to an extract pipe & fan system as detailed above; Or (iii) Construct ventilated beam & block floor as detailed in diagram 3 above. Further advice on radon & radon protection can be obtained from BRE at: & The Health Protection Agency at: Methane gas & other gas protection in sub structure Protection is to be provided in the sub structure in compliance with the provisions for full radon protection in item above and in the following circumstances: (i) Within 250m of a landfill site. (The Environment Agency s policy on building development on or near landfill sites should be followed). (ii) On a site containing biodegradable substances (including made up ground or fill); or subject to use that could have petrol oil or solvent spillages; or naturally occurring methane, carbon dioxide and other hazardous gases (e.g. hydrogen sulfide). Information regarding land contamination can be obtained from your local authority environmental health department. Risk assessments, ground investigations and any necessary remedial works should be carried out in compliance with Approved Document C of the Building Regulations. 37

38 Tanking systems Suitable tanking systems include asphalt, self adhesive bitumen membranes, drained cavity membranes and liquid applied membranes to have BBA or other approved accreditation and assessed by a tanking specialist as suitable for the proposed situation. Tanking systems to be installed/applied by a tanking specialist in compliance with tanking manufacturers details which must be approved by building control before works commence on site. Flood risk Flood risk should be assessed and precautions carried out in compliance with paragraph 0.8 of ADC Part D: Cavity wall filling with insulation by specialists The suitability of the cavity wall for filling must be assessed before the works is carried out by an insulation specialist in accordance with BS 8208: Part 1: The insulation specialist carrying out the work must hold or operate under a current BSI Certificate of Registration of Assessed Capability for the work being carried out. The insulation material must be in accordance with BS 5617: 1985 and the installation must be in accordance with BS 5618: 1985 The Installation of urea-formaldehyde (UF) in cavity walls is to be carried out in compliance with paragraphs of ADD1 38

39 Part E: Resistance to the passage of sound Performance standards Party walls and floors separating new dwelling/flats. Sound insulation details for new party walls and floors to be carried out in accordance with the relevant details contained within this guidance and Approved Document E as follows:. 45 db minimum values for airborne sound insulation to walls, floors & stairs; & 62 db maximum values for Impact sound insulation to floors & stairs. Party walls and floors separating conversion of buildings into new dwellings/flats Sound insulation details for new party walls and floors to be carried out in accordance with the relevant details contained within this guidance and Approved Document E as follows:. 43 db minimum values for airborne sound insulation to walls, floors & stairs; & 64 db maximum values for Impact sound insulation to floors & stairs. Exemptions/ relaxations for conversion of historic buildings into dwellings/flats If the proposed sound insulation requirements will unacceptably alter the character or appearance of a historic/listed building then the sound insulation standards may be exempt or improved to what is reasonably practical or acceptable standard that would not prejudice the character or increase the risk of deterioration of the building fabric or fittings in consultation with the local planning authorities conservation officer. A notice showing the actual sound test results is to be fixed in a conspicuous place inside the building in compliance with paragraph 0.7 of ADE Pre completion sound testing Robust details to be adopted or pre-completion sound testing to be carried out to demonstrate compliance with ADE1 as follows: (i) Robust details Robust Construction Purchase Certificates are to be provided by the building owner on commencement and provide compliance certificates on completion; which must be sent to Building Control to demonstrate compliance with ADE1. Robust Construction Details can be obtained through Robust Details Ltd. Tel: (ii) Pre completion sound testing by specialist Pre completion sound testing is to be carried out by a suitably qualified person or specialist with appropriate third party accreditation (UKAS or ANC registration) to demonstrate compliance with ADE1, and copy of test results sent to building control. Testing rate requirements At least one set of recorded tests is required for every 10 new dwellings on the same site and additional testing may be required where requested by building control. Remedial works and re-testing Remedial works and re-testing will be required where the test has failed, in compliance with Section 1 of ADE New Internal walls & floors Sound insulation details between internal walls & floors separating bedrooms or a room containing a WC and other rooms to be carried out in accordance with the relevant details contained within this guidance and Approved Document E. 39

40 Part F: Ventilation to new dwellings Ventilation systems System 1: Purge (natural) ventilation Background ventilation & intermittent extract fans in compliance with table 5.2a of ADF1- as detailed below. System 2: Passive stack ventilation in compliance with table 5.2b of ADF1. System 3: Continuous mechanical extract in compliance with table 5.2c of ADF1. System 4: Continuous mechanical supply and mechanical extract with in heat recovery compliance with table 5.2d of ADF1. System 1: Purge (natural) ventilation with background ventilation & intermittent extract fans Purge (natural) ventilation to habitable rooms Purge (natural) ventilation to be provided to all habitable rooms equal to 1/20 th (5%) floor area where the external windows/doors open more than 30 degrees and increased to 1/10 th (10%) of the floor area where the windows opens between degrees. Window openings which open less than 15 degrees is not suitable for purge ventilation and alternative ventilation details are required as detailed below and in compliance section 5 & Appendix B of Approved Document F1. Purge (natural) ventilation openings to habitable rooms to be typically 1.75m above floor level. Mechanical extract ventilation & fresh air inlets for rooms without purge ventilation Mechanical extract ventilation & fresh air inlet are required for habitable rooms without purge (natural) ventilation which must designed by a ventilation specialist having a minimum of 4 air changes per hour & manually controlled in compliance section 5 of Approved Document F1. Purge ventilation to wet rooms (kitchens/utility/bath/wc/en suit etc) Opening windows are required for purge (natural) ventilation to wet rooms (kitchens/ utility/bath/wc/en suit etc) which have external walls (no minimum sizes) in compliance section 5 of ADF1. General requirements for purge (natural) ventilation Purge (natural) ventilation openings to habitable rooms to be typically 1.75m above floor level and all internal doors to have a 10mm gap under the door for air supply transfer. The area of external windows, roof windows & doors should not exceed 25% of the usable internal floor area otherwise SAP calculations may be required from a suitably qualified person to confirm design flexibility where they exceed 25% of the usable floor area. (ii) See the relevant section in this guidance for permitted unprotected external openings in relation to relevant boundaries. Means of escape windows to be fitted with proprietary hinges to open to the minimum required clear width of 450mm. Escape windows must have minimum clear opening casement dimensions of 0.33m² and 450mm (typically 450mm wide x 750mm high), located within mm above floor level to all bedrooms and habitable rooms at 1st floor level and inner habitable rooms on the ground floor. Windows above the ground floor storey and within 800mm of floor level are to be provided with containment/ guarding/ proprietary catches which should be removable (child proof) in the event of a fire. Where escape windows cannot be achieved, direct access to a protected stairs (or protected route to inner rooms) is acceptable in compliance with ADB1- par 2.6 (a) or (b). 40

41 Mechanical extract ventilation to new dwellings Mechanical extract ventilation rates Mechanical ventilation is to be provided to the rooms listed below directly ducted to the outside air equivalent to the following rates. Kitchen 30 litres per second over hob or 60 litres elsewhere Utility room 30 litres per second Bathroom 15 litres per second (including shower rooms & en-suites) Toilet 6 litres per second W/C (with or without a window) Mechanical ventilation to rooms without open able windows to be linked to light operation and have 15 minutes overrun and a 10mm gap under the door for air supply. Note: Fans must not be installed in rooms containing open flue appliances unless the Interaction of mechanical ventilation & open flue heating appliances is checked and certified by an approved method & suitably qualified person as contained in ADJ. Continuous mechanical extract Continuous mechanical extract ventilation details are required in compliance with tables 5.1a & 5.1b of ADF1. Whole building mechanical extract Whole building mechanical extract ventilation details are required in compliance with table 5.1b of ADF1. General requirements for mechanical extract ventilation Mechanical ventilation to rooms without open able windows to be linked to light operation and have 15 minutes overrun and a 10mm gap under the door for air supply. Fans must not be installed in rooms containing open flue appliances unless the interaction of mechanical ventilation & open flue heating appliances is checked and certified by an approved method & suitably qualified person as contained in ADJ. Mechanical ventilation to be ducted in proprietary insulated ducts to outside through walls to proprietary vent or through roof space to proprietary matching tile /soffit vent Background ventilation to new dwellings Background ventilation to be provided to all rooms with external walls either through walls or in windows via hit and miss or 2 stage window catches equivalent to 5000mm 2 minimum to each habitable room and 2500mm 2 minimum to each wet room (kitchens/utility/bath/wc/en suit etc). The total area of background ventilation must be in compliance with Table 5.2a of ADF1 as follows: (i) For dwellings with any design air permeability use Table A below (i) For dwellings with design air permeability worse than 5m 3 /(h.m 2 ) use Table B below Background ventilation to be located typically 1.75m above floor level. Note: For buildings with no external walls use appropriate ventilation system 2,3 or 4 in compliance with paragraphs of ADF1. 41

42 Table A:Total background ventilation (mm 2 ) required for new dwellings with any design air permeability Number of bedrooms Total floor area (m 2 ) Less Add 7000mm 2 for every additional 10m 2 floor area Table B:Total background ventilation (mm 2 ) required for new dwellings with design air permeability leaker than 5m 3 /(h.m 2 ) Number of bedrooms Total floor area (m 2 ) Less Add 5000mm 2 for every additional 10m 2 floor area 42

43 Part G: Sanitation, hot water safety and water efficiency Sinks with hot and cold running water is to be provided in all food preparation areas, bathrooms to be fitted with either a bath or shower. Hot & cold water taps to wash basins, baths, showers & sinks including external taps to have water from a wholesome water supply. Outlets from domestic hot water storage vessels to be fitted with an in line hot water supply tempering valve to prevent water temperatures exceeding 60 ºC. Softened wholesome cold water should not be provided where drinking water is drawn off or to any sink where food is prepared The estimated water consumption for new dwellings and flats (including changes of use) is to be calculated using a Water Efficiency Calculator which is to be submitted at the application stage and approved by building control before works commence on site. The estimated consumption of wholesome water should not exceed 125 litres per person/ per day including a fixed factor of water for outdoor use of 5 litres per person/ per day. Typical specification for flow rates: 4/2.6 dual flushing toilets All taps fitted with flow regulators to 4 litres per minute Shower with flow rates of 6-9 litres per minute Standard bath (140 litres capacity to over flow) Standard washing machine Standard dishwasher Baths to be fitted with an in line mixing valve to restrict the temperature to 48 degrees C max Hot water storage systems to be restricted to 100 degrees C max and outlets from domestic hot water storage vessels to be fitted with an in line hot water supply tempering valve to prevent water temperatures exceeding 60 degrees C max. Hot water storage vessels to be fitted with a non-self-setting energy cut out to instantly disconnect the power supply. Wash hand basins to be provided in all rooms containing a w/c and a door must separate the w/c from any food preparation area in a dwelling Water tanks/cisterns must have an adequate designed flat platform base to support the proposed loads. Pumped small bore foul water drainage from a toilet is only permitted if there is also access to a gravity draining toilet in the same dwelling. Proprietary pumped foul water macerator systems must have BBA or other approved accreditation and fitted in compliance with manufacturers details to a suitable foul water drainage system. Commissioning certificates for fixed building services are required on completion with copy sent to building control 43

44 Part H: Drainage and waste disposal H1: Foul water drainage New Foul water connections to the public sewer Owners of new dwellings are required to consult with the Water Authority and obtain consent for new foul (& where necessary) surface water connections to the public sewer before works commence site. Foul, rain & storm water drainage systems Both storm and foul drainage to consist of 100mm diameter UPVC proprietary underground drainage laid at a minimum gradient of 1:40 where serves up to one wc or 1:80 where serves two or more wc s, surrounded in pea/single size gravel a minimum of 900mm deep in drives and roads and 400mm elsewhere, unless provided with a 100mm reinforced concrete slab with compressible material under and 300mm min bearing on original ground. Proprietary UPVC 450mm diameter inspection chambers to be provided at all changes of level and or direction and at 45m maximum spacing in straight runs up to 1.2m in depth. All gullies to be trapped and have rodding access where serving branches. Inspection chamber covers to be mechanically fixed and suitable for vehicular loads in drives and roads and proprietary bolt down double sealed covers and frames in buildings. Foul water to be discharged to new or existing facilities as shown on plans/specification and storm water from individual down pipes to be piped 5m away from buildings and to be disposed in a separate surface water sewer via trapped gullies or to soakaways minimum 2m³ clean filled rubble soakaways per rain water pipe serving a roof area upto 30m2, covered with polythene and top soil or to other methods as shown on the drawing/specification. Soakaways in clay sub soils or serving roof areas exceeding 30m2 per rwp to be designed in accordance with BRE Digest 365 or by a specialist (i.e. Hydrologist). Rain/surface water systems cannot be connected to foul water drains without the written permission of the relevant Water Authority. Foul drainage systems to low lying buildings or basements which carry storm water or other vulnerable drainage systems should be provided with anti flood protection such as one way valves, etc, to prevent flooding and sewerage entering the building. Waste pipes All W/Cs to have trapped outlet connected to 100mm diameter pipes, and to be provided, with a wash hand basin with hot and cold running water. Sanitary appliances such as wash hand basin, baths, showers, sinks etc, to be provided with 50mm diameter waste pipes laid to falls and 75mm deep seal traps. Where waste pipe runs exceed 4m BBA approved air admittance valves are to be fitted above appliance spill over level. Waste pipes to either discharge below trapped gully grating or into soil and vent pipes via proprietary waste manifolds or bossed junctions. Internally all waste and drainage pipes to have rodding access/eyes at changes of direction and be adequately clipped/supported and provided with 30 minutes fire protection where passing through floors. 44

45 H2: Septic tanks, sewage treatment systems & cesspools Existing septic tank & effluent drainage Where additional drainage effluent is to be connected to the existing septic tank/treatment system, it should be checked by specialist and sizes/condition of tank/system to be confirmed suitable for treatment of additional effluent. Non mains foul drainage waste water treatment systems Non mains drainage systems are to be used only where connection to the mains drainage system is not possible. Either septic tank or sewage treatment system to be installed as agreed with Building Control to suit specific ground conditions. No septic tank/ sewage treatment system and associated secondary treatment is permitted by the Environment Agency in prescribed Zone 1 ground water source protection zones. Where no other option is feasible, the installation of a cesspool is to be agreed with Building Control & the Environment Agency. Septic tanks Septic tanks to consist of a watertight chamber, water proof from both sides and the sewage is liquefied by anaerobic bacterial action in the absence of oxygen assisted by the natural formation of a surface scum or crust. Sludge settlement at the base of the tank must be removed annually. Discharge from tanks to be taken to drainage fields, drainage mounds or wetlands/reed beds for secondary treatment as detailed below. Proprietary factory made septic tanks to be designed and constructed to BS EN and installed in compliance with manufacturer s details, or Non proprietary septic tanks constructed in situ to be designed and constructed to a drainage specialist s design, approved by Building Control before the works commence on site. Typically, the tank consists of two chambers constructed using 150mm minimum thick concrete base C25P mix to BS 5328, 220mm thick engineering quality brickwork walls (or concrete), mortar mix 1:3 cement/sand ratio with designed heavy concrete roof slabs. 100mm diameter Inlet and outlet dip pipes designed to prevent disturbance of the surface scum, inlet pipe laid at a flatter gradient for at least 12 meters before it enters the tank. Septic tanks to be fitted with durable lockable lids or covers for emptying and cleaning, and inspection chamber fitted on the discharge side of tank for sampling of the effluent. Septic tanks to be sited 7m from any habitable part of any building and preferably down slopes and have a minimum capacity of 2,700 litres for upto 4 users & increased by 180 litres for each additional user. (Recommended size of septic tank to be 3,800 litres minimum). A notice plate must be fixed within the building and include the following information: Address of the property; location of the treatment system; description of the septic tank and effluent drainage installed; necessary maintenance to be carried out (including monthly checks of the apparatus and emptying of the tank every 12 months by a licensed contractor) and a statement that the owner is legally responsible to ensure that the system does not cause pollution, health hazard or nuisance. Consultations are to be carried out with Building Control and The Environment Agency before any works commence on site. It is the Occupiers responsibility to register the effluent discharge as an exempt facility with the Environment Agency for discharges of 2m3 or less per day to the ground from a septic tank. 45

46 Sewage treatment systems Proprietary sewage treatment systems treat sewage by an accelerated process to higher standards than that of septic tanks, and are to be factory made, designed and constructed to BS EN (if less than 50 persons otherwise to BS 6297: 1983 Code of Practice for design and installations of small sewage treatment works and cesspools and BBA certification or other approved accreditation), installed and maintained in compliance with the manufactures details and fitted with a uninterruptible power supply (or 6 hours power back up). Note: only treatment systems suitable for intermittent use should be used for holiday lets or similar where the system is unused for periods of time. Sewage treatment system to be sited 7m from any habitable part of any building and preferably down slopes and have a minimum capacity of 2,700 litres for upto 4 users & increased by 180 litres for each additional user. Discharges from sewage treatment systems can be taken to a water course or alternatively a designed drainage field, drainage mound, wetlands or reed beds as detailed below. A notice plate must be fixed within the building and include the following information: Address of the property; location of the treatment system; description of the sewage treatment system and effluent drainage installed; necessary maintenance to be carried out in accordance with the manufacturers details and a statement that the owner is legally responsible to ensure that the system does not cause pollution, health hazard or nuisance. Consultations should be carried out with Building Control and The Environment Agency before any works commence on site. It is the Occupiers responsibility to register the effluent discharge as an exempt facility with the Environment Agency for discharges of 5m 3 or less per day to a surface water course or 2m 3 or less per day to the ground from a sewage treatment system. Treatment of sewage from septic tanks & sewage treatment systems Drainage fields Drainage fields to consist of irrigation pipes constructed below ground allowing partially treated effluent to percolate into the ground and further biological treatment in the aerated soil layers. Construction of drainage fields to be carried out as tank/system manufacturers details and BS 6297: A1:2008. See typical section detail and drainage field layout below. The drainage field area is calculated from the percolation test results which should have a suggested minimum area of 30m x 0.6m wide subject to percolation test results and number of users and approved by Building Control before works commence on site. See below for percolation test procedure. Drainage fields to be located 10m from any water course, 50m from any point of water abstraction, 15m from any building & sufficiently far from any other drainage areas so the overall soakage capacity of the ground is not exceeded. Water supply pipes, access roads, drives or paved areas etc must not be located within the drainage areas. Drainage mounds Drainage mounds to consist of drainage fields constructed above the ground allowing further biological treatment of the partially treated effluent in the aerated soil layers. Drainage mounds to be used where there is a high water table level, impervious or semi 46

47 water logged ground. Drainage mounds and drainage mound areas should be designed by a drainage specialist for particular ground problems and approved by Building Control before works commence on site. See diagram 2 of ADH for typical drainage mound construction details. Drainage mounds to be located 10m from any water course, 50m from any point of water abstraction, 15m from any building & sufficiently far from any other drainage areas so the overall soakage capacity of the ground is not exceeded. Water supply pipes, access roads, drives or paved areas etc must not be located within the drainage areas. Wetlands/reed beds In situations where drainage fields or mounds are not suitable, wetland treatment systems consisting of manmade reed beds can be constructed as either vertical or horizontal flow reed bed systems for the purification of the partially treated effluent by filtration, biological oxidization, sedimentation and chemical precipitation as the partially treated effluent passes through gravel beds and root systems of wetland plants. Wetlands should not be constructed in shaded or severe winter areas. Vertical or horizontal flow wetland treatment systems should be designed by a drainage specialist for particular ground problems and approved by Building Control before works commence on site. A notice plate must be fixed within the building and include the following information: Address of the property; location of the treatment system; description of the sewage treatment system and effluent drainage installed; necessary maintenance to be carried out in accordance with the drainage specialists details and a statement that the owner is legally responsible to ensure that the system does not cause pollution, health hazard or nuisance. See diagram 3 of ADH for typical horizontal flow reed bed system and diagram 4 of ADH for typical vertical flow reed bed system. Percolation test method to calculate area of drainage field for septic tanks or sewage treatment systems. Step 1: Excavate a test hole 300mm square x 300mm deep below proposed invert level of the drainage field trench bottom Step 2: Fill the test hole with water and allow drain away over night Step 3: Refill to a depth of 300mm and note time taken in seconds to drain away from 75% full to 25% full (i.e. 150mm drop in level from 225mm to 75mm) Step 4: Repeat the procedure in two more test holes and calculate the average of the three results as follows: test 1 + test 2+ test 3 = average time taken 3 Step 5: Calculate the Vp (average time in seconds for the water to drop 1mm) as follows: For example: If average time above took 2100 seconds (i) Divide 2100 seconds by 150mm depth of water (ii) 2100 = 14 Vp* (see note below*) 150 (iii) Area of trench = number of persons to use property X Vp X 0.25 Therefore: 5 persons X 14 X 0.25 = 17.5m 2 of effluent drain required. (iv) To calculate actual length of trench divide 17.5m 2 by width of the trench required therefore: 17.5m 2 = (Minimum permitted area is 30m long x 0.6m wide) 0.6m wide * Vp should range between 12 and 100 to be successful; otherwise the system should be designed by a drainage specialist. 47

48 Diagram 14: Typical section through a septic tank/sewage treatment system drainage field (not to scale) Cross section detail of a septic tank/sewage treatment effluent drainage soakaway trench (not to scale) Ground level Back fill with excavated material 1200g polythene layer 100mm diam ridgid Upvc slotted pipe (slots laid down), laid at 1: mm diam clean stone below & covering pipe 600 to 900mm wide trench, as drainage field layout belowminimum 30m length of pipe work 50mm 100mm diam pipe 150mm At least 1.0m from winter water table level Minimum depth 500mm Winter water table level Diagram 14.1 : Typical drainage field plan layout (not to scale) Distribution/sampling chamber 600mm wide trench as guidance details 2000mm min separation Inlet 2000mm min non slotted upvc pipe Septic tank/sewage treatment plant as guidance details 2000mm min separation 100mm diam perforated effluent distribution pipes (perforations laid down) 30m minimum length of rigid upvc pipes Note: All effluent drainage pipe work from the tank to be laid at 1:200 gradients etc as guidance details 48

49 H3: Rainwater drainage and harvesting Rainwater gutters and down pipes Rainwater gutters and down pipe sizes and number to be suitable for roof area to be drained in compliance with the table below, and fixed in compliance with manufactures details. See H3 of ADH for further information Table 20: Gutter sizes & pipe outlet sizes for drainage of roof areas Max effective roof area m2 Gutter sizes (mm Outlet sizes (mm diam) diam) The sizes above refer to half round gutters & round rain water pipes Rainwater/ grey water harvesting storage tanks & systems Rainwater harvesting system to be designed, supplied, installed, and commissioned by specialist to supply rainwater to sanitary appliances. Below drainage pipework as foul water pipe guidance details above. Grey water systems designed for use within the building is to be designed, manufactured, installed and commissioned by a suitably qualified and experienced specialist. Grey water to be treated prior to use in toilets etc by an approved method. Overflow from the rain water storage tank is to discharge to a designed soakaway system constructed 5m from any building & septic tank soakaway system. Grey water & rainwater tanks & systems should: Prevent leakage of the contents, ingress of subsoil water & should be ventilated Have an anti backflow device on any overflow connected to a drain or sewer Have a corrosion proof locked access cover for emptying & cleaning Supply pipes from the grey water or rain water collector tanks to the dwelling must be clearly marked as either GREY WATER or RAIN WATER. Guidance should be followed in par of App Doc H2, App Doc G of the Building Regulations and the Water Regulations Advisory Scheme Leaflet No: , and BS 8515:2009. Surface water drainage around the building Paths and paved areas around the building to have a non slip finish and if not porous propriety design to be provided with a cross fall of 1:40 1:60 and a reverse gradient of at least 500mm away from walls of building. Surface water to be disposed of by an adequately sized and roddable drainage system via soakaways, or other approved means. 49

50 Oil/fuel separators Under section 111 (restrictions on use of public sewers) of The Water Industries Act 1991, it is an offence to discharge fuels into water courses, coastal water or underground water. Oil separators are required where fuel is stored or in other high risk areas or car parks and the Environment agency has issued guidance on the provision of oil separators. For paved areas around buildings or car parks a bypass separator is required with a nominal size (NSB) of times the contributing area and silt storage area (in litres) equal to 100 times the NSB. In fuel storage areas and other high risk areas full retention separators are required with a nominal size (NS) equal to times the contributing area and silt storage area (in litres) equal to 100 times the NS. Separators discharging to infiltration devices or surface water sewers should be class 1 Proprietary oil separators should be, factory made, water proof, designed and constructed to the requirements of the Environment Agency, licensing authorities requirements (where the Petroleum Act applies), pren858 and BBA certification or other approved accreditation. Separators must be installed and maintained in compliance with the manufacturers details and inlet arrangements should not be direct to the water surface, and adequate ventilation must be provided. See Appendix H3 -A of ADH3 for further information H4: Building over or close to public sewers Owners of building being constructed, extended or underpinned within 3m of a public sewer as indicated on the relevant Water Authorities sewer maps are required to consult with the Water Authority and where necessary obtain consent and enter into an agreement to build close to or over the public sewer before works commence site. Protection of the sewer pipe and systems are to be carried out in compliance with the relevant Water Authorities requirements. As part of this process, building control will check the proposed development against the relevant Water Authorities sewer maps regarding building over/close to the public sewer and where necessary building control will consult with the Water Authority and request that they send any comments directly to the building owner/agent within 14 days of the consultation. Building notices are not acceptable where an agreement is required to building close to or over a public sewer and full plans applications will be required. See H4 of ADH for further information H5: Separate systems of drainage The building owner/agent must carry out all necessary consultations with the relevant Water Authority before works commence on site. Rain/surface water systems cannot be connected to foul water drains without the written permission of the relevant Water Authority. See H5 of ADH for further information. H6: Solid waste storage 1200 X 1200mm level paved areas are required beside rear access for refuse storage containers or alternatively a communal storage area can be provided for a wheelie bin suitable to store 0.25m3 minimum per dwelling subject to approval from the waste collection authority. 50

51 Part J: Combustion appliances & fuel storage systems Space & hot water heat producing appliances in general Space and hot water heating method as detailed on the plans/specification. Heating to be supplied from new or extended gas/lpg/oil fired wall/floor mounted condensing balanced flue boiler with the flue discharging 600mm minimum away from openings into the building and protected with a proprietary wire basket to boiler manufacturers specification. Boilers to have a SEDBUK efficiency above 90% to comply with Building Regulations as amended in October 2010 for gas/ LPG/oil and must be provided with separate controls for heating and hot water with a boiler interlock, timer, and thermostat radiator valves to each room. Un-vented hot water systems require safety devices including non self setting energy cut out & temperature release valve and thermostat. Safety valves from vented hot water systems must discharge safely. Hot water vessels to be insulated with 35mm minimum thickness of PU foam and both heating and water pipes to be insulated with proprietary foam covers equal to their outside diameter within 1m of the vessel and in unheated areas. Hot water storage must not exceed a temperature of 100 degrees centigrade. Gas installations to be installed and comply with BS 5440, BS 5546, BS 5864, BS5871, BS 6172, BS 6173 and BS Oil installations to be installed and comply with BS 5410, BS 799. All space and hot water systems must be installed, commissioned, calibrated and certified by a suitably qualified person or installer registered with an appropriate competent persons scheme and details supplied to Building Control and the owner along with the operating manuals, etc before the building is completed/occupied. Solid fuel appliances up to 50kW rated output Construction of open fire place with recess & hearth Fire place walls to consist of non combustible material of at least 200mm in thickness to the side 100mm thick in the back wall recess, lined with suitable fire bricks. The hearth to be at least 125mm thickness (or 12mm thick if provided over a concrete floor slab) of non combustible materials with projections at least 150mm to the sides of the side jambs and 500mm in front of the jambs. Free standing stove with hearth Free standing stoves & hearths to be positioned 150mm minimum away from enclosing non combustible walls at least 100mm thick. Hearths to be at least 125mm thickness (or 12mm thick if provided over a 100mm thick concrete floor slab),constructed of non combustible materials with projections at least 150mm to the sides & rear of the appliance and 300mm in front of the appliance door. Air supply (ventilation) to solid fuel appliances Permanently open combustion air vents ducted to outside are to be provided in the same room as the solid fuel appliance with a total free area in compliance with the table below (see Table 1 of ADJ for further information) 51

52 Table 21: Air supply (ventilation) to solid fuel appliances Type of appliance Amount of ventilation Open fire place with no throat (i.e. under a 50% of the cross section area of the Canopy) Flue Open fire place with throat or for simple fire openings: 500mm wide 450mm wide 400mm wide 350mm wide Enclosed stove with flue draught stabilizer In new dwellings 50% of the cross section area of the Throat opening area 20,500mm 2 18,500mm 2 16,500mm 2 14,500mm 2 850mm 2 /kw of appliance rated out put Enclosed stove with no flue draught stabilizer In new dwellings 550mm 2 /kw of appliance rated out put Carbon monoxide alarms Mains operated carbon monoxide alarm is required at ceiling level in the same room as the solid fuel appliance, which must be either battery operated in compliance with BS EN 5029: 2001: or mains operated with sensor failure warning device in compliance with BS EN 5029: Type A Carbon monoxide alarm to be positioned on the ceiling at least 300mm from walls, or if located on the wall as high up as possible (above any doors or windows) but not within 150mm of the ceiling, and between 1m and 3m horizontally from the appliance Table 22: Sizes of flues in chimneys Installation Fire place with opening up to 500 x 500mm Fire place with opening more than 500 x 500mm or exposed on both sides Closed appliances* (stove, cooker, room heater & boiler) up to 30kW rated output 30-50kW rated output Closed appliances up to 20kW rated output which-burns smokeless/low-volatile fuel, or complies to the Clean Air Act Pellet burner which compiles to the Clean Air Act Minimum internal flue sizes 200mm (diameter, rectangular or square) Area equal to 15% of the total face area of the fireplace opening. (note: total face areas more than 15% or 0.12m 2 to be designed by heating specialist) (diameter, rectangular or square) 150mm 175mm See table 2 of ADJ See table 2 of ADJ 52

53 Construction of masonry chimneys Chimneys to be constructed in external quality frost resistant materials 100mm minimum thickness (increased to 200mm where separates another fire compartment or another dwelling), using brick, dense blocks or reconstituted/natural stone to match the existing, with suitable mortar joints for the masonry as the masonry manufacturers details with any combustible material kept at least 50mm away from the walls containing flues. Line chimney with manufactured flue liners installed in compliance with manufacturers details as follows: (i) Clay flue liners to BS EN 1457:2009: Class A1 N1 or Class A1 N2, to be laid vertically and continuously socket up (jointed with fire proof mortar) from appliance with a minimum diameter in compliance with table 22 (ii) Concrete flue liners to BS EN 1857:2003: Type A1, A2, B1 or B2 to be laid vertically and continuously socket up (jointed with fire proof mortar) from appliance with a minimum diameter in compliance with table 22 (iii) Liners whose performance complies to BS EN 1443:2003: designation: T400 N2 D 3 G with a minimum diameter in compliance with table 22 Backfill gaps between masonry and flue liners with a weak mix concrete using 1:6 ordinary Portland cement and vermiculite. Build in code 5 lead flashings (including apron & lay board flashings) & dpc tray into chimney as work proceeds, 150mm above all roof/wall abutments as necessary & terminate chimney with a proprietary chimney pot to match the internal flue sizes. Construction of factory made flue block chimneys Construction of factory made flue block chimneys are to be carried out in compliance with paragraphs of ADJ, and appliance manufacturer s details. Construction of factory made metal chimneys Construction of factory made metal chimneys are to be carried out in compliance with paragraphs of ADJ, and appliance manufacturer s details. Factory made metal chimneys are to be concealed in the building in compliance with paragraph 1.47 & diagrams 13 & 14 of ADJ. Configuration of flues serving open flue appliances Flues to be constructed straight and vertical with no more than a 90 degree bend with cleaning access where the flue connects to the appliance and no more than two 45 degree bends (to the vertical) in the flue configuration in compliance with paragraph of ADJ,. Inspection & cleaning openings in flues Inspection & cleaning openings should be air tight using proprietary factory made components compatible with the flue system, fitted & located to allow sweeping of the flue in compliance with appliance manufacturers details Interaction of mechanical extract vents & opened flue solid fuel appliances Where a kitchen contains an opened flue- solid fuel appliance, confirm extract ventilation will not be installed in the same room as the appliance, or alternatively seek further guidance from HETAS. 53

54 Chimney heights Chimney height not to exceed 4.5 times its narrowest thickness. Chimney/terminal to discharge at a minimum height of: 1.0m above flat roofs 1.0m above opening windows or roof lights in the roof surface 0.6m above the ridge Outside of a zone measured 2.3m horizontally from the roof slope 0.6m above an adjoining or adjacent building that is within 2.3m measured horizontally (whether or not beyond the boundary) Please refer to Diagram 17 of ADJ for full details Alternative heating producing appliances as detailed on the drawing/specification to be in compliance with ADJ. Repair/relining of existing flues Repair /relining of existing flues to be carried out by a suitably qualified and experienced specialist. Re-use of existing flues to be inspected, tested and certified by a suitably qualified and experienced specialist prior to use as suitable for solid fuel appliances. Relining of existing flues to be carried out in compliance with BS EN 1443:2003: designation: T400 N2 D 3 G with minimum diameters in compliance with table 22 using lining systems suitable for solid fuel appliances as follows: (i) Factory made flue lining systems in compliance with BS EN :2003 or BS EN :2004 (ii) Cast in-situ flue lining system in compliance with BS EN 1857:2003+A1:2008 Notice plates for hearths & flues Notice plates for hearths & flues should be permanently displayed next to the flue (or electricity consumer unit or water stop tap) detailing the property address; location of installation (room); type of installation the flue is suitable for; size & construction of flue, if suitable for condensing appliance, installation date, and any other information (optional). Appliances other than solid fuel Interaction of mechanical extract vents & opened flue combustion appliances Gas appliances Where a kitchen contains an opened flue- gas appliance, the extract rate of the kitchen fan should not exceed 20 l/s (72m3/hour) and the appliance should be tested and certificated by a suitably qualified and registered gas engineer that the combustion appliance operates safely whether or not the fans are running. Oil appliances Where a room contains an opened flue- oil appliance, the extract rate of the fan should not exceed 40 l/s for an appliance with a pressure jet burner and 20l/s for an appliance with a vaporising burner. Gas heating appliances up to 70kw Gas burning appliances up to 70kW to be installed, commissioned and tested in compliance with section 3 of ADJ, and the Gas Safety (installation & use) Regulations. All works to be to be carried out by an installer registered with Gas Safe. Copy of commissioning certificates to be issued to Building Control on completion of the works. 54

55 Oil heating appliances up to 45kW Oil burning appliances up to 45kW to be installed, commissioned and tested in compliance with section 4 of ADJ. All works to be to be carried out by an installer registered with OFTEC. Copy of commissioning certificates to be issued to Building Control on completion of the works. Renewable energy Installations Renewable energy systems must be installed, commissioned, calibrated and certified by a suitably qualified person or specialist installer registered with an appropriate competent persons scheme (where applicable) and details supplied to Building Control and the Owner along with the operating manuals, etc for the following installations: Solar photovoltaic (pv) roof/wall panels for producing electricity Biomass space heating & hot water systems Wind energy turbines for producing electricity Hydro-power systems for producing electricity Solar water heating roof/wall panel systems, fitted with an additional heating source to maintain an adequate water temperature Ground/air source heat pumps for space heating & hot water systems All roof / wall structures must be adequate to support the above installations in compliance with manufacturers details or calculations & details from a suitably qualified person which must be approved by Building Control before works commence on site. Provision of information- commissioning certificates (testing) Copy of installers commissioning certificate to be sent to building control on completion of the work. Fuel storage tanks LPG tanks and cylinders up to 1.1 tonnes LPG tanks and cylinders up to 1.1 tonnes to be positioned in the open air at least 3m from buildings or boundaries. LPG cylinders to be positioned in the open air on a minimum 50mm thick concrete base, securely chained to the wall and positioned at least 250mm below and 1m from any openings horizontally into the building such as windows, combustion, vents or flue terminals and 2m from un-trapped drains or cellar entrances. Oil tanks up to 3500 litres Oil tanks up to 3500 litres to be positioned in the open air on a concrete base with a minimum thickness of 50mm extending a minimum of 300mm beyond the tank base and be positioned a minimum of 1.8m from buildings or flues and 760mm from boundaries. They should also be provided with a proprietary fire resistant pipe and valve system. Where there is a risk of pollution to water courses, open drains including inspection chambers with loose covers, the tank should be either internally bunded or be provided with an impervious masonry bund equal to capacity of 110% of its volume. Where any of the above requirements cannot be met- please contact building control for further guidance. 55

56 Part K: Protection from falling, collision and impact Internal stairs, landings and changes in level of 600mm or more Stairs to be constructed (and finished) in materials to Clients choice to BS 5395 & BS 585 as detailed below:- (Spiral & helical stairs to be designed to BS 5395: Part 2) Stair pitch not to exceed 42 and design to be based upon dimensions taken from site and drawing. Rise and going to be level and equal to all steps and to fall within the following separate classes:- Any rise between 155mm-220mm used with any going between 245mm- 260mm, or Any rise between 165mm-200mm used with any going between 223mm- 300mm. (Twice the rise plus the going must be between 550 & 700mm) Diagram 15: Measuring rise & goings (not to scale) tread open riser Note: treads should over lap at least 16mm riser nosing top surface of tread rise top surface of tread Note: going dimention to be measured from nosing to nosing going Stair to have a minimum headroom of 2000mm above stair pitch line and to be provided with landings clear of any door swing top and bottom equal in length to the width of the stairs. If doors open across a bottom of a landing- a clear 400mm space must be maintained across the width of the flight. Minimum stair width for new dwellings is 900mm in the entrance storey suitable for disabled persons. Handrails must be provided on both sides of the stairs, at a height mm above floor/nosing levels and continuous throughout their length suitable for disabled persons. All guarding is to be at a minimum height 900mm above floor/nosing levels and continuous throughout their length, with non climbable vertical balustrading, no gaps to exceeding 100mm and all constructed to resist a horizontal force of 0.36kn/m. All open treads, gaps etc should not exceed 100mm. Typical staircase construction details: side strings ex. 230 X 35mm, capping ex. 32 X 63mm, treads 25mm thick, risers in 12.5mm thick plywood, newel posts ex. 75 X 75mm, handrails ex. 75 X 63mm, balustrades ex. 32 X 32mm at 125mm ctrs fixed into proprietary timber head & base rebated capping. ` 56

57 Diagram 16: Typical internal stair case & guarding construction details (not to scale) At least 2000mm clear head room (can be reduced to 1900mm at the centre of the stairs & 1800mm at the side in loft conversions) Handrail & guarding at least 900mm high above landing level Newel post Handrail & guarding at least 900mm high above pitch line non climable balustrades & no gaps to exceed 100mm trimmer joists Landing Landings must be level & equal in length to the smallest width tread All guarding must resist a horizontal force of 0.36kn/m pitch line At least 2000mm clear head room (can be reduced to 1900mm at the centre of the stairs & 1800mm at the side in loft conversions) Note: No opening to allow the passage of 100mm diam sphere rise outer string Flight Max 42 degree pitch Landing Note: Landings to be clear of any obstructions. A door may swing accross a landing at the bottom of a flight but must allow a 400mm min clear space accross the full width of the flight clear of any door swing External stairs, landings and changes in level of 600mm or more External stairs & landings As internal stair guidance details above External guarding Guarding to external stepped access/openings/balconies to be at least 1100mm high provided with non climbable vertical balustrading, with no gaps exceeding 100mm and constructed to resist a horizontal force of 0.74kn/m. All open treads, gaps etc should not exceed100mm. Guarding to upper storey window openings/other openings within 800mm of floor level Opening windows located above the ground floor storey with openings within 800mm of floor level must be provided with non climbable containment/guarding or proprietary catches which should all be removable (but child proof) to means of escape windows in the event of a fire. All gaps etc to containment/guarding should not exceed 100mm. 57

58 Part L: Conservation of fuel and power in new dwellings Target & dwelling emissions rates Target Emissions Rate (TER) and a design Dwelling Emissions Rate (DER) to be provided in compliance with SAP 2009 and ADL1A as soon as possible and before works commence on site. Sap rating & energy performance certificate As built SAP rating (or design SAP rating if the construction details are unchanged) & registered energy performance certificate to be provided in compliance with SAP 2009 and ADL1A, within 5 days prior to completion. Building control can provide a target and dwelling emission rate, SAP rating & registered energy performance certificate in compliance with SAP 2009 if required, please contact Building Control on for more information. Fabric standards (worst acceptable standards) Thermal insulation standards in new dwelling to be in compliance with paragraphs and worst acceptable standards in compliance with table 2 of AD L1A as follows: Roof: U-value 0.20 W/m 2.K Walls: U-value 0.30 W/m 2.K Floor: U-value 0.25 W/m 2.K Party wall: U-value 0.20 W/m 2.K Windows, roof lights, doors & curtain walling : U-value 2.00 W/m 2.K Air permeability: m 3 /h.m 2 at 50pa Recommended starting u values Thermal insulation standards have been indicated in this guidance to achieve the following starting point U values: All roof types: U-value 0.13 W/m 2.K Walls: U-value 0.18 W/m 2.K Floors: U-value 0.13 W/m 2.K U values for party walls Party walls U values to be in compliance with table 3 of AD L1A as follows: Solid walls: U-value 0.0 W/m 2.K Unfilled cavity with effective edge sealing: U-value 0.2 W/m 2.K filled cavity with effective edge sealing: U-value 0.0 W/m 2.K Note: Unfilled cavity with no effective edge sealing will not achieve the minimum required worst case U-value of 0.2 W/m 2.K 58

59 Energy efficient lighting Fixed internal & external energy efficient lighting systems to be provided in compliance with paragraph 4.13 of ADL1A as follows: Fixed internal lighting Fixed internal energy efficient lighting in new dwelling will be at least 75% of all the fixed low energy light fittings (fixed lights or lighting units) in the main dwelling spaces (excluding cupboards & storage areas), fitted with lamps which must have a luminous efficiency greater than 40 lumens per circuit-watt and a total output greater than 400 lamp lumens. (note: light fittings with less than 5 circuit-watts are excluded) Fixed external lighting Fixed external energy efficient lighting in new dwelling will consisting of either; (i) Lamp capacity not greater than 100 lamp-watts per light fitting and fitted with automatic movement detecting control devices (PIR) and automatic daylight cut-off sensors; or (ii) Lamp efficacy greater than 45 lumens per circuit-watt; and fitted with automatic daylight cut-off sensors and manual controls. Limiting the effects of solar heat gains in summer Details of measures taken to limit solar gains to be provided in energy assessment in compliance with paragraphs of ADL1 Limiting thermal bridging around external openings Thermal bridging around external openings will be provided in compliance with paragraphs of ADL1A as follows: (i) Adopt a quality- assured accredited construction detail approach approved by the Secretary of State and the calculated linear thermal transmittance can be used directly in the DER calculation in compliance with paragraph 5.12 a. (ii) Use non- assessed details in compliance with BRE Report BR 497 Conventions for Calculating Linear Thermal Transmittance and Temperature Factors 2007, (ISB N ) and the increased calculated values can be used in the DER calculations, in compliance with paragraph 5.12 b. (iii) Use unaccredited details with no specific quantification of the thermal bridge values. In such cases a conservative default y- value of 0.15 must be used in the DER calculation in compliance with paragraph 5.12 c. Air permeability & pressure testing Limiting air leakage Air leakage will be limited in the new dwelling fabric as indicated on plan layouts/ section details in compliance ADL1A and Accredited Construction Details (see information available from: All external door and window frames, service penetrations to walls, floors, joists and ceilings, etc, should be sealed both internally and externally with proprietary sealing products such as proprietary waterproof mastic, expanding foam or mineral wool or tape to ensure air tightness. 59

60 Pressure testing of new dwellings Where required by the SAP rating, pressure testing will be carried out by a specialist registered by the British Institute of Non-destructive Testing in compliance with the TER design limits in compliance with paragraphs Test results to be provided by specialist and copy sent to Building Control within 7 days after test carried out. Building control can provide pressure testing if required, please contact Building Control on for more information. Pressure testing will be carried out on three units of each dwelling type or 50% of all instances of that dwelling type, whichever is the less in compliance with paragraph 5.18 of ADL1A. Alternative to pressure testing Alternative to pressure testing on small sites of less than two dwellings to be erected: (i) Confirm with test results that a same dwelling type has been constructed by the same developer within the last 12 months and has achieved the required design air permeability in compliance with paragraph of ADL1A. or (ii) To avoid the need for any pressure testing by using a value of 15m 3 /(h.m 2 ) at 50Pa for the air permeability when calculating the DER. Providing information The following information will be provided in the new dwelling on completion in compliance with paragraphs of ADL1A: Operating & maintenance instructions for fixed building services Instructions how to make adjustments to timing and temperature control settings etc Instructions on routine maintenance requirements for fixed building services in compliance with manufacturers details Energy assessment data used to calculate the TER & DER and the as built Energy Performance Certificate 60

61 Part M: Access to and use of buildings for disabled External ramped approach A level/ramped approach with a firm hard non slip surface at least 900mm wide is to be provided from a vehicular parking area or the street/road not steeper than 1:15 with 1.2m landings every 10m or 1:12 with landings every 5m both with top and bottom landings at least 1.2m clear of a door swing up to the principal entrance door. External Stepped approach Sites with a slope of more than 1:15 may be provided with a stepped approach as follows: An unobstructed width of at least 900mm with a firm hard non slip surface to all steps and landings Landings to be provided at the top & bottom of the steps at least 900mm long The rise of a flight must not exceed 1.8m between landings Steps to have a suitable tread nosing profile and uniform rise between mm and a uniform going of 280mm (which for tapered treads should be measured at a point 270mm from the inside of the tread). Where there are 3 or more risers, a continuous handrail is to be provided on one side of the flight with a grippable profile fixed mm above the step pitch line and extending 300mm beyond the top & bottom nosings. Even when a stepped approach is used, an accessible or level threshold as describe below should be provided. If a step is unavoidable, the rise should not exceed 150mm. Accessible level door thresholds into the building Level landings should be provided at the same level as the entrance door thresholds with a fall of 1:40 1:60 away from the door separated from the building by proprietary tanking and a proprietary drained channel or 25mm max drainage slot- linked into the storm water drainage system. The door threshold should have a maximum 15º slope into the drainage channel/slot and provided with a proprietary raised threshold storm proof weather seal which should not exceed 15mm high (any projection more than 5mm should have chamfered or rounded edges) to allow safe unobstructed wheel chair access into the building. External door opening widths The external principal entrance door should have a minimum clear opening between the door leaf and doorstops of 775mm. Internal passageways/corridors widths Internal passageways/corridors should have minimum widths as set out in the table below: Doorway clear opening Corridor/passageway width* width mm mm 750 mm or wider 750 mm 775 mm 800 mm 900 mm (when approached head on) 1200 mm (when not approached head on) 1050 mm (when not approached head on) 900 mm (when not approached head on) * Note: A corridor width of 750mm min is acceptable where there is a permanent obstruction not exceeding 2.0m in length, e.g. radiator or similar providing the obstruction it is not placed opposite a door that would prevent a wheel chair user turning. 61

62 Internal stairs Minimum stair width for new dwellings is 900mm in the entrance storey suitable for disabled persons. Handrails must be provided on both sides of the stairs, at a height mm above floor/nosing levels and continuous throughout their length suitable for disabled persons. Stairs, landings & guarding to be compliance with Part K of this guidance Accessible switches, sockets, controls etc All switches and sockets including the consumer unit, ventilation & service controls, door bells, entry phones, telephone points & tv/computer sockets etc, should be fixed between mm above floor level. Accessible consumer units should be fitted with a child proof cover or installed in a lockable cupboard. Provision of a ground floor W/C A W/C must be provided on the principal entrance storey with an outward opening door conforming to the above widths. The W/C enclosure/position should have a clear space of at least 450mm each side of the centre of the W/C with a clear space of at least 750mm in front of the W/C pan to allow a wheelchair to approach within 400mm of the W/C from the front or within 250mm of the front of the W/C pan from the side. The washbasin is to be positioned not to impede access and the spaces outlined above. 62

63 Part N: Safety glazing, opening & cleaning Safety glass and glazing Doors and adjacent sidelights/windows in critical locations within 1500mm of ground and floor level, and 300mm of doors and windows within 800mm of floor/ground to be safety glazed to: BS EN 12150, BS EN 14179, BS EN 14449, which supersedes BS 6206 in compliance with the following diagram: Diagram 17: Glazing in windows, partitions, doors, side panels/screens & walls Safety glazing must comply with the new system of marking which requires visible and clear and indelible markings on each piece of safety glazing within critical locations in compliance with: BS EN 12150, BS EN 14179, BS EN

64 Part P: Electrical safety Electrical Installations New or works to existing electrical circuits or systems must be designed, installed, tested and certified to BS 7671 or with the current editions of the IEE regulations by a competent person in compliance with Approved Document P of the Building Regulations. A competent electrician or a member of a competent person scheme must test and certify all such works. The electrician must provide signed copies of an electrical installation certificate conforming to BS 7671 for the owner of the property and a copy must be forwarded to the Building Control surveyor for approval at completion, so the Building Control completion certificate can be issued. All switches and sockets including the consumer unit, ventilation & service controls etc, should be fixed between mm above floor level. Accessible consumer units should be fitted with a child proof cover or installed in a lockable cupboard. 64

65 External works- paths, drives, patio & gardens New external paths to be shuttered 100mm thick conc. Mix type PAV 1, max bay size 6m with bitumen impregnated fiber board isolated Joints to BS 8110/5328. New tarmac areas to be rolled 20mm base course of coated macadam with 6mm textured bitumen macadam wearing course with concrete edgings, to BS4987. New 60mm pre-cast self draining concrete block paving to clients choice, laid in compliance with manufacturers details, to BS6717. Concrete/natural stone slabs to clients choice, laid in compliance with manufacturers details to BS 7263:1 Drainage of paved areas to be carried out in accordance with BS 6367:1983 A1 84 and Approved Document H. Paths and paved areas to have a non slip finish with a fall of 1:80 and a reverse gradient of at least 500mm away from walls of building. Surface water to be disposed of by an adequately sized and roddable drainage system via soakaways, or other approved means. 65

66 Materials and workmanship All materials must comply with the following: British Standards or European Standards Product Certification Schemes (Kite marks) Quality Assurance Schemes British Board of Agreement Certificates (BBA) Construction Product Directives (CE Marks) Local Authority National Type Approvals (System Approval Certification) All materials must be fixed in strict accordance with manufacturers printed details and workmanship must be in strict accordance with BS 8000: Workmanship on Building Sites: Parts: 1 to 16. Where materials, products and workmanship are not fully specified or described, they are to be: Suitable for the purpose stated or inferred & In accordance with recognized good practice Guidance notes copyright Guidance notes copyright & produced by: Tony Gwynne, Forest of Dean District Council, Council Offices, High Street, Coleford, GL16 8HG. Tel: , Website: E mail: [email protected] Acknowledgements: Front cover illustration by Apex Architecture Consultancy: Information for domestic sprinklers by Nationwide Fire Sprinklers Ltd: Important note: It should be made clear that whilst every care has been taken to in compiling this publication, and the statements it contains, no party or individual involved in this publication can accept any responsibilities for any inaccuracies. Additional building control services we can provide Building control can now provide the following services and manage them through your project as part of the service we offer: o SAP Calculations: Design Stage Calculations includes Residential Energy Performance Certificate and registration of certificate on completion. o Air Leakage Testing ( Residential & commercial) o SBEM Calculations o Code for Sustainable Homes Assessments o Renewable Energy Evaluations/Payback Reports etc o Fire Risk Assessments For more information, please contact Tony Gwynne, Mark Saunders or Simon Drake on

67 For further advice on Building Regulation issues in Gloucestershire please contact your local Building Control Service: Cheltenham and Tewkesbury Building Control Service Cheltenham Office: Municipal Offices, Promenade, Cheltenham, GL50 9SA Tel: Fax: Cotswold District Council Building Control, Trinity Road, Cirencester, GL7 1PX Tel: Fax: Forest of Dean District Council Building Control Services, Council Offices, High Street, Coleford, GL16 8HG Tel: Fax: Gloucester City Council Building Control, 4 th Floor, Herbert Warehouse, The Docks, Gloucester, GL1 2EQ Tel: Fax: [email protected] Stroud District Council Building Control Services, Ebley Mill, Westward Road, Stroud, GL5 4UB Tel: Fax: [email protected] Useful numbers of other agencies or companies Forestry Commission Sewage & Water Suppliers: Severn Trent Water Welsh Water/Dwr Cymru Environment Agency Emergency Pollution Hot Line Transco Gas Emergencies Health & Safety Executive Gloucestershire County Council General Enquiries Gloucestershire Fire & Rescue Service Highways Agency (Amended Oct Tony Gwynne) 67