Revision History Revision Description Date P1 Planning 24/07/14

45 CLARENDON ROAD, LONDON W11 Structural Engineer s Specification ISSUE 1 PLANNING July 2014 Revision History Revision Description Date P1 Planning 24/07/14

CONTENTS D20 EXCAVATING AND FILLING.. 1 D30 PILING. 5 D40 EMBEDDED RETAINING WALLS. 10 E05 IN SITU CONCRETE CONSTRUCTION GENERALLY. 18 E10 MIXING/ CASTING/ CURING IN SITU CONCRETE.. 20 E20 FORMWORK FOR IN SITU CONCRETE.. 26 E30 REINFORCEMENT FOR IN SITU CONCRETE.. 28 E41 WORKED FINISHES TO IN SITU CONCRETE.. 29 G10 STRUCTURAL STEEL FRAMING.. 30 G20 CARPENTRY/ TIMBER FRAMING / FIRST FIXING 36 P31 HOLES, CHASES, COVERS AND SUPPORTS FOR SERVICES.. 40 APPENDIX A BP PERFORMANCE SPECIFICATIONS FOR PLANNING 42

1 D20 EXCAVATING AND FILLING To be read with Preliminaries/ General conditions and in conjunction with the Stage Design Statement by BP. GENERALLY / THE SITE 110 SITE INVESTIGATION - Report: Prepared by Chelmer Site investigations Ltd, available. 145 VARIATIONS IN GROUND WATER LEVEL To be monitored by contractor. - Give notice: If levels encountered are significantly different from levels in the site investigation report or previously measured. 150 EXISTING SERVICES, FEATURES AND STRUCTURES - Services: See section A12 for locations. - Site features to be retained: See section A12 for details. - Structures: See section A34 for details of protection. CLEARANCE/ EXCAVATING 168 SITE CLEARANCE - Timing: Before topsoil stripping, if any. - General: Clear site of rubbish, debris and vegetation. Do not compact topsoil. 170 REMOVING SMALL TREES, SHRUBS, HEDGES AND ROOTS - Identification: Clearly mark trees to be removed. - Small trees, shrubs and hedges: Cut down - Roots: Grub up and dispose of without undue disturbance of soil and adjacent areas - Safety: Comply with HSE/ Arboriculture and Forestry Advisory Group safety leaflets. 225 HANDLING TOPSOIL - Aggressive weeds: - Species: Included in the Weeds Act, section 2 or the Wildlife and Countryside Act, Schedule 9, part II. - Give notice: Obtain instructions before moving topsoil. - Contamination: Do not mix topsoil with: - Subsoil, stone, hardcore, rubbish or material from demolition work. - Other soil or material containing aggressive weeds, sharps, plastics and non-soil forming materials and notifiable animal or plant diseases. - Oil, fuel, cement or other substances harmful to plant growth. - Other classifications of topsoil. - Multiple handling: Keep to a minimum. Use topsoil immediately after stripping. - Wet conditions: Handle topsoil in the driest condition possible. Do not handle during or after heavy rainfall or when it is wetter than the plastic limit as defined by BS 3882, Annex N2. 240 ADJACENT EXCAVATIONS - Requirement: Where an excavation encroaches below a line drawn at an angle from the nearest formation level of another higher excavation, the lower excavation, all work within it and backfilling thereto, must be completed before the higher excavation is made. - Angle of line below horizontal: 45 degrees.

2 250 PERMISSIBLE DEVIATIONS FROM FORMATION LEVELS - Beneath mass concrete foundations: ±25 mm. - Beneath ground bearing slabs and r.c. foundations: ±15 mm. - Embankments and cuttings: ±50 mm. - Ground abutting external walls: ±50 mm, but such as to ensure that finished level is not less than 150 mm below dpc. 260 INSPECTING FORMATIONS - Give notice: Make advance arrangements for inspection of formations for foundations and filling formations. - Preparation: Just before inspection remove the last 150 mm of excavation. - Trim to required profiles and levels, and remove loose material. - Seal: Within 4 hours of inspection, seal formations with concrete 270 FOUNDATIONS GENERALLY - Give notice if: - A natural bearing formation of undisturbed subsoil is not obtained at the depth shown on the drawings. - The formation contains soft or hard spots or highly variable material. 310 UNSTABLE GROUND - Generally: Ensure that the excavation remains stable at all times. - Give notice: Without delay if any newly excavated faces are too unstable to allow earthwork support to be inserted. - Take action: If instability is likely to affect adjacent structures or roadways, take appropriate emergency action. 320 RECORDED FEATURES - Recorded foundations, beds, drains, manholes, etc: Break out and seal drain ends. - Contaminated earth: Remove and disinfect as required by local authority. 330 UNRECORDED FEATURES - Give notice: If unrecorded foundations, beds, voids, basements, filling, tanks, pipes, cables, drains, manholes, watercourses, ditches, etc. not shown on the drawings are encountered. 360 EXCESS EXCAVATION - Excavation taken wider than required: - Backfill: GEN 1 concrete as specification E10/105. - Excavation taken deeper than required: - Backfill: GEN 1 concrete as specification E10/105. DISPOSAL OF MATERIALS 415 EXCAVATED TOPSOIL REMOVAL - General: Remove from site. 450 WATER - Generally: Keep all excavations free from water until: - Formations are covered. - Below ground constructions are completed. - Basement structures and retaining walls are able to resist leakage, water pressure and flotation. - Drainage: Form surfaces of excavations and fill to provide adequate falls. - Removal of water: Provide temporary drains, sumps and pumping as necessary. Do not pollute watercourses with silt laden water.

3 454 GROUND WATER LEVEL, SPRINGS OR RUNNING WATER - Springs/ Running water: Give notice immediately if encountered. 457 PUMPING - General: Do not disturb excavated faces or stability of adjacent ground or structures. - Pumped water: Discharge without flooding the site or adjoining property. - Sumps: Construct clear of excavations. Fill on completion. - Locations: submit proposals. FILLING 500 PROPOSED FILL MATERIALS - Details: Submit full details of proposed fill materials to demonstrate compliance with specification, including: - Type and source of imported fill. - Proposals for processing and reuse of material excavated on site. - Test reports as required elsewhere. - Timing: at least 21 days before starting filling. 510 HAZARDOUS, AGGRESSIVE OR UNSTABLE MATERIALS - General: Do not use fill materials which would, either in themselves or in combination with other materials or ground water, give rise to a health hazard, damage to building structures or instability in the filling, including material that is: - Frozen or containing ice. - Organic. - Contaminated or noxious. - Susceptible to spontaneous combustion. - Likely to erode or decay and cause voids. - With excessive moisture content, slurry, mud or from marshes or bogs. - Clay of liquid limit exceeding 80 and/or plasticity index exceeding 55. - Unacceptable, class U2 as defined in the Highways Agency Specification for highway works, clause 601. 520 FROST SUSCEPTIBILITY - General: Except as allowed below, fill must be non-frost-susceptible as defined in Highways Agency Specification for highway works, clause 801.8. - Test reports: If the following fill materials are proposed, submit a laboratory report confirming they are non-frost-susceptible: - Fine grained soil with a plasticity index less than 20%. - Coarse grained soil or crushed granite with more than 10% retained on a 0.063 mm sieve. - Crushed chalk. - Crushed limestone fill with average saturation moisture content in excess of 3%. - Burnt colliery shale. - Frost-susceptible fill: May only be used within the external walls of buildings below spaces that will be heated. Protect from frost during construction 530 PLACING FILL - Surfaces of excavations and areas to be filled: Free from loose soil, topsoil, organic material, rubbish and standing water. - Freezing conditions: Do not place fill on frozen surfaces. Remove material affected by frost. Replace and recompact if not damaged after thawing. - Adjacent structures, membranes and buried services: - Do not overload, destabilise or damage. - Submit proposals for temporary support necessary to ensure stability during filling.

4 - Allow 14 days (minimum) before backfilling against in situ concrete structures. - Layers: Place so that only one type of material occurs in each layer. - Earthmoving equipment: Vary route to avoid rutting. 535 COMPACTION - General: Compact fill not specified to be left loose as soon as possible after placing. - After compaction: Surface of each layer must be well closed, showing no movement under compaction plant, and without cracks, holes, ridges, loose material and the like. - Defective areas: Remove and recompact to full thickness of layer using new material. 540 BENCHING IN FILL - Adjacent areas: If, during filling the difference in level between adjacent areas of filling exceeds 600 mm, cut into edge of higher filling to form benches 600 mm minimum width and height equivalent to depth of a layer of compacted filling. - New filling: Spread and compact to ensure maximum continuity with previous filling. 615 LOOSE TIP FILLING FOR LANDSCAPE AREAS - Filling: Do not firm, consolidate or compact when laying. Tip and grade to approximate levels in one operation with minimum of trafficking by plant. 618 HIGHWAYS AGENCY TYPE 2 UNBOUND MIXTURE - Fill: To Highways Agency Specification for highway works, clauses 801 and 804: - Crushed rock (other than argillaceous rock). - Crushed concrete. - Crushed non-expansive slag. - Well-burned non-plastic colliery shale. - Natural gravel. - Natural sand. - Filling: To Highways Agency Specification for highway works, clause 801.3 and 802. 650 PROTECTION OF COMPACTED FILLING - Temporary protective filling: Before allowing construction traffic, raise level of compacted cohesive soil filling at least 150 mm above formation level using properly compacted temporary filling. - Removal: Remove temporary protective filling from site before permanent construction. 700 BACKFILLING AROUND FOUNDATIONS - Under oversite concrete and pavings: Hardcore as clause 710 - Under grassed or soil areas: Material excavated from the trench, laid and compacted in 300 mm maximum layers. 730 BLINDING - Surfaces to receive sheet overlays or concrete: - Blind with: - Concrete where shown on drawings; or - Sand, fine gravel, or other approved fine material applied to fill interstices. Moisten as necessary before final rolling to provide a flat, closed, smooth surface. - Sand for blinding: To BS EN 12620, grade 0/4 or 0/2 (MP). - Permissible deviations on surface level: +0-25 mm.

5 D40 PILING To be read with Preliminaries/ General conditions and in conjunction with the Stage Design Statement by BP. GENERAL 110 PILING SPECIFICATION - Standard: Comply with the current edition of Specification for piling and embedded retaining walls (SPERW). - References to Engineer in SPERW: For the purpose of this contract, interpret such references as being to the person named in section A10 as administering the contract on behalf of the Employer. - Design working life category: 4 (50 years) 130 PILES - Standard: To SPERW, sections B2 B6, as appropriate to the pile type. - Permitted types: Any type of rotary bored pile. - Project specification: Submit proposals to cover the SPERW requirements in clause B1.2 and listed under this heading for the chosen pile type. - Other requirements: Limited headroom piling required beneath overhanging tree as noted on the drawings. 170 BORED CAST-IN-PLACE PILES - Standard: To SPERW, section B3. - Filling material: Reinforced concrete. - Pile group designation: All internal piles. - Diameter: Contractor choice. - Length: Contractor choice. - Reinforcement: Quantity: Contractor choice. Extent: As required by pile design - Other requirements: None. SYSTEM PERFORMANCE 210 CONTRACTOR DESIGN - Standard: To BS8004, BS8110 - Design responsibility: - Piles: Complete design in accordance with SPERW, clause B1.4, option 2. - Other: None. - Pile layout: Refer to drawings. - Site investigation: Confirm as adequate or propose further investigations as considered necessary. - Performance criteria for piles: As Clause 130 - Other requirements: None. - Submission of information: As required by SPERW, table B1.1 and elsewhere, as appropriate for the pile type, materials and tests specified. - Amendments to requirements specified in SPERW for information required: Prior to commencing the works: Submit proposals for working close to the façade and proposals for monitoring ground movements. Submit calculations illustrating predicted wall movements and demonstrating compliance with Clause 285 of this specification. Submit proposals for limited headroom piling. 230 GROUND INVESTIGATION - Report: Prepared by Chelmer Site investigations Ltd, available. - Datum for borehole logs: As site investigation report. - Obstructions/ voids: As described in site investigation report.

6 250 PERFORMANCE CRITERIA FOR STRUCTURE TO BE SUPPORTED ON THE PILES - Permitted settlement at working load (maximum): 20mm 260 SPECIFIED WORKING LOADS FOR PILES - Design factor of safety (minimum): 3. - Pile group designation: All. - Load magnitude: Refer to drawings. 285 DAMAGE TO ADJACENT STRUCTURES AND SERVICES - Permissible damage criteria: - Structures: No worse than CIRIA C580 Table 2.5 Category 2. - Services: No damage permitted. 290 BASIS FOR SETTING OUT - Site datum: Refer to drawings. - Site grid: Refer to drawings. 300 COMMENCING SURFACE - Level: Refer to drawings. 320 PILE LENGTH TOE LEVEL - Pile group designation: All. - Pile cut-off level: Refer to drawings. - Depth of pile toe beneath site datum (minimum): As required by design. - Other requirements: None. 345 INSTALLATION TOLERANCES FOR PLUNGED COLUMNS - Pile tolerances: - Setting out at ground level: + / - 25mm - Verticality: 1:200 - Column tolerances: - Setting out at ground level: + / - 10mm - Centrality on pile head: + / - 50mm. - Verticality: 1:600 target, 1:300 max. - Level of head: + / - 25mm - Rotational: + / - 15 deg. - Method of achieving tolerances: Submit proposals. PRODUCTS 440 PERMANENT CASING - Submit proposals. 445 SLEEVES - Submit proposals. 450 COATING of plunged columns not required. 470 CONCRETE GENERALLY - Standards: To BS 8500-2 and SPERW, section B19. - Project compressive strength testing of concrete: One sample taken from each of the first three piles and thereafter one sample from every 5 th pile. - Exchange of information: Provide concrete producer with information required by BS 8500-1, clauses 4 and 5.

7 480 DESIGNED CONCRETE BY PILING CONTRACTOR - Embedded metal: Carbon steel reinforcement and structural steel. - Compression strength class (cylinder/ cube minimum): C32/40 - Target density (oven-dry): Normal. - Fibres: Not required. - Aggregates: - Size (maximum): 20mm - Type/ Density: Normal weight. - Coarse recycled aggregates: Not permitted. - Additional aggregate requirements: None. - Design chemical class: DC-4 (FND4) - Limiting values for composition: - Water:cement ratio (maximum): Contractor s choice - Cement/ Combination content (minimum): Contractor s choice - Cement/ Combination content (maximum): Contractor s choice - Air content in situ (minimum): Contractor s choice - Consistence class: Contractor s choice - Permitted cement/ combinations: Contractor s choice. - Chloride class: CI 0.2 - Admixtures: Submit proposals. - Additional requirements: None. 530 REINFORCEMENT GENERALLY - Steel reinforcement: To BS4449 - Type/ Strength grade: Ribbed bar, Grade 500B - Supplier: Firm holding a valid certificate of approval issued under a product certification scheme operated by a third party certification body with appropriate Category 2 accreditation from the United Kingdom Accreditation Service (UKAS). - Other requirements: None. 540 COVER TO REINFORCEMENT - Cover (nominal): 75mm - Method of ensuring correct cover: Submit details. 550 LAPS IN REINFORCEMENT - Length (minimum): 40 x bar diameter. - Type:. 580 PLUNGE COLUMNS - Material: Grade S355J0. - Fabrication: To National Structural Steelwork Specification. - Protective coating: Not required. EXECUTION 610 METHOD STATEMENT - Requirement: Submit proposed method of installation to achieve the design parameters, including: - Details of equipment. - Programme showing sequence and resources. - Confirmation that performance requirements for load and settlement will be achieved. 615 RECORDS AND SUBMISSION OF INFORMATION DURING THE WORKS - Generally: As required in SPERW, tables B1.1, B1.6 and elsewhere, as appropriate for the pile types, materials and tests specified. - Amendments to requirements: None.

8 620 WELDING PROCEDURE - Requirements additional to SPERW, section B6: None. 625 NON-DESTRUCTIVE TESTING OF WELDS - Requirements: To SPERW, clause B6.6. - Erratum: Substitute BS EN ISO 5817 for BS EN 5817. - Additional requirements: None. - Exceptions to requirements of BS EN 12063, table 1: None. 650 PERFORMANCE OF WORKING PILES - Substandard performance: Give notice if the performance of any pile will be less than that of a similar pile whose test behaviour has been accepted. 675 SUPPORT FLUID - Standard: To SPERW, section B18. - Usage: Submit proposals. - Permitted fluids: Bentonite - Loss of fluid: Submit proposals. - Additional requirements: None. 685 EXCAVATED MATERIAL - Disposal: To be removed from site by Piling Contractor. 690 DISPOSAL OF PILE HEADS - Cutting down and disposal: Contractor s responsibility. 696 METHOD OF PLACING PILE FILLING - Designation: All. - Requirement: Submit proposals. 700 PLACING FILLING IN DRY BORINGS AND CASINGS - Requirements additional to SPERW, clause B3.5.2.3: - Height of lower end of delivery tube above bottom of reinforcement cage (maximum): Submit proposals. - Free fall of concrete (maximum): Submit proposals. 702 INSTALLATION OF PLUNGE COLUMNS - Survey: On completion of borehole, survey location and verticality of hole. Report if plunge column tolerances will be difficult to achieve and submit proposals. - Placing: Place pile concrete and while concrete is still fluid insert column. Check location and verticality of column before concrete sets. - Backfill: When concrete has set, backfill voids around column with Sand. - Protect: Column from impact and movement due to ground heave during bulk excavation. 750 TESTING SUPPORT FLUID - Submit proposals. 755 PREPARATION OF PILE HEADS FOR INTEGRITY TESTING - Preparation: To suit test method. - Inconsistencies: Submit report on inconsistencies which could inhibit execution or interpretation of test. 760 PILE INTEGRITY TESTING GENERAL - Method: Submit proposals - Satisfactory evidence in support of proposals: Submit. - Period between casting and testing (minimum): 7 days.

9 - Piles to be tested: - Pile group designation: All. - Number of piles to be tested: 20% - Locations: To be agreed on site - Programme: To be agreed on site - Other requirements: None. COMPLETION 910 HEALTH AND SAFETY FILE - Piling completion report: Collate and submit a full set of pile records for inclusion in the health and safety file. - Content and date for submission: As SPERW, clause B1.12.2. - Record plan: Give the number of each pile and its final location relative to nearest grid. - Additional requirements: None. 920 PILING GUARANTEE - Type: Insurance backed. Administered by an independent insurance protection company. - Guarantee period (minimum): 12 years - Documentation: Provide certificates/ guarantees at completion of piling works.

10 D40 EMBEDDED RETAINING WALLS To be read with Preliminaries/ General conditions and in conjunction with the Stage Design Statement by BP. GENERAL 110 EMBEDDED RETAINING WALL SPECIFICATION - Standard: Comply with the current edition of Specification for piling and embedded retaining walls (SPERW) except where specified otherwise. - Substitution of British Standards for SPERW requirements: None. - References to the Engineer in SPERW: For the purpose of this contract, interpret such references as being to the person named in section A10 as administering the contract on behalf of the Employer. 130 EMBEDDED RETAINING WALL - Permitted types: assumed to be contiguous continuous flight augured piles but final design to contractor s proposals. - Particular: specification: Submit proposals to cover the SPERW requirements listed under this heading for chosen wall type. - Other requirements: Consider site access constraints discussed in the Stage Design Statement by BP. 175 CONTIGUOUS BORED PILE WALLS - SPERW, sections: 4, 15 and 20. - Piles: Currently assumed to be continuous flight augured piles. - Diameter (minimum): 450 and 350mm but to be confirmed by contractor s design proposals. - Spacing (maximum): Submit proposals. - Guide walls: Contractor s choice. - Tolerance on concrete protrusions:. - Requirements for tolerance in addition to SPERW: refer to BP drawings. SYSTEM PERFORMANCE 210 CONTRACTOR DESIGN - Standards to be used for design: To BS 8002, BS 8004, BS 8110. - Requirement: Complete the design of embedded retaining walls and construct in accordance with SPERW, clause 11.4, option 1. - Construction: Assumed single level of propping (contractor to submit proposals). - Sequence: Assumed Top Down construction. - Embedded retaining wall layout: Refer to BP drawings. - Water resistance: Perimeter pilled wall to prevent water ingress to a manageable level during construction process only and without damage to adjacent properties. - Special requirements: Grout between piles to prevent water ingress as necessary (refer to clause 240). Design piles for a water level of 1m below existing ground level as required by BS 8102. Design life of retaining wall to be 50 years. - Site investigation: Confirm as adequate or propose further investigation as considered necessary. 225 INFORMATION TO BE PROVIDED BEFORE COMMENCING DETAILED DESIGN OF EMBEDDED RETAINING WALLS - Submittals: reports and calculations demonstrating compliance with the specification. - Confirmation of water levels and adequacy of piling system to deal with water level. - Reinforcement proposals. 227 INFORMATION TO BE PROVIDED BEFORE COMMENCING CONSTRUCTION OF EMBEDDED RETAINING WALLS - Submittals: - Information listed in SPERW, table 11.1. - Additional information:

11 - Details of piling sequence. - Confirmation that the installation of the embedded retaining wall will not damage Adjacent structures/services. - Details of size and weight and plant to be used. - Details of the method of transporting and placing concrete in the piles. - Proposals for working close to protection of adjacent facades. 230 GROUND INVESTIGATION - Report: Prepared by Chelmer Site investigations Ltd, available. - Datum for borehole logs: Refer to report. 240 ADDITIONAL GROUND INVESTIGATION - Information required: Ground water level to monitored regularly from start of contract. - Extent of investigation: - Location: Existing standpipe. - Frequency of sampling/ testing: Twice weekly. 265 LOADS ON WALLS AND EXCAVATION DEPTHS - Standards: To BS 6399-1, 2 and 3 and BS 8002 - Characteristic vertical loads: Refer to BP drawing 4925/100 - Retention loads: Calculate taking into account the following: - Soil representative strength parameters: As assessed from site investigation report. - Design ground water level: 1.0m below adjacent ground water level. - Over excavation to be assumed in front of wall: 10% as BS 8002 cl. 3.2.2.2. - Uniform surcharge loading on surface of retained soil: 10kN/m² - Additional surcharge loading: Refer to BP drawings. - Excavation depths: Refer to BP drawings. 267 LIMITS ON GROUND MOVEMENT DURING CONSTRUCTION - Movement of survey points must not exceed: - Settlement: Action values: 10mm. Trigger values: 6mm - Lateral displacement: Action values: 10mm. Trigger values: 6mm. - Movement approaching critical values: - Trigger: Submit proposals for ensuring action values are not exceeded. - Action: Stop work. 285 DAMAGE TO ADJACENT STRUCTURES AND SERVICES - Permissible damage criteria: - Structures: None. - Services: None. 290 BASIS FOR SETTING OUT - Site datum: Ordnance (Newlyn) datum. - Site grid: To be confirmed on Architect s drawings. 300 COMMENCING SURFACE - Assumed piling platform level shown on BP drawing but contractor to submit proposals. 320 WALL TOE LEVEL - Panel: All. - Cut-off level: Pile to terminate within capping beam or slab.

12 - Depth of wall toe beneath site datum (minimum): To contractor s design assumed pile lengths are shown on BP drawings but are indicative only. - Other requirements: None. 350 WATER RESTRICTING CONSTRUCTION - Proposals to be submitted by contractor. PRODUCTS 433 CAST IN PLACE PILES ALL - Fill material: Prescribed concrete. - Placing: Contractor to submit proposals as part of their method statement. - Reinforcement: To contractor s design but no less that 6T16. - Extent: For the full length of the pile projecting 600mm minimum above pile cut Off level. - Other requirements: None 470 CONCRETE GENERALLY - Standard: To BS 8500-2 and SPERW, section B19. - Project compressive strength testing of concrete:. - Exchange of information: Provide concrete producer with information required by BS 8500-1, clauses 4 and 5. 480 DESIGNED CONCRETE BY PILING CONTRACTOR - Embedded metal: Carbon steel reinforcement and structural steel. - Compression strength class (cylinder/ cube minimum): C32/40 - Target density (oven-dry): Normal. - Fibres: Not required. - Aggregates: - Size (maximum): 20 mm. - Type/ Density: Normal weight. - Coarse recycled aggregates: Not permitted. - Additional aggregate requirements: None. - Design chemical class: DC-4 (FND4) - Limiting values for composition: - Water:cement ratio (maximum): Contractor s choice. - Cement/ Combination content (minimum): Contractor s choice - Cement/ Combination content (maximum): Contractor s choice. - Air content in situ (minimum): Contractor s choice. - Consistence class: Contractor s choice. - Permitted cement/ combinations: Contractor s choice. - Chloride class: CI 0.2 - Admixtures: Submit proposals. - Additional requirements: None. 530 REINFORCEMENT GENERALLY - Steel reinforcement: To BS 4449. - Type/ Strength grade: B500B - Cutting and bending: To BS 8666. - Supplier: Firm holding a valid certificate of approval issued under a product certification scheme operated by a third party certification body with appropriate Category 2 accreditation from the United Kingdom Accreditation Service (UKAS). - Lap length (minimum): 40 x bar diameter.

13 EXECUTION 610 METHOD STATEMENT - Requirement: Submit proposed method of installation to achieve the design parameters including: - Details of equipment. - Programme showing sequence and resources. - Confirmation that performance requirements for load and settlement will be achieved. - Proximity of piling to site boundary to achieve maximum basement wall offsets as detailed on BP drawings. 615 RECORDS - Detailed requirements for records additional to those specified in SPERW: None. 655 TESTING EXCAVATED MATERIAL - Contamination tests: Undertake at following rates: - Made up ground: Submit proposals. - Other soil types: Submit proposals. 680 PROHIBITION OF SUPPORT FLUID - Usage: Not permitted. 685 EXCAVATED MATERIAL - Disposal: Contractor s responsibility. 703 COVER TO REINFORCEMENT - Cover (nominal): Submit proposals. - Method of ensuring correct cover: Submit proposals 705 MONITORING GENERALLY - Ground conditions: Observe soil and groundwater levels. - Conditions that are not in accordance with design data, including unforeseen obstructions: Report. - Ground movements: Establish measuring points in the locations and at the depths Submit proposals. - Refer to Stage Statement by BP. 740 COMPRESSIVE STRENGTH TESTING OF CONCRETE - Requirement: In addition to any sampling and testing carried out by the concrete supplier, and unless otherwise agreed, sample concrete on site and test. - Sampling rate: As SPERW section 20. 755 PREPARATION OF PILE HEADS FOR INTEGRITY TESTING - Preparation: To suit test method. - Inconsistencies which could inhibit execution or interpretation of test: Submit report. 760 INTEGRITY TESTING FOR CONTIGUOUS BORED PILE WALLS - Method: Contractor s choice. - Satisfactory evidence in support of proposals: Submit - Period between casting and testing (minimum): 7 days minimum and timing suit programme. - Piles/ walls to be tested: - Number: All. - Location: All. - Programme: Contractor s choice. 775 PERIODS FOR SUBMISSION OF INTERGRITY TEST RESULTS - Initial test results: Submit after each test within 24 hours. - Full report: Submit after completion of each phase of testing within 14 days.

14 COMPLETION 910 HEALTH AND SAFETY FILE - Walling completion report: Collate and submit a full set of records for inclusion in the health and safety file. - Number of copies: Two. - Content: - Record drawings: With each wall element numbered and giving the as built location of each relative to nearest grid lines. - Records: Copy of each record submitted during the progress of the work. - Latest date for submission: Within 14 days of completing piling works. 920 PILING GUARANTEE - Type: Insurance backed. Administered by an independent insurance protection company. - Guarantee period (minimum): 12 years. - Documentation: Provide certificates/ guarantees at completion of piling works. - Concrete where shown on drawings (to specification E10/05)

15 D50 UNDERPINNING To be read with Preliminaries/ General conditions and in conjunction with the Stage Design Statement by BP. GENERAL 115 UNDERPINNING DESIGN MASS CONCRETE UNDERPIN TO PARTY WALL - Purpose: To enable construction of capping beam at lower ground level SSL. - Extent: Refer to BP drawings - Standards: Mass concrete underpinning to BS 8004 - Requirement: - Working Loads: Not applicable. - Load factor: Not applicable. - Assumed bearing strata: London Clay. - Design proposals: Confirm as adequate for the particular ground conditions revealed in the works or submit alternatives. 115 UNDERPINNING DESIGN RC UNDERPIN TO PERIMETER WALLS (ELEVATIONS AND GABLE) - Purpose: To enable construction of capping beam at lower ground level SSL. - Extent: Refer to BP drawings - Standards: concrete underpinning to BS 8004 - Requirement: - Working Loads: Not applicable. - Load factor: Not applicable. - Assumed bearing strata: London Clay. - Design proposals: Confirm as adequate for the particular ground conditions revealed in the works or submit alternatives. 155 GROUND INVESTIGATION - Report: Chelmer SI Report available 170 DISCONNECTION OF SERVICES IN WORKING AREAS - Disconnections required: Refer to specification C20 and specification by M&E Consultant. - Timing: Before commencing underpinning works within the building. - Reconnection: Ensure that services cannot be reinstated by site operatives without consent. TYPES OF UNDERPINNING 210 CONTINUOUS MASS CONCRETE UNDERPINNING - Underpinning blocks: - Depth: Nominal 1 metre. - Length (maximum): 1 metre. - Width on either side of wall centre line (minimum): 300mm. - Depth of hard pack: 50 100mm. - Materials: - Concrete: See specification E10/105 - Hard packing: 1:3 cement: sharp sand mortar. Water content: Sufficient only to ensure that packing binds together. - Sequence: Submit proposals but no more than 25% of wall length to be unsupported at any time. Proposals to be submitted 28 days before commencement on site to enable agreement with Party Wall surveyor. - Curing periods (minimum):

16 - Between casting underpinning block and pinning up: 24 hours - Between completion of pinning up and commencement of excavation for the next sequence of underpinning: 24 hours Extend curing periods to allow for inclement weather. - Shear connection between underpinning blocks: joggle joints between adjacent stools. - Features: underpin not to project further into site than existing footing. 211 CONTINUOUS RC UNDERPINNING TO PERIMETER WALLS - Underpinning blocks: - Depth: Nominal 1 metre. - Length (maximum): 1 metre. - Width on either side of wall centre line (minimum): 300mm. - Depth of hard pack: 50 100mm. - Materials: - Concrete: See specification E10/106 - Hard packing: 1:3 cement: sharp sand mortar. Water content: Sufficient only to ensure that packing binds together. - Sequence: Submit proposals but no more than 25% of wall length to be unsupported at any time. Proposals to be submitted 28 days before commencement on site to enable agreement with Party Wall surveyor. - Curing periods (minimum): - Between casting underpinning block and pinning up: 24 hours - Between completion of pinning up and commencement of excavation for the next sequence of underpinning: 24 hours Extend curing periods to allow for inclement weather. - Shear connection between underpinning blocks: joggle joints between adjacent stools. - Features: underpin not to project further into site than existing footing. ACCESSORIES FOR UNDERPINNING 435 IN SITU CONCRETE FOR UNDERPINNING - Standard: To BS 8110-1 - Concrete: designed as specification E10/105 and 106 - Embedded metal: None. - Fibres: None. - Immature concrete: Protect from drying, frost and loading for a minimum period of 7 days. - Extend period to allow for inclement weather. - Cover to reinforcement (minimum): - Top face: not applicable. - Faces cast against not applicable. 440 MAKING CONCRETE GENERALLY - Standard: To BS 8500-2. - Exchange of information: Provide concrete producer with information required by BS 8500-1, clauses 4 and 5. 442 ADDITIONAL REQUIREMENT FOR CONCRETE QUALITY - Variation from BS 8500-1: Comply with the requirements of BRE special Digest 1 where these vary from those of BS 8500-1. 475 STEEL REINFORCEMENT GENERALLY

17 - Type/ Strength grade: 460. - Cutting and bending: To BS 8666. - Lap lengths (minimum): 40 x bar diameter. - Supplier: Firm holding a valid certificate of approval issued under a product certification scheme operated by a third party certification body with appropriate Category 2 accreditation from the United Kingdom Accreditation Service (UKAS). - Cleanliness: At time of placing concrete, reinforcement to be clean, free of corrosive pitting and loose millscale or rust. EXECUTION 610 LOOSE MASONRY/CONCRETE - Specification: test underside of existing masonry/footing for soundness by tapping with a hammer. Break out and remove any loose or unsound material to a uniform level soffit. 615 CONSTRUCTION OF MASS CONCRETE UNDERPINNING - Block and working space: Excavate together. - Formation: - Preparation: Remove or compact loose material. - Protection: Cover with 50 mm thickness of concrete if there will be a delay of more than four hours between completion of excavation and casting of concrete underpinning. - Keep excavations clean and dry. Remove all soil and loose concrete from adjacent completed pins to for a good key. - Do not excavate beyond the required width of footing at the rear. Do not excavate more working space than necessary at the front. - Split sleeves: Provide around drain/ service passing through underpinning. Closely fit a rigid sheet to each side of opening to prevent ingress of fill or vermin. - Clearance around drain/ service (minimum): 50mm. - Dowels/ Shear key/ Front shutter: Plain vertical formwork for the inner face of the underpinning with joints sealed to prevent water loss. Provide shear key via joggled joints. - Casting underpinning: In one lift, leaving a gap for packing up beneath existing foundation. - Packing: On completion of concrete curing period, hard pack gap between underpinning block and existing foundation. Pack in strips not exceeding 75mm. Allow packing to cure before commencing excavation for the next sequence of underpinning. COMPLETION 910 HEALTH AND SAFETY FILE - CONCRETE UNDERPINNING - Requirement: Collate and submit a full set of records for inclusion in the health and safety file. - Number of copies: two. - Content: For each underpinning block record: - Date of casting. - Depth of base below datum. - Length. - Width either side of wall. - Details of drains and services built into block and diameter of sleeving. - Latest date for submission: 14 days after completion.

18 E05 IN SITU CONCRETE CONSTRUCTION GENERALLY To be read with Preliminaries/ General conditions and in conjunction with the Tender Stage Design Statement by BP and design and Performance Specification for Detailing and Scheduling of Reinforced Concrete Elements. 215 CONTRACTOR DETAILING OF REINFORCEMENT - Extent: All in situ reinforced concrete structure shown on BP drawings. - Requirement: Complete the detailing and scheduling of reinforcement. - Standards: - Design: To BS 8110-1 & liaison with Pudlo/Cementaid required. - Drawings: BS EN ISO 3766 & refer to BP performance specification. - Reinforcement schedules: To BS 8666. - Design information: - Designed reinforcement: Format to design information to be agreed with contractor also refer to BP performance specification. - Additional reinforcement: Control of cracking: Provide additional reinforcement and adjust spacing of reinforcement as design standard requirements for the control of cracking. Other: None. - Reinforcement: - Order of priority when clashes occur: Raise query with BP. - Other detailing requirements: None. - Finished product: To comply with the requirements of design standard. 225 TEMPERATURE RECORDS - Requirement: Throughout period of concrete construction record: - Daily: temperature intervals at four hours. - Under adverse temperature conditions: Temperature at commencement and end of placing. - Equipment: Contractor s choice. - Location: In the shade, close to the structure. 235 OPENINGS, INSERTS AND FIXINGS - Requirement: Collate all information. - Submit: Details where openings, inserts and fixings can only be accommodated by adjustments to reinforcement. - Locate reinforcement: To ensure specified minimum cover at openings and inserts and to be clear of fixing positions. 290 ACCURACY OF CONSTRUCTION - Setting out: To BS 5964-1. - Element shape and position: The national Structural Concrete Specification for Building Construction. - Substitution of alternative requirements: None. 300 LEVELS OF STRUCTURAL CONCRETE FLOORS - Tolerances (maximum): - Level of floor: +/- 20mm. - Steps in floor level: +/- 5mm. 310 SURFACE REGULARITY OF CONCRETE FLOORS TO BS 8204 - GENERAL - Standard: To BS 8204-1 or -2. - Measurement: From underside of a 2 m straightedge (between points of contact) placed anywhere on surface and using a slip gauge. 315 SURFACE REGULARITY OF CONCRETE FLOORS TO BS 8204 - TOLERANCE CLASS SR3 - Location: Basement slab - Abrupt changes: 10mm.

19 316 SURFACE REGULARITY OF CONCRETE FLOORS TO BS 8204 - TOLERANCE CLASS SR2 - Location: All slabs above basement level. - Abrupt changes: 5mm. 430 SURFACE CRACKING GENERALLY - Method of measurement: To be proposed by contractor. - Critical crack width: 0.3mm. - Action: Should cracks occur that are wider than the critical crack width: - Survey: Frequency and extent of such cracks and investigate cause. - Report: Findings together with recommendations for rectification.

20 E10 MIXING/ CASTING/ CURING IN SITU CONCRETE To be read with Preliminaries/ General conditions and in conjunction with the Tender Stage Design Statement by BP. CONCRETE 101 SPECIFICATION - Concrete generally: To BS EN 206-1 and BS 8500-2. - Other requirements: for concrete in the ground, requirements for concrete quality in special digest 1:2005 take precedence over those in BS 8500-1. - Exchange of information: Provide concrete producer with information required by BS 8500-1, clauses 4 and 5. 105 DESIGNATED CONCRETE FOR BLINDING, MASS CONCRETE FILL & MASS CONCRETE UNDERPINNING. - Designated concrete: GEN3. - Reinforcement / embedded metal: No. - Aggregates: - Size (maximum): 20mm. - Coarse recycled aggregates: RCA Permitted. - Additional aggregate requirements: None. - Consistence class: S3. - Chloride class: 1.0. - Admixtures: None. - Additional mix requirements: None. 106 DESIGNATED CONCRETE FOR ALL RC UNDERPINNING AND RETAINNING WALLS. - Designated concrete: RC32/40 - Reinforcement / embedded metal: YES. - Aggregates: - Size (maximum): 20mm. - Other requirements for admixtures: An accelerator or retarder may be used. 107 DESIGNATED CONCRETE FOR ALL SLABS AND WALLS/COLUMNS NOT IN CONTACT WITH GROUND PILES - Designated concrete: RC32/40 - Reinforcement / embedded metal: YES. - Aggregates: - Size (maximum): 20mm. - Other requirements for admixtures: An accelerator or retarder may be used. 125 SUBSTITUTION OF STANDARDIZED PRESCRIBED CONCRETE FOR DESIGNATED CONCRETE - General: Conform to BS 8500-2, clause 8. - Substitution: In accordance with BS 8500-1, table A. 13. - Proposals: Submit for each substitution, stating reasons. - Site mixing: If standardized prescribed concretes are made on site conform to BS 8000-2.1, subsections 2, 3 and 4. 132 DESIGNED CONCRETE FOR BASEMENT SUBSTRUCTURE CONCRETE WITH WATERPROOF ADDITIVE - Reinforcement / Embedded metal: Yes. - Compressive strength class (cylinder/ cube minimum): C40/50. - Target density (oven-dry): Normal - Aggregates: - Size (maximum): 20mm - Type/ Density: Normal weight.

21 - Coarse recycled aggregates: RCA Permitted subject to acceptance by the waterproof additive manufacturer (see below) - Additional aggregate requirements: None. - Design chemical class: AC-1. - Limiting values for composition: - Water/cement ratio (maximum): 0.45. - Cement/ combination content (minimum): In accordance with the waterproof additive manufacturer s requirements. - Cement/ combination content (maximum): In accordance with the waterproof additive manufacturer s requirements. - Air content in situ (minimum): No requirement. - Consistence class: Contractor s choice / In accordance with the waterproof additive manufacturer s requirements. - Permitted cement/ combinations: II subject to waterproof additive manufacturer s requirements. - Chloride class: 0.4. - Admixtures: Waterproof additive by Pudlo/Cementaid or similar approved; other admixtures permitted subject to selected waterproof additive manufacturer s approval. - Colour: Not required. - Additional mix requirements: None. MATERIALS, BATCHING AND MIXING 215 READY-MIXED CONCRETE - Production plant: Currently certified by a body accredited by UKAS to BS EN 45011 for product conformity certification of ready-mixed concrete. - Source of ready-mixed concrete: Obtain from one source if possible. Otherwise, submit proposals. - Name and address of depot: Submit before any concrete is delivered. - Delivery notes: Retain for inspection. - Declarations of nonconformity from concrete producer: Notify immediately. 218 SITE MIXED CONCRETE - Batching by mass: - Restrictions: Limit to mass concrete underpin, mass fill & blinding. - Accuracy of measuring devices: To BS EN 206-1, clause 9.6.2.2. Tolerances for quantity of constituent material: To BS EN 206-1, table 21. - Batching by volume: - Restrictions: None. - Mixing: To BS 8000-2.1, subsections 2, 3 and 4. 221 INFORMATION ABOUT PROPOSED CONCRETES - Submit when requested: - Details listed in BS 8500-1, clause 5.2. - Additional information: None. 225 CHANGES TO SPECIFICATION - Changes to specification of fresh concrete (outside concrete producer's responsibility): Prohibited. 230 INTERRUPTION OF SUPPLY DURING CONCRETING - Elements without joints: Where elements are detailed to be cast in a single pour without joints, make prior arrangements for a back-up supply of concrete. - Elsewhere: - Preparation: Manage pour to have a full face, and have materials available to form an emergency construction joint while concrete can still be worked. - Before pour is completed: Submit location and details of joint, make proposals for joint preparation.

22 310 RECYCLED AGGREGATE - Standard: To BS 8500-2, clause 4.3 - Type: Submit proposals. - Source: Submit proposals. 415 ADMIXTURES - Calcium chloride and admixtures containing calcium chloride: Do not use. 418 PROPRIETARY ADMIXTURE - Type: Superplaster SR and Everdue Caltite. - Manufacturer: Cementaid. - Special requirements: To be used strictly in accordance with manufacturer s instructions. 490 PROPERTIES OF FRESH CONCRETE - Adjustments to suit construction process: Determine with concrete producer. Maintain conformity to the specification. PROJECT TESTING/ CERTIFICATION 505 PROJECT TESTING OF CONCRETE - Purpose: No tests required for designated concrete but compressive strength testing is required for designed and prescribed mixes - Testing: To BS EN 206-1, Annex B and BS 8500-1, Annex B. - Nonconformity: Obtain instructions immediately. - Recording: Maintain complete correlated records including: - Concrete designation. - Sampling, site tests, and identification numbers of specimens tested in the laboratory. - Location of the parts of the structure represented by each sample. - Location in the structure of the batch from which each sample is taken. - Tests: - Sampling: One sample per 20m³. 508 REGULAR PROJECT TESTING - Tests: Compressive strength. - Sampling: - Point: At point of placing. - Rate: one sample per 20m³. - Other requirements: None. 520 TESTING LABORATORY - Laboratory: Accredited by UKAS or other national equivalent. - Name and UKAS reference number: Submit well in advance of making trial mixes or concrete for use in the works. 530 TESTS RESULTS - Submission of reports: Within one day of completion of each test. - Number of copies: one. - Reports on site: A complete set, available for inspection. 550 BROKEN CUBES FROM FAILED STRENGTH TESTS - Nonconformity: Keep separately the pieces of each cube which fail to meet the conformity requirements for individual results. - Period for keeping cubes: Obtain instructions.

23 PLACING/ COMPACTING/ CURING AND PROTECTING 610 CONSTRUCTION/ SEQUENCE/ TIMING REQUIREMENTS - Maximum pour sizes to be in accordance with Cementaid requirements. - Contractor to submit sequence proposals as part of their method statement. 620 TEMPERATURE OF CONCRETE - Application: basement raft slab. - Objective: Limit maximum temperature of concrete to minimize cracking during placing, compaction and curing. Take account of: - High temperatures and steep temperature gradients: Prevent build-up during first 24 hours after casting. Prevent coincidence of maximum heat gain from cement hydration with high air temperature and/ or solar gain. - Rapid changes in temperature: Prevent during the first seven days after casting. - Proposals for meeting objective: Submit. 630 PREMATURE WATER LOSS - Requirement: Prevent water loss from concrete laid on absorbent substrates. - Underlay: Select from: Polyethylene sheet: 250 micrometres thick. Building paper: To BS 1521, grade B1F. - Installation: Lap edges 150 mm. - Refer also to requirements by Cementaid Ltd for Caltite concrete surfaces. 640 CONSTRUCTION JOINTS - Location of joints: To be part of contractor s method statement. - Preparation of joint surfaces: Remove surface laitance and expose aggregate by lightly brushing and spraying. Joint surface to be clean and damp immediately before placing fresh concrete. 648 ADVERSE TEMPERATURE CONDITIONS - Requirement: Submit proposals for protecting concrete when predicted ambient temperatures indicate risk of concrete freezing or overheating. 650 SURFACES TO RECEIVE CONCRETE - Cleanliness of surfaces immediately before placing concrete: Clean with no debris, tying wire clippings, fastenings or free water. 660 INSPECTION OF SURFACES - Notice: Give notice to allow inspections of reinforcement and surfaces before each pour of concrete. - Period of notice: 24 hours. - Timing of inspections: When fixing of reinforcement is complete. 670 TRANSPORTING - General: Avoid contamination, segregation, loss of ingredients, excessive evaporation and loss of workability. Protect from heavy rain. - Entrained air: Anticipate effects of transport and placing methods in order to achieve specified air content. 680 PLACING - Records: Maintain for time, date and location of all pours. - Timing: Place as soon as practicable after mixing and while sufficiently plastic for full compaction.

24 - Temperature limitations for concrete: 30 C (maximum) and 5 C (minimum), unless otherwise specified. Do not place against frozen or frost covered surfaces. - Continuity of pours: Place in final position in one continuous operation up to construction joints. Avoid formation of cold joints. - Discharging concrete: Prevent uneven dispersal, segregation or loss of ingredients or any adverse effect on the formwork or formed finishes. - Thickness of layers: To suit methods of compaction and achieve efficient amalgamation during compaction. - Poker vibrators: Do not use to make concrete flow horizontally into position, except where necessary to achieve full compaction under void formers and cast-in accessories and at vertical joints. 690 COMPACTING - General: Fully compact concrete to full depth to remove entrapped air. Continue until air bubbles cease to appear on the top surface. - Areas for particular attention: Around reinforcement, under void formers, cast-in accessories, into corners of formwork and at joints. - Consecutive batches of concrete: Amalgamate without damaging adjacent partly hardened concrete. - Methods of compaction: To suit consistence class and use of concrete. 720 VIBRATORS - General: Maintain sufficient numbers and types of vibrator to suit pouring rate, consistency and location of concrete. - External vibrators: Obtain approval for use. 730 PLASTIC SETTLEMENT - Settlement cracking: Inspect fresh concrete closely and continuously wherever cracking is likely to occur, including the top of deep sections and at significant changes in the depth of concrete sections. - Timing: During the first few hours after placing and whilst concrete is still capable of being fluidized by the vibrator. - Removal of cracks: Revibrate concrete. 810 CURING GENERALLY - Requirement: Keep surface layers of concrete moist throughout curing period, including perimeters and abutments, by either restricting evaporation or continuously wetting surfaces of concrete. - Surfaces covered by formwork: Retain formwork in position and, where necessary to satisfy curing period, cover surfaces immediately after striking. - Top surfaces: Cover immediately after placing and compacting. If covering is removed for finishing operations, replace it immediately afterwards. - Surface temperature: Maintain above 5 C throughout the specified curing period or four days, whichever is longer. - Records: Maintain details of location and timing of casting of individual batches, removal of formwork and removal of coverings. Keep records on site, available for inspection. 811 COVERINGS FOR CURING - Sheet coverings: Suitable impervious material. - Curing compounds: Selection criteria: - Curing efficiency: Not less than 75% or for surfaces exposed to abrasion 90%. - Colouring: Fugitive dye. - Application to concrete exposed in the finished work: Readily removable without disfiguring the surface. - Application to concrete to receive bonded construction/ finish: No impediment to subsequent bonding. - Interim covering to top surfaces of concrete: Until surfaces are in a suitable state to receive coverings in direct contact, cover with impervious sheeting held clear of the surface and sealed against draughts at perimeters and junctions.

25 812 PREVENTING EARLY AGE THERMAL CRACKING - Deep lifts or large volume pours: Submit proposals for curing to prevent early age thermal cracking, taking account of: - Temperature differentials across sections. - Coefficient of thermal expansion of the concrete. - Strain capacity of the concrete mix (aggregate dependent). - Restraint. 815 ADDITIONAL CURING REQUIREMENT WATER CURING - Commencement of water curing: As soon as practicable after placing and compacting concrete. - Surfaces covered by formwork: Expose to water curing as soon as practicable. - Top surfaces: Cover immediately with impermeable sheeting to prevent evaporation before commencement of water curing. - Water curing: Wet surfaces continuously throughout curing period. - Select methods from: Mist spray. Wet hessian covered with impermeable sheeting. 820 CURING PERIODS - General: Curing periods are in days (minimum). - Definition of t : The average number of degrees Celsius air temperature during the curing period. - Curing periods for concrete surfaces which, in the finished building, will be exposed to the elements; concrete wearing surface floors and pavements; water resistant concrete: Drying winds or dry, sunny weather (relative humidity <50%) Intermediate conditions Concrete made using CEM1 strength class 42.5 or 52.5; SRPC (BS 4027) Concrete made using cements indicated in BS 8500, table A.17 except those listed in adjacent column and supersulfated cement Damp weather, protected from sun and wind (relative humidity > 80%) Curing Periods for other structural concrete surfaces (cements/combinations as above): Drying winds or dry, sunny weather (relative humidity <50%) Intermediate conditions Damp weather protected from No special requirements No special requirements sun and wind (relative humidity > 80%) Curing periods for concretes using admixtures or other types of cements/combinations: Submit proposals. 840 PROTECTION - Prevent damage to concrete, including: - Surfaces generally: From rain, indentation and other physical damage. - Surfaces to exposed visual concrete: From dirt, staining, rust marks and other disfiguration. - Immature concrete: From thermal shock, physical shock, overloading, movement and vibration. - In cold weather: From entrapment and freezing expansion of water in pockets, etc.

26 E20 FORMWORK FOR IN SITU CONCRETE To be read with Preliminaries/ General conditions and in conjunction with the Tender Stage Design Statement by BP. GENERALLY/ PREPARATION 110 LOADINGS - Requirement: Design and construct formwork to withstand the worst combination of the following: - Total weight of formwork, reinforcement and concrete. - Construction loads including dynamic effects of placing, compacting and construction traffic. - Wind and snow loads. 120 FORMWORK DETAILS - Provide the following: - Positions and types of construction joints. - Means of sealing panel joints, form tie holes and at construction joints. 132 PROPPING - General: Prevent deflection and damage to the structure. Carry down props to bearings strong enough to provide adequate support throughout concreting operations. - Method statement: Submit proposals for prop bearings and sequence of propping/ repropping and backpropping. - Timing of submission: To be agreed between the permanent works designer and the temporary works coordinator. 160 CAMBERS - Application of specified upward cambers: To the concrete immediately before formwork is struck. - Formwork: Allow for deflection under weight of fresh concrete. - Top surfaces of concrete: Camber to maintain the required structural depths and profiles. - Checks after striking of formwork and removal of props: Levels to determine extent of any residual camber. Submit results. - Upward cambers: Construct forms to achieve the following: - slabs with spans greater than 3m: 0.1% of span measured at centre. 170 WORK BELOW GROUND - Casting vertical faces of footings, bases and slabs against faces of excavation: Obtain consent. - Casting walls against faces of excavation: Use formwork on both sides. CONSTRUCTION 310 ACCURACY - General requirement for formwork: Accurately and robustly constructed to produce finished concrete in the required positions and to the required dimensions. - Formed surfaces: Free from twist and bow (other than any required cambers). - Intersections, lines and angles: Square, plumb and true. 320 JOINTS IN FORMS - Requirements including joints in form linings and between forms and completed work: - Prevent loss of grout, using seals where necessary. - Prevent formation of steps. Secure formwork tight against adjacent concrete. 330 INSERTS, HOLES AND CHASES - Positions and details: - Dimensioned on drawings provided on behalf of the Employer: Do not change without consent. - Undimensioned or from other sources: Submit proposals.

27 - Positioning relative to reinforcement: Give notice of any conflicts well in advance of placing concrete. - Method of forming: Fix inserts or box out as required. Do not cut hardened concrete without approval. 340 KICKERS - Method statement: Submit proposals including means of achieving quality of concrete consistent with that specified for the column or wall. - Kicker height: 150mm 350 FORM TIES - Metal associated with form ties/ devices: Prohibited within cover to reinforcement. Compatible with reinforcement metal. 361 FORM TIES FOR WATER RESISTANT CONCRETE - General: Maintain water resistance of construction. - Tie type and sealing system: refer to Cementaid standard details. 470 RELEASE AGENTS - General: Achieve a clean release of forms without disfiguring the concrete surface. - Product types: Compatible with formwork materials, specified formed finishes and subsequent applied finishes. Use the same product throughout the entire area of any one finish. - Protection: Prevent contact with reinforcement, hardened concrete, other materials not part of the form face, and permanent forms. 480 SURFACE RETARDERS - Use: Obtain approval. - Reinforcement: Prevent contact with retarder. 490 PROPRIETARY LINING MATERIAL FOR EXPOSED UNDERPIN SURFACES BENEATH RETAINED FACADE - 5mm thick Correx by Cordek or similar approved - Face of underpinning to be broken back where necessary to an even line to ensure that Correx sheeting will not deform when containing the weight of wet concrete. STRIKING 510 STRIKING FORMWORK - Timing: Prevent any disturbance, damage or overloading of the permanent structure. 521 MINIMUM PERIOD FOR RETAINING FORMWORK/ TEMPORARY SUPPORTS IN POSITION - Determination of minimum periods for retaining formwork in position: Method of assessing strength of slabs and columns prior to loading: submit proposals. FORMED FINISHES 620 PLAIN SMOOTH FINISH ALL CAST SURFACES - Finish: Even with panels arranged in a regular pattern as a feature of surfaces to be left exposed in the permanent condition. - Permissible deviation of surfaces: - Sudden irregularities (maximum): 5 mm. - Gradual irregularities (maximum): 5 mm, when measured from the underside of a 1 m straightedge, placed anywhere on surface. - Variations in colour: - Permitted: Those caused by impermeable formwork linings. - Not permitted: Those caused by contamination or grout leakage. - Surface blemishes: - Permitted: Blowholes less than 10 mm in diameter and at an agreed frequency. - Not permitted: Voids, honeycombing, segregation and other large defects. - Formwork tie holes: In a regular pattern and filled with matching mortar.

28 E30 REINFORCEMENT FOR IN SITU CONCRETE To be read with Preliminaries/ General conditions and in conjunction with the Tender Stage Design Statement by BP. REINFORCEMENT 110 QUALITY ASSURANCE OF REINFORCEMENT - Standards: - Reinforcement: To BS 4449, BS 4482, BS 4483 or BS 6744. - Cutting and bending: To BS 8666. - Source of reinforcement: Companies holding valid certificates of approval for product conformity issued by the UK Certification Authority for Reinforcing Steels (CARES). 150 RIBBED BAR REINFORCEMENT - Standard: To BS 4449. - Strength grade:b500b. WORKMANSHIP 310 CUTTING AND BENDING REINFORCEMENT - General: To schedules and to BS 8666. - Bending on site, including minor adjustments: Not permitted. 320 PROTECTION OF REINFORCEMENT - Dropping from height, mechanical damage and shock loading: Prevent. - Cleanliness of reinforcement at time of pouring concrete: Free from corrosive pitting, loose millscale, loose rust and contaminants which may adversely affect the reinforcement, concrete, or bond between the two. 410 LAPS OR SPLICES - Details not shown on drawings: Obtain instructions. 425 LAPS NOT DETAILED ON DRAWINGS - Laps in bar reinforcement (minimum): 40 x bar diameter. - Laps in fabric reinforcement (minimum): 40 x bar diameter - Laps at corners: Avoid four layer build-up. 451 FIXING REINFORCEMENT - Standard: To BS 7973-1 and -2. - Installation: In addition to any spacers and chairs shown on drawings or schedules, provide adequate support, tie securely and maintain the specified cover. - Tying: - Wire type: 16 gauge black annealed. Use stainless steel wire for stainless steel reinforcement. - Ends of tying wire: Prevent intrusion into the concrete cover. Remove loose ends. - Compatibility of metals: Prevent contact between ordinary carbon steel and stainless or galvanized reinforcement. 470 TOLERANCES ON COVER - Definition of nominal cover to BS 8500-1: Minimum cover plus tolerance for fixing. - Tolerance (maximum): walls and slabs 10mm. - Checking specified cover dimensions: Before concreting check that cover dimensions will be achieved. 480 NOMINAL COVER TO REINFORCEMENT - Top face: 30mm. - Formed faces: 30mm.

29 E41 WORKED FINISHES TO IN SITU CONCRETE To be read with Preliminaries/ General conditions and in conjunction with the Tender Stage Design Statement by BP. 150 FINISHING - Timing: Carry out at optimum times in relation to setting and hardening of concrete. - Prohibited treatments to concrete surfaces: - Wetting to assist surface working. - Sprinkling cement. 310 SMOOTH FLOATED FINISH - Surface on completion: Even with no ridges or steps.

30 G10 STRUCTURAL STEEL FRAMING To be read with Preliminaries/ General conditions and in conjunction with the Tender Stage Design Statement by BP. GENERAL REQUIREMENTS/ INFORMATION 110 DESIGN - Design standard: The structural steelwork has been designed to BS 5950 where applicable. - Steel grades: All steel to be of grade S275J0 (open sections); S275J0H (hollow sections) unless noted specifically in places at S355. - Completion of design: Design and detail connections to BS 5950. - Loading requirements: As specified or otherwise calculable. - Design parameters: Refer to drawings and to the Structural Engineer s Design Statement. 115 DESIGN CONSTRAINTS GENERAL - Members forming bracing systems or girders of lattice construction: Unless detailed or instructed otherwise, position so that their lines of action intersect at a point. - Bolts: - Grade: 8.8. - Diameter (minimum): 16. - Number per connection (minimum): 2. - Welds: Full profile fillet welds, minimum 6mm. 120 DRAWINGS AND CALCULATIONS - Requirement: Before preparing detailed fabrication drawings, submit: - General arrangement drawings with individual steel members clearly identified. - Calculations for major connections. 125 SPECIFICATION STANDARD - Standard: Comply with latest edition of National Structural Steelwork Specification (NSSS). - Document availability: Make available during the course of the Works at fabrication shop and on site. FABRICATION 180 NOTIFICATION OF COMMENCEMENT - Notice: Give notice before fabrication is due to start. - Period of notice (minimum): 10 working days. 190 MARKING - Identifying and recording materials and components: Submit details of proposed methods. - Location of marks: - Generally: Visible for checking after erection. - Weathering steel: On surfaces not exposed to open view in the completed work. - Steel to be blast cleaned, pickled, metal sprayed or galvanized: Marked so that subsequent treatment cannot obliterate the marking. 195 HARD STAMPING - Usage: Not permitted except as indicated on drawings. 200 FAYING SURFACES FOR HIGH-STRENGTH FRICTION GRIP (HSFG) JOINTS - Steel 25 mm thick or over: Check faying surfaces for deformities that may reduce slip factor to below design limit.

31 - Remedial measures: Submit proposals. 225 STEELWORK TO BE GALVANIZED - Cutting, drilling and shop welding: Complete before galvanizing. - Vent and drain holes: Provide as necessary. - Locations: Submit proposals. - Sealing: Not required. WELDING 255 SITE WELDING - Usage: Permitted only where indicated on drawings. - Working conditions: Suitable and safe. Do not weld when surfaces are wet or when ambient temperature is below 0 C. 270 ADDITIONAL WELDS - Welds (including tack welds) not indicated on drawings: Not permitted without approval. 290 FINISHED WELDS - Finished welds: Carefully dressed to remove slag without deforming surface of weld. BOLT ASSEMBLIES 305 BOLT AND NUT ASSEMBLIES - Type: Holding down. - Manufacturer: To be proposed by the Contractor. 310 BOLT AND NUT ASSEMBLIES - Type: Turnbuckles. - Manufacturer: Macalloy - Product reference: TA16 325 DIRECT TENSION INDICATORS - Standard: To BS 7644-1. - Manufacturer: To be proposed by the Contactor. - Grade: Appropriate for grade of bolt and nut assembly. - Ancillary components: Washers to BS 7644-2. Used as recommended to BS 7644-1, Annex A. - Post installation and inspection treatment: Where no further protective coating is specified, apply a butyl rubber sealing compound to seal measuring gap around indicators. 335 SPRING WASHERS - Standard: To BS 4464. 370 GALVANIZED COATING TO BOLT ASSEMBLIES - Standard: To BS 7371-6. - Galvanizing: Applied by fastener manufacturer. Passivated and lubricated if no additional coatings are specified. Nuts tapped after galvanizing. - Use/ location: All bolts unless noted otherwise. 390 SEALED HOLLOW SECTIONS - Bolt Holes: Sealed to prevent access of moisture. - Method of sealing: Submit Proposals.

32 ERECTION 410 PRE-ERECTION CHECKS - Scope: At least 7 days before proposed erection start date, check the following: - Foundations and other structures to which steelwork will be attached: Accuracy of setting out. - Holding down bolts: Position, protruding length, slackness and condition. - Inaccuracies and defects: Report without delay. - Permission to commence erection: Obtain. 420 SETTING OUT - Permissible deviations: In addition to the requirements of the NSSS and NSSS CE Marking version, comply with the following: No additional requirements. 425 MODIFICATIONS - Steelwork: Do not modify without approval. 432 TEMPORARY SUPPORT - Elements to be supported: roof to be restrained against racking before joists and plan bracing is installed. Columns to be laterally restrained until is installed and tightening completed. - Bracing/Restraints: Provide as necessary until permanent connections can be made. - Forces and moments in elements: Make independent assessment. 440 COLUMN BASES - Levels: Adjust using steel shims or folding wedges no larger than necessary. - Location of shims/ wedges: Position symmetrically around perimeter of base plate. Do not use a single central pack. - Give notice: If space beneath any column base is outside specified limits for bedding thickness. - Accuracy of erection: Check, and correct errors before filling and bedding beneath bases and carrying out other adjacent work. 443 PROPRIETARY FILLING/ BEDDING OF COLUMN BASES - Preparation: Concrete surfaces scarified to provide a good mechanical key. - Bolt pockets and spaces beneath base plates: Completely filled with SBD Five Star Grout or similar approved. 445 MOVEMENT JOINTS - Sliding surfaces: Coated with molybdenum disulphide grease before connecting. - Appearance and fit: Bolts centred in slotted holes. Joints free to move. TESTING 465 TESTING - Testing: Arrange the following tests. Prepare test pieces as necessary. Visual Inspection, Magnetic particle inspection (MPI) Ultrasonic test (U/S), Testing authority: UKAS accredited laboratory: Sandberg or other subject to approval. Frequency/Number: Refer to NSSS table 1 470 SITE TESTING OF ANCHORS TO MASONRY - Standard: To BS 5080. - Preliminary tests: 5No. for tensile loading failure evenly spread across existing façade. - Proof tests: test 25% of working fixings to 1.5 times the working load. - Test results: Report failures and seek instructions.

33 PROTECTIVE COATINGS 510 SURFACES NOT TO BE COATED - None. 521 ALTERNATIVE MANUFACTURERS - Short list of manufacturers: Obtain coating materials from: - W.J. Leigh & Co Paints or submit details of alternative manufacturer for approval. - Selected manufacturer: Submit details before ordering materials. 535 INSPECTION OF COATING WORK - Work in progress: Permit coating manufacturer to inspect and take samples of products. - Notice: Give notice of dates for: - Start of surface preparation and coating. - Coated members or components leaving the works. - Period of notice (minimum): 5 working days. PROTECTIVE COATING SYSTEMS 638 SHOP PRIMING FOR ALL STEELWORK EMBEDDED WITHIN EXTERNAL MASONRY WALLS - Paint manufacturer: W J Leigh & Co Ltd. - Shop preparation: - Generally: Blast cleaning to BS EN ISO 8501-1, preparation grade Sa2 - Shop primer: Two-pack epoxy zinc phosphate primer, C400V2. - Dry film thickness: 200µm in a single coat. - Special requirements: Steelwork face must be a minimum of 40mm away from internal face of the external brick leaf. 640 SHOP PAINTING WITH PRIMER ALL OTHER STEELWORK - Paint manufacturer: W J Leigh & Co Ltd. - Shop preparation: - Generally: Blast cleaning to BS EN ISO 8501-1, preparation grade Sa2 - Shop primer: Two-pack epoxy zinc phosphate primer, C400V2. - Dry film thickness: 75µm in a single coat. - Special requirements: None. PREPARATION FOR PAINTING 710 OFFSITE PREPARATION AND PAINTING - Working area: Covered and properly lit, heated and ventilated. - Sequence of working: Select from the following and submit proposals: - Fabricate, blast clean, prime. - Blast clean, fabricate, remove flash rust with a light overall sweep blast, prime. - Blast clean, apply weldable prefabrication primer, fabricate, prime. - Prefabrication primer (option 3): Type recommended by manufacturer of post fabrication primer. - Thickness of post fabrication primer coat: May be reduced if and as recommended by manufacturer. - Surfaces inaccessible after assembly: Apply full treatment and coating system including, if necessary, local application of site coatings. 725 MANUAL CLEANING OF NEW STEELWORK - Preparation: Remove fins, burrs, sharp edges, weld spatter, loose rust and loose scale. - Surface finish: Clean but unpolished to BS EN ISO 8501-1, grade St 2.

34 - Finishing: Thoroughly degrease and clean down. Remove any consequent rusting back to grade St 2. Prime without delay. 730 PREPARATION FOR SITE WELDING OF SHOP PAINTED STEELWORK - Method: Select from the following: - Mask weld areas immediately after blast cleaning and before coating steelwork. If paint system comprises more than one coat, step each coat 30 mm back from edge of preceding coat and away from masked areas. Remove masking immediately before welding. - Prepare and paint steelwork including weld areas. Grind off to bare steel around each weld area immediately before welding. 735 TREATMENT OF SITE WELDED JOINTS IN PAINTED STEELWORK - Preparation: After welding, and without delay, remove scale and weld spatter from weld areas. Remove traces of rust. Wash with clean water and allow to dry. Prime without delay. - Protective/ Decorative coatings: Apply to weld areas to match surrounding painted areas. 736 TREATMENT OF SITE WELDED JOINTS IN GALVANIZED STEELWORK - Preparation: After welding, and without delay, remove scale and weld spatter from weld areas. Remove traces of rust. Wash with clean water and allow to dry. - Coating: Reinstate using one of the methods given in BS EN ISO 1461, clause 6.3. 740 BOLTED JOINTS (OTHER THAN FRICTION GRIP JOINTS) - Steelwork to be shop painted: Apply full shop specification to joint faces. - Steelwork to be erected with mill finish then site painted: Before erection, prepare and prime joint faces and allow to dry. - Bolted joints in externally exposed steelwork: - Immediately before assembling, apply a further coat of primer and bring surfaces together while still wet. - After assembling and before applying site coatings, seal crevices to bolts and joint perimeters with a compatible sealant. 745 FAYING SURFACES OF FRICTION GRIP JOINTS - Protection: Immediately after blast cleaning and before coating surrounding areas, mask faying surfaces to protect from contamination and deterioration. - Paint systems comprising more than one coat: Step each coat 30 mm back from edge of preceding coat and away from masked areas. - Removal of protection: Immediately before bolting, remove masking. Check faying surfaces are free from adhesive. Clean with solvent if necessary. 750 FRICTION GRIP JOINTS IN SHOP PAINTED STEELWORK - Post assembly treatment of bolts and surrounding areas: After final tightening of bolts and inspection of joints: - Thoroughly degrease and clean uncoated areas including bolts. - Prime without delay. - Apply full shop coating specification. - Direct tension indicators: Seal measuring gap to prevent ingress of moisture. 755 UNCOATED FASTENERS - Treatment: After steelwork erection and before applying site coatings, thoroughly degrease and clean. Without delay, coat to match adjacent shop painted areas. 760 GALVANIZED FASTENERS - Treatment: After steelwork erection and before applying site coatings, thoroughly degrease and clean. Etch prime. 765 SITE PREPARATION OF SHOP PAINTED STEELWORK

35 - Preparation: Touch in shop coats, as necessary, and allow to dry. Before applying site coats (when specified), abrade surfaces or wash down or both, as recommended by paint manufacturer. 770 SITE PREPARATION OF GALVANIZED SURFACES FOR PAINTING - Preparation: Thoroughly degrease. Remove white corrosion products. Wash off and allow to dry before applying etching wash or primer. PAINTING 810 ENVIRONMENTAL CONDITIONS - General requirements prior to starting coating work: - Surfaces: Unaffected by moisture or frost. - Steel temperature: At least 3 C above dew point, with conditions stable or improving, and not high enough to cause blistering or wrinkling of the coating. - Relative humidity: Below 85%. 815 COATINGS - Surfaces to be coated: Clean, dust free and suitably dry. Previous coats to be adequately cured. - Multiple coats of same material: Use different tints to assist checking of complete coverage. - Penultimate coat: Colour recommended by paint manufacturer to suit top coat colour. - Finish required: Smooth and even, of uniform thickness and colour, free from defects. 820 FILM THICKNESS - Wet film thickness: During application, check thickness of each coat with a wheel or comb gauge used in accordance with BS EN ISO 2808. - Accumulated dry film thickness: After each coat has dried, check total accumulated film thickness. - Method: Magnetic or electromagnetic meter. - Number and position of measurements: As directed. - Validation: Measurements to be independently witnessed. - Meter calibration: Check against standard shims and recalibrate regularly against a smooth steel reference plate. - Average dry film thickness: - At least specified thickness over any square metre. - No reading to be less than 75% of specified thickness. - Top coat dry film thickness: Sufficient to give an even, solid, opaque appearance. 825 STRIPE COAT - External angles, nuts, bolt heads, rough weld seams, and areas difficult to coat: Apply an additional stripe coat of primer.

36 G20 CARPENTRY/ TIMBER FRAMING/ FIRST FIXING To be read with Preliminaries/ General conditions and in conjunction with the Tender Stage Design Statement by BP. GENERAL 105 TIMBER PROCUREMENT - Timber (including timber for wood based products): Obtained from well managed forests/ plantations in accordance with: - The laws governing forest management in the producer country or countries. - International agreements such as the Convention on International Trade in Endangered Species of wild fauna and flora (CITES). - Documentation: Provide either: - Documentary evidence (which has been or can be independently verified) regarding the provenance of all timber supplied, or - Evidence that suppliers have adopted and are implementing a formal environmental purchasing policy for timber and wood based products. 150 STRENGTH GRADING OF TIMBER - Grader: A company currently registered under a third party quality assurance scheme operated by a certification body approved by the UK Timber Grading Committee. 160 GRADING AND MARKING OF SOFTWOOD - Timber of a target/ finished thickness less than 100 mm and not specified for wet exposure: Graded at an average moisture content not exceeding 20% with no reading being in excess of 24% and clearly marked as DRY or KD (kiln dried). - Timber graded undried (green) and specified for installation at higher moisture contents: Clearly marked as WET or GRN. - Structural timber members cut from large graded sections: Regraded to approval and marked accordingly. PRODUCTS 210 STRUCTURAL SOFTWOOD (GRADED DIRECT TO STRENGTH CLASS) - Grading standard: To BS 4978, BS EN 14081-1, or other national equivalent and so marked. - Strength class to BS EN 338: C24. - Treatment: - Standard: To NBS section Z12 and British Wood Preserving and Damp-proofing Association Commodity Specification C8. - Type: CCB impregnation such as Celcure AC500 by Osmose (Protim Solignum Ltd), Tanalith E by Arch, or similar approved. - Moisture content at time of erection: As clause 450. WORKMANSHIP GENERALLY 401 CROSS SECTION DIMENSIONS OF STRUCTURAL SOFTWOOD AND HARDWOOD - Dimensions: Dimensions in this specification and shown on drawings are target sizes as defined in BS EN 336. - Tolerances: The tolerance indicators (T1) and (T2) specify the maximum permitted deviations from target sizes as stated in BS EN 336, clause 4.3: - Tolerance class 1 (T1) for sawn surfaces. - Tolerance class 2 (T2) for further processed surfaces.

37 420 WARPING OF TIMBER - Bow, spring, twist and cup: Not greater than the limits set down in BS 4978 or BS EN 14081-1 for softwood, or BS 5756 for hardwood. 430 SELECTION AND USE OF TIMBER - Timber members damaged, crushed or split beyond the limits permitted by their grading: Do not use. - Notches and holes: Position in relation to knots or other defects such that the strength of members will not be reduced. - Scarf joints, finger joints and splice plates: Do not use without approval. 440 PROCESSING TREATED TIMBER - Cutting and machining: Carry out as much as possible before treatment. - Extensively processed timber: Retreat timber sawn lengthways, thicknessed, planed, ploughed, etc. - Surfaces exposed by minor cutting/ drilling: Treat with two flood coats of a solution recommended by main treatment solution manufacturer. 450 MOISTURE CONTENT - Moisture content of wood and wood based products at time of installation: Not more than: - Covered in generally unheated spaces: 24%. - Covered in generally heated spaces: 20%. - Internal in continuously heated spaces: 20%. 451 MOISTURE CONTENT TESTING - Procedure: When instructed, test timber sections with an approved electrical moisture meter. - Test sample: Test 5% but not less than 10 lengths of each cross-section in the centre of the length. - Test results: 90% of values obtained to be within the specified range. Provide records of all tests. 510 PROTECTION - Generally: Keep timber dry and do not overstress, distort or disfigure sections or components during transit, storage, lifting, erection or fixing. - Timber and components: Store under cover, clear of the ground and with good ventilation. Support on regularly spaced, level bearers on a dry, firm base. Open pile to ensure free movement of air through the stack. - Trussed rafters: Keep vertical during handling and storage. 520 EXPOSED END GRAIN - Components: Seal exposed end grain of the following before delivery to site: Suitable end grain sealer. - Sealer: TBA by contractor. JOINTING TIMBER 570 JOINTING/ FIXING GENERALLY - Generally: Where not specified precisely, select methods of jointing and fixing and types, sizes and spacings of fasteners in compliance with section Z20. 670 ANTI-CORROSION FINISHES FOR FASTENERS - Galvanizing: To BS 7371-6, with internal threads tapped and lightly oiled following treatment. - Sherardizing: To BS 7371-8, Class 1. - Zinc plating: To BS EN ISO 4042 and passivated. - Treatment not specified: Select from the above to suit service conditions.

38 ERECTION AND INSTALLATION 760 TEMPORARY BRACING - Provision: As necessary to maintain structural timber components in position and to ensure complete stability during construction. 770 ADDITIONAL SUPPORTS - Provision: Position and fix additional studs, noggings and/ or battens to support edges of sheet materials, and wall/ floor/ ceiling mounted appliances, fixtures, etc. shown on drawings. - Material properties: Additional studs, noggings and battens to be of adequate size and have the same treatment, if any, as adjacent timber supports. 775 BEARINGS - Timber surfaces which are to transmit loads: Finished to ensure close contact over the whole of the designed bearing area. - Packings: Where provided, to cover the whole of the designed bearing area. - Crushing strength: Not less than timber being supported. - In external or inaccessible locations: Rot and corrosion proof. 780 WALL PLATES - Position and alignment: To give the correct span and level for trusses, joists, etc. - Bedding: Fully in fresh mortar. - Joints: At corners and elsewhere where joints are unavoidable use nailed half lap joints. Do not use short lengths of timber. 784 JOISTS GENERALLY - Joist Centres: Equal, and not exceeding designed spacing. - Bowed joists: Installed with positive camber. - End joists: Positioned approximately 50 mm from masonry walls. 786 JOISTS ON HANGERS - Hangers: Bedded directly on and hard against supporting construction. Do not use packs or bed on mortar. - Joists: Cut to leave not more than 6 mm gap between ends of joists and back of hanger. Rebate joists to lie flush with underside of hangers. - Fixing to hangers: A nail in every hole. 791 JOIST HANGERS FOR ROOF JOISTS WHERE IMPOSSIBLE TO NOTCH INTO BEAM - Manufacturer: Expamet - Product reference: Bat Joist Hanger Long leg Speedy and Short leg Speedy where appropriate. - Material/ finish: mild steel/galvanised to BS EN 10142 - Size: To suit joist, design load and crushing strength of supporting construction. 795 TRIMMING OPENINGS - Trimmers and trimming joists: When not specified otherwise, not less than 25 mm wider than general joists. 830 LATERAL RESTRAINT STRAPS, PERIMETER OF UPPER FLOORS GND TO THIRD - Manufacturer: BAT - Product reference: M305. - Material/Finish: GMS. - Size: Not less than 30 x 5 mm cross section, 150 mm cranked end and 1100 mm long. - Fixing: To top of joists / rafters/ ties at not more than 1.2 m centres, in between steels, and as shown on drawings. - Ensure that cranked end is in tight contact with cavity face of wall inner leaf and is not pointing upwards.

39 - Straps spanning joists/ rafters/ ties running parallel to wall: Fix noggings and packs tightly beneath straps. - Size of noggings and packs: Not less than three quarters of joist / rafter / tie depth and not less than 38 mm thick. - Notching: Notch joists so that straps fit flush with surface. Do not notch rafters/ties. 840 STRUTTING TO FLOOR JOISTS - Type: One of the following: - Herringbone strutting: At least 38 x 38 mm softwood. - Solid strutting: At least 38 mm thick softwood and at least three quarters of joist depth. - Proprietary metal strutting: Herringbone Joists Struts by Expamet - Fixing: Between joists as follows: - Joist spans of 2.5 to 4.5 m: One row at centre span. - Joist spans over 4.5 m: Two rows equally spaced. - Strutting must not project beyond top and bottom edges of joists. - Outer joists: Blocked solidly to perimeter walls.

40 P31 HOLES, CHASES, COVERS AND SUPPORTS FOR SERVICES To be read with Preliminaries/ General conditions and in conjunction with the Tender Stage Design Statement by BP. EXECUTION 620 HOLES AND CHASES IN IN SITU CONCRETE - Cast in: Holes larger than 10 mm diameter and chases. - Cutting and drilling: - Permitted for holes not larger than 10 mm diameter. - Not permitted for holes larger than 10 mm diameter except as indicated on drawings. 630 HOLES AND CHASES IN PRECAST CONCRETE - Cutting and drilling: Not permitted except as indicated on drawings. 640 HOLES IN STRUCTURAL STEELWORK - Cutting and drilling: Not permitted except as indicated on drawings. 650 HOLES, RECESSES AND CHASES IN MASONRY - Locations: To maintain integrity of strength, stability and sound resistance of construction. - Sizes: Minimum needed to accommodate services. - Holes (maximum): 300 x 300 mm. - Walls of hollow or cellular blocks: Do not chase. - Walls of other materials: - Vertical chases: No deeper than one third of single leaf thickness, excluding finishes. - Horizontal or raking chases: No longer than 1 m. No deeper than one sixth of the single leaf thickness, excluding finishes. - Chases and recesses: Do not set back to back. Offset by a clear distance at least equal to the wall thickness. - Cutting: Do not cut until mortar is fully set. Cut carefully and neatly. Avoid spalling, cracking and other damage to surrounding structure. 670 NOTCHES AND HOLES IN STRUCTURAL TIMBER - General: Avoid if possible. - Sizes: Minimum needed to accommodate services. - Position: Do not locate near knots or other defects. - Notches and holes in same joist: Minimum 100 mm apart horizontally. - Notches in joists: Locate at top. Form by sawing down to a drilled hole. - Depth (maximum): 0.125 x joist depth. - Distance from supports: Between 0.07 and 0.25 x span. - Holes in joists: Locate on neutral axis. - Diameter (maximum): 0.25 x joist depth. - Centres (minimum): 3 x diameter of largest hole. - Distance from supports: Between 0.25 and 0.4 of span. - Notches in roof rafters, struts and truss members: Not permitted. - Holes in struts and columns: Locate on neutral axis. - Diameter (maximum): 0.25 x minimum width of member. - Centres (minimum): 3 x diameter of largest hole. - Distance from ends: Between 0.25 and 0.4 of span. 690 INSTALLING PIPE SLEEVES - Sleeves: Fit to pipes passing through building fabric. - Material: Match pipeline.

41 - Size: One or two sizes larger than pipe to allow clearance. - Finish: Install sleeves flush with building finish. In areas where floors are washed down, install protruding 100 mm above floor finish. - Masking plates: Fit at visible penetrations, including through false ceilings of occupied rooms.

42 APPENDIX A BP PERFORMANCE SPECIFICATIONS FOR PLANNING

43 PERFORMANCE SPECIFICATION FOR DETAILING AND SCHEDULING OF REINFORCED CONCRETE ELEMENTS To be read with Preliminaries/ General conditions and in conjunction with the specifications and Design Statement by BP. Definitions: For the Structural Engineer read CA as necessary in the context. 1.0 GENERALLY The contractor is required to carry out the detailing of reinforcement bars and the production of bar bending schedules for the works. 2.0 DESIGN The Structural Engineer has carried out and is responsible for the design of all reinforced concrete elements, except for proprietary items, contractor-designed elements, or as otherwise provided for in the project specification. 3.0 INFORMATION PROVIDED BY THE ENGINEER The Structural Engineer, or the relevant specialist sub-contractor for contractor-designed elements, will provide the following information@ - The design reinforcement requirements in the form of summary calculations and / or marked-up drawings. - At the Structural Engineer s discretion, detailed sketches and/or drawings of specific areas where the reinforcement is deemed to be particularly critical. - Where the Structural Engineer has special curtailment requirements they will be stated and / or shown on marked up drawings. 4.0 DRAWINGS All drawings are to be A1size and generally to the following scales: - Slab & Walls 1:50 - Beams 1:20 - Details to suit & ensure clarity. Drawings are to be produced using CAD. Contractor detailed reinforcement drawings are required for the following areas (refer also to drawings): - In situ reinforced concrete capping beams, beams, columns, walls and all slabs. - Reinforced structural toppings to profiled metal decks. - Sundry in situ reinforced concrete items. 5.0 DETAILING Detailing shall be carried out in accordance with all relevant British Standards and the recommendations given in Standard method of detailing structural concrete, published by the Institution of Structural Engineers, unless instructed to the contrary by the Structural Engineer. The simplified curtailment rules given in BS8110 shall apply unless otherwise stated. Starter bars are to be shown on the drawings referring to elements that are cast first, e.g. retaining

44 wall starters are to be shown on the retaining wall base reinforcement drawing. The contractor shall be free to detail the reinforcement to suit his proposed method of construction; however he should note the requirements in other parts of the project specification for seeking approval of his proposals in this respect. 6.0 PROGRAMME Prepare a programme for drawing production Submit programme to CA for agreement. 7.0 CHECKING AND APPROVALS A detailed check by the contractor for each drawing/schedule will be required by a person other than the originator. The checked drawing/schedule ( greened/redded off) must be available for inspection by the Structural Engineer. Submit reinforcement drawings to the Structural Engineer for a design check. Allow not less than 2 weeks for acceptance.

45 PERFORMANCE SPECIFICATION FOR PILING AND ASSOCIATED WORKS INTRODUCTION To be read with Preliminaries / General conditions and in conjunction with the specifications and Tender Stage Design Statement by BP. 1.0 SERVICES REQUIRED The services required in relation to the substructure work covered by this specification and the piling section of the workmanship and materials specification includes: Interpretation of site investigation information, determination of all necessary parameters and analysis of ground induced loading and deformation. Selection of appropriate construction methods, plant and material to effect support to the vertical loadings specified and the derived lateral loads within the physical constraints of the site, the deformation limits specified and to allow safe construction of the required basement. Design of piles for the various purposes described and / or identified. Design of associated geotechnical processes. Obtaining approval of the engineer and Building Control department for the scheme and detailed design. Assisting the engineer in negotiation with any other affected body or person, including public drainage undertaker and appointed party wall surveyors of neighbouring properties including any necessary provision of additional information on noise, vibration, ground movements etc. Complying with Clause 13 of the construction (Design and Management) Regulations, preparing risk assessments and suitable documentation for inclusion in the contract specification and pre-contract Health and Safety Plan. Derivation of propping loads for permanent and temporary works cases taking into account reasonable range of prop stiffnesses and load transfer procedures. Assisting the engineer in developing performance specifications for the temporary and permanent lateral support to the piled retaining walls to ensure performance of the walls in accordance with this specification and the design. Provision of all materials, plant, labour and supervision for the installation of the piles as specified and designed. Installation of the piles as designed and specified to an agreed sequence and programme. Integrity and load testing of installed piles as specified or otherwise required to demonstrate the adequacy of the installation. Design and execution of any remedial works necessitated by failure to meet the requirements of the specification or full collaboration with others charged with such remedial works design and execution. Any other service reasonably required to complete the installation of the substructure and enable its effective incorporation into the permanent works construction. Tenderers must ensure that they understand the purpose, performance requirements and constraints relating to the works and that these have been fully allowed for in their proposals and pricing. Specifically, they shall be deemed to have visited the site and made any necessary enquires of the

46 engineer or any other party necessary to establish and clarify any matter relating to the performance of the services described. 2.0 DESCRIPTION OF CONTRACT WORKS The general layout and relationship of the required piled structures and other geotechnical processes is shown on General Arrangement drawing and details on drawings referred to by those drawings. These drawings indicate zones of installations based on preliminary assessment of options and discussions with specialist sub-contractors. The contractor may propose alternative techniques which address the specified purpose and performance of the installations and the constraints of the site and its environs. Similarly any particular technique may be applied to more than one of the separately identified types of structure. For convenience the following sections outline some of the reasons for proposing the illustrated form of construction. This information in no way reduces the contractor s responsibility for selecting methods and plant which take into account all factors and requirements. 3.0 PERFORMANCE REQUIREMENTS FOR STRUCTURES 3.1 REINFORCED UNDERPINNING AROUND SITE BOARDER AND RETAINED BUILDING These structures are to be constructed from within the perimeter of the building after the alterations for access have been made. Constraints identified are those of access, manoeuvrability and proximity to and effects on adjoining premises. The indicated solution is reinforced concrete underpinning around the perimeter of the basement. The structure is required to provide effective lateral support to the ground such as to control vertical and horizontal deformation with the aid of temporary propping during excavation and permanent support from the structural floors of the completed building at the basement level and the lower ground floor level. The wall will also carry vertical load from the permanent structure. It is also required to restrict inflow of water and prevent loss of solid material into the excavation. Deformation criteria are related to the need to protect the adjoining properties and the existing retained building from unacceptable deformation and damage and the ability of the superstructure to accommodate differential vertical movements. General acceptable damage classification 1 of BRE Digest 251. Top down construction or temporary propping is to be designed by the contractor and is to be indicated on their drawings. This temporary works design shall take into account constraints on level, plan layout and reaction arising from considerations of excavation process, permanent structure and the nature and condition of existing buildings etc.

47 Applied Loads Dead Imposed Vertical load from ground floor (kn/m) Assumed surcharge from adjoining buildings at the underside of the existing foundations (kn/m) Total unfactored loads vary and are shown on BP s drawings Varies refer to Bp s drawings Surcharge on highway (kn/m²) - 10 Limits for Assessed Deformation: Maximum Horizontal deflection of top of wall 5 mm Maximum settlement of party wall 10 mm Maximum settlement of piled wall at vertical design working load 10 mm Calculated factor of safety against failure in compression or tension for bearing piles to be 3.0 unless otherwise agreed in writing by the engineer and building control department. 3.2 SETTLEMENT REDUCTION PILES These piles are to be constructed so that heave and settlement at the formation level due to unloading and reloading the ground can be reduced to an acceptable level. They are to be constructed from within the site after demolition. The only constraints identified are those of access, manoeuvrability and effects on adjoining premises. No preferred or suggested solution is indicated. This work must be carried out after alteration of existing structures. Applied Loads: Dead Imposed As given on Design Calculations (kn) 1500kN total ultimate load as noted on BP drawings.

48 Limits for Assessed Deformation: Maximum settlement under design vertical compression (ultimate) 20 mm Maximum uplift under design vertical tension N/A mm Calculated factor of safety against failure in compression or tension to be 1.0 unless otherwise agreed in writing by engineer and building control department. Report Prepared by: Report Approved by: Name: Paul Radford Name: Alan Bowling CEng MIStructE For Date: 1 st of April 2014