STRUCTURAL GUIDE THE PERFECT PARTNER FOR THE TRADE

Transcription

1 THE PERFECT PARTNER FOR THE TRADE

2 INTRODUCTION The following guide has been devised so as to allow the correct selection of components for a range of standard conservatory styles. The information has been developed from an extensive programme of structural analysis and has been simplified as far as possible. It should be noted however, that a certain amount of information will be required to allow accurate selection of the components. The information required to use the guide is as follows: Conservatory size and style Glazing type Location Exposure (town or country) Approx. altitude of site Approx. distance from sea Generally, the dominant load on a roof is the snow load and therefore reference to loads are only made to sections -. Some areas of the United Kingdom however with high altitude/ exposed/coastal locations may have wind loads that are higher than the snow loads associated with that area. For installations in these type of areas where the wind loading is dominant, reference should be made to section or contact made with the K Technical Department. Structural stability is dependent not only on individual components but also on the interaction of the structure as a whole. Careful consideration must be given to the supporting structure beneath the roof such as the vertical side frames of PVC or timber and associated brickwork below which should be designed in accordance with the relevant British Standards for both vertical and lateral loadings. If you are in any doubt about the loading of the vertical side frames it is advised you contact the technical department of your side frame supplier for guidance. With reference to this structural guide it is assumed that the conservatory is being attached to an existing building and is not freestanding. 0

3 HOW TO USE THIS GUIDE Listed below is a step-by-step procedure for the use of this guide. If you are in any doubt on any aspect of the guide then please contact the K Technical Department for advice. STEP STEP STEP STEP Style and size of conservatory Check these guidelines for the style of conservatory required and all relevant sizes. Make sure that the roof is not over the maximum sizes given in section of this Structural Guide. Determine the snow load Determine the snow load from the British Isles map in section. Location of site If the conservatory is to be installed in an exposed country location, exposed coastal location or at high altitude, then please refer to section to ascertain whether the wind load is the dominant factor. If so or you are in any doubt, contact K Technical Department for advice. Select transom glazing bar Select the correct transom glazing bar for the required glazing type, bar spacing and loading conditions from section. There are two sections shown here depending on the style of roofing: a. Victorian/Georgian Style b. Lean to Style c. mm Low Pitch System STEP Select hip glazing bar Select the correct hip bar for the required glazing type, bar spacing and loading conditions from section. There are two sections shown here depending on the style of roof: a. Victorian Hip Bar b. Georgian Hip Bar STEP Tie Bar Guide Determine the tie bar requirement for the proposed roof using section. 0

4 STYLE AND SIZE OF CONSERVATORY SECTION 0 All sizes given are based on internal frame dimensions. LEAN TO MAXIMUM MAXIMUM Glass Polycarbonate no limit no limit see section b see section b VICTORIAN MAXIMUM MAXIMUM Glass Polycarbonate 70mm 00mm 00mm 00mm GEORGIAN MAXIMUM MAXIMUM Glass Polycarbonate 0mm 000mm 00mm 00mm GABLE Glass Polycarbonate MAXIMUM 70mm 00mm MAXIMUM 00mm 00mm If the roof size is outside these sizes please contact the K Technical Department for advice. Telephone 00. 0

5 SECTION 0 SNOW LOADING Design snow load of 0.8kN/m (80kg/m ) or more 0 Design snow load of 0.kN/m (0kg/m ) or more Wind Speed m/s Inverness Aberdeen Oban Perth Dundee Glasgow Edinburgh Londonderry Newcastle Belfast Carlisle Preston Liverpool Manchester York Leeds Kingston upon-hull Sheffield Nottingham Stoke Leicester Birmingham Norwich Aberystwyth Swansea 0 Northampton Oxford Bedford Ipswich Cardiff Bristol LONDON Bournemouth Brighton Plymouth 0

6 SNOW LOADING SECTION 0 Snow Altitude Factor For conservatory installations less than 00m above sea level the 0.kN/m and 0.8kN/m snow regions indicated on the map (page ) can be utilised. For installations at altitudes greater than 00m and less than m above sea level within the 0.kN/m of the map the 0.8kN/m table can be used. Acknowledgment Extracts from BS 99 Part :997 are reproduced with the permission of BSI under license number 000SK/009. Complete standards can be obtained from BSI Customer Services, 89 Chiswick High Road, London W AL. For installations at altitudes greater than m within the 0.kN/m and greater than 00m in the 0.8kN/m region, guidance should be sought from the K Technical Department. If in doubt about the altitude of a particular installation refer to local Ordnance Survey map. References Reference has been made to the following publications in the production of this document: BS 99 Part BS 99 Part BS 88 BS BS Loading for Buildings - Wind Loads Loading for buildings - Snow Loads Structural Use of Aluminium Design and Installation of Sloping and Vertical Patent Glazing Glazing for Buildings 0

7 SECTION 0 WIND LOADING Dominant Wind Load Basic Speeds 0.kN/m Snow Load on a Polycarbonate Roof in the Country 0 7 : 9 m/s : 0 m/s : m/s : m/s : m/s : m/s : m/s Altitude above sea level (metres) Closest distance from the sea (km) Dominant Wind Speed Table Multiplication Factors 0.8kN/m snow load roofs. Location in city/town (town extending >m upwind from site). -- mm double glazed units.0 -- mm double glazed units.0 Please contact the K Technical Department if the site is subject to the following categories: Where dominant forces wind speeds are greater than those from the illustrated map (page ) for the area in question. Locations near the summit of a hill, crest of a cliff, escarpments or ridges. For conservatories of overall height greater than.m. 07

8 VICTORIAN/GEORGIAN TRANSOM SPAN CHART SECTION 0a POLYCARBONATE Example Calculation Half width multiplied by slope factor table below equals effective span. OVERALL Example: 000mm overall width gives 00mm half width. 00mm multiplied by.0 (0 degrees) equals 70mm effective span. Slope Calculation Factor Slope Angle (degrees) 0 0 Span Multiplication Factor Victorian Style OVERALL 0.kN/m Snow Load Georgian Style Glazing Bar Centres (mm) : mm Heavy Duty Bar/mm Aspire : mm Heavy Duty Bar : mm Standard Bar : mm Standard Bar 0.8kN/m Snow Load Please note that overall sizes of the required roof design must not exceed those stated in section Glazing Bar Centres (mm) : mm Heavy Duty Bar/mm Aspire : mm Heavy Duty Bar : mm Standard Bar : mm Standard Bar 08

9 SECTION 0a VICTORIAN/GEORGIAN TRANSOM SPAN CHART OVERALL DOUBLE GLAZED UNITS (::mm) Example Calculation Half width multiplied by slope factor table below equals effective span. Example: 000mm overall width gives 00mm half width. 00mm multiplied by.0 (0 degrees) equals 70mm effective span. Victorian Style Slope Calculation Factor Slope Angle (degrees) 0 0 Span Multiplication Factor OVERALL 0.kN/m Snow Load 00 Georgian Style : mm Heavy Duty Bar : mm Standard Bar Glazing Bar Centres (mm) Please note that overall sizes of the roof design must not exceed those stated in section. 0.8kN/m Snow Load : mm Heavy Duty Bar : mm Standard Bar Glazing Bar Centres (mm) 09

10 VICTORIAN/GEORGIAN TRANSOM SPAN CHART SECTION 0a DOUBLE GLAZED UNITS (::.mm) Example Calculation Half width multiplied by slope factor table below equals effective span. OVERALL Example: 000mm overall width gives 00mm half width. 00mm multiplied by.0 (0 degrees) equals 70mm effective span. Slope Calculation Factor Slope Angle (degrees) 0 0 Span Multiplication Factor Victorian Style OVERALL 0.kN/m Snow Load Georgian Style Glazing Bar Centres (mm) : mm Heavy Duty Bar : mm Standard Bar 0.8kN/m Snow Load Please note that overall sizes of the required roof design must not exceed those stated in section Glazing Bar Centres (mm) : mm Heavy Duty Bar : mm Standard Bar 0

11 SECTION 0b LEAN-TO TRANSOM SPAN CHART POLYCARBONATE PITCH Example Calculation Projection on plan multiplied by slope factor table below equals effective span. Example: 000mm projection multiplied by.0 ( degrees) equals 07mm effective span. Lean-to Style ON PLAN Slope Calculation Factor Slope Angle (degrees) Span Multiplication Factor kN/m Snow Load 000 : mm Heavy Duty Bar With Bolster/ mm Aspire With Bolster : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar/mm Aspire : mm Heavy Duty Bar : mm Standard Bar : mm Standard Bar Glazing Bar Centres (mm) kN/m Snow Load 000 : mm Heavy Duty Bar With Bolster/ mm Aspire With Bolster : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar/mm Aspire : mm Heavy Duty Bar : mm Standard Bar : mm Standard Bar Glazing Bar Centres (mm)

12 LEAN-T0 TRANSOM SPAN CHART SECTION 0b DOUBLE GLAZED UNITS (::mm) Example Calculation Projection on plan multiplied by slope factor table below equals effective span. PITCH Example: 000mm projection multiplied by.0 ( degrees) equals 07mm effective span. Slope Calculation Factor Slope Angle (degrees) Span Multiplication Factor Lean-to Style ON PLAN kN/m Snow Load Glazing Bar Centres (mm) : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar : mm Standard Bar kN/m Snow Load Glazing Bar Centres (mm) : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar : mm Standard Bar

13 SECTION 0b LEAN-TO TRANSOM SPAN CHART DOUBLE GLAZED UNITS (::.mm) Example Calculation PITCH Projection on plan multiplied by slope factor table below equals effective span. Example: 000mm projection multiplied by.0 ( degrees) equals 07mm effective span. Lean-to Style ON PLAN Slope Calculation Factor Slope Angle (degrees) Span Multiplication Factor kN/m Snow Load : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar : mm Standard Bar Glazing Bar Centres (mm) kN/m Snow Load : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar : mm Standard Bar Glazing Bar Centres (mm)

14 TRANSOM SPAN CHART SECTION 0c mm LOW PITCH SYSTEM POLYCARBONATE 00 0.kN/m Snow Load PITCH Lean-to Style ON PLAN Projection on Plan (mm) Bar Spacing (mm) : mm Heavy Duty Bar kN/m Snow Load Projection on Plan (mm) Bar Spacing (mm) : mm Heavy Duty Bar

15 SECTION 0a VICTORIAN HIP SPAN CHART BAY Victorian Style OVERALL POLYCARBONATE Victorian Style Half width multiplied by slope factor table below equals effective span. Lean to with Victorian Hips Projection on plan multiplied by slope factor table below equals effective span. Transom glazing bars can either be jack rafters or splayed when used with Victorian style roofs. Slope Calculation Factor Slope Angle (degrees) Span Multiplication Factor ON PLAN BAY Lean-to with Victorian Hips : mm Heavy Duty Bar With Bolster/ mm Aspire With Bolster : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar/mm Aspire : mm Heavy Duty Bar : mm Standard Bar : mm Standard Bar kN/m Snow Load Half Bay (mm) Please note that overall sizes of the roof design must not exceed those stated in section kN/m Snow Load : mm Heavy Duty Bar With Bolster/ mm Aspire With Bolster : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar/mm Aspire : mm Heavy Duty Bar : mm Standard Bar : mm Standard Bar Half Bay (mm)

16 VICTORIAN HIP SPAN CHART SECTION 0a DOUBLE GLAZED UNITS (::mm) Victorian Style Half width multiplied by slope factor table below equals effective span. Lean to with Victorian Hips Projection on plan multiplied by slope factor table below equals effective span. Transom glazing bars can either be jack rafters or splayed when used with Victorian style roofs. Slope Calculation Factor BAY Victorian Style OVERALL Slope Angle (degrees) Span Multiplication Factor kN/m Snow Load ON PLAN BAY Lean-to with Victorian Hips Half Bay (mm) : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar : mm Standard Bar kN/m Snow Load Please note that overall sizes of the roof design must not exceed those stated in section Half Bay (mm) : mm Heavy Duty Bar with Bolster : mm Heavy Duty Bar : mm Standard Bar

17 SECTION 0a VICTORIAN HIP SPAN CHART BAY Victorian Style OVERALL DOUBLE GLAZED UNITS (::.mm) Victorian Style Half width multiplied by slope factor table below equals effective span. Lean to with Victorian Hips Projection on plan multiplied by slope factor table below equals effective span. Transom glazing bars can either be jack rafters or splayed when used with Victorian style roofs. Slope Calculation Factor Slope Angle (degrees) Span Multiplication Factor ON PLAN kN/m Snow Load BAY Lean-to with Victorian Hips : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar : mm Standard Bar Half Bay (mm) Please note that overall sizes of the roof design must not exceed those stated in section kN/m Snow Load : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar : mm Standard Bar Half Bay (mm) 7

18 GEORGIAN HIP SPAN CHART SECTION 0b POLYCARBONATE OVERALL Projection and half width on plan should be taken to calculate the correct Georgian hip bar to be used on the roof. The transom glazing bars can be either jack rafters or splayed. Please note that overall sizes of the roof design must not exceed those stated in section kN/m Snow Load Georgian Style Projection (mm) Lean-to with Georgian Hips : mm Heavy Duty Bar With Bolster/ mm Aspire With Bolster : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar/mm Aspire Half Width (mm) : mm Heavy Duty Bar : mm Standard Bar 0.8kN/m Snow Load : mm Standard Bar Projection (mm) : mm Heavy Duty Bar With Bolster/ mm Aspire With Bolster : mm Heavy Duty Bar With Bolster 00 : mm Heavy Duty Bar/mm Aspire 00 : mm Heavy Duty Bar : mm Standard Bar Half Width (mm) : mm Standard Bar 8

19 SECTION 0b GEORGIAN HIP SPAN CHART OVERALL DOUBLE GLAZED UNITS (::mm) Projection and half width on plan should be taken to calculate the correct Georgian hip bar to be used on the roof. The transom glazing bars can be either jack rafters or splayed. Please note that overall sizes of the roof design must not exceed those stated in section. Georgian Style kN/m Snow Load Lean-to with Georgian Hips Projection (mm) : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar : mm Standard Bar Half Width (mm) kN/m Snow Load Projection (mm) : mm Heavy Duty Bar with Bolster : mm Heavy Duty Bar : mm Standard Bar Half Width (mm)

20 GEORGIAN HIP SPAN CHART SECTION 0b DOUBLE GLAZED UNITS (::.mm) OVERALL Projection and half width on plan should be taken to calculate the correct Georgian hip bar to be used on the roof. The transom glazing bars can be either jack rafters or splayed. Please note that overall sizes of the roof design must not exceed those stated in section kN/m Snow Load Georgian Style Projection (mm) Lean-to with Georgian Hips Half Width (mm) : mm Heavy Duty Bar With Bolster : mm Heavy Duty Bar : mm Standard Bar 0.8kN/m Snow Load Projection (mm) Half Width (mm) : mm Heavy Duty Bar with Bolster : mm Heavy Duty Bar : mm Standard Bar 0

21 SECTION 0 TIE GUIDE Tie Bar Rules When a tie bar is required it must be installed in line with the pair of glazing bars closest to the end of the ridge. (Max distance from end of ridge 70mm.) When multiple tie bars are required, the first one is to be positioned as described above with the remaining bars positioned at equal intervals between the first tie bar and the wall. For advice on sizes outside the following charts contact the K Technical Department. Special rules apply to free-standing and double ended conservatories. Contact the K Technical Department for advice. How the Tie Bar Works Tie bars are a mechanism used to laterally restrain movement in opposing eaves beams. By securing a tie bar between two eaves beams, the spread effect created by loads placed on the roof (wind, snow, glass etc.) is prevented. LOAD TRANSFERRED LOAD On the following tables it is assumed that the conservatories are attached to the house wall at the rear and that the roof pitches are equal on all sides. The following tables are relevant to areas with a maximum snow load of 0.8 kn/m. TIE ACTION HORIZONTAL SPREAD OF EAVES BEAM Victorian These tie bar tables can be used for either or bay victorian roofs. The tables have been based on the roof having the same pitch on all sides. (mm) Glass (mm) (mm) Polycarbonate (mm)

22 TIE RULES SECTION 0 Georgian These tie bar tables are for georgian roofs only. The tables have been based on roof having the same pitch on all sides. (mm) Glass (mm) (mm) Polycarbonate (mm) Gable The following have been based on the roofs having equal pitch on both sides and with one gable end attached to the building. When gable roofs are built with a continuous eaves beam, tie bars must be equally spaced along the ridge. In cases were the eaves beam is non-continuous, the first tie bar must be positioned under the first set of glazing bars behind the gable frame. In all cases the maximum distance between sets of bars must not exceed 00mm.

23 SECTION 0 TIE RULES LENGTH SPAN LENGTH Double Ended Ridges/Hipped Back Roofs When one set of tie bars is required, it should be positioned centrally along the ridge. SPAN If two or more sets are required, two should be positioned as close to the finial points as possible. SPAN LENGTH For roofs outside of these parameters please contact the K Technical Department for advice. LENGTH Glass LENGTH (mm) SPAN Polycarbonate LENGTH (mm) SPAN (mm) SPAN (mm) P-Shaped Conservatories. Victorian and Georgian roofs greater than 000mm in width require a tie bar. LEAN TO. If possible the tie bar should be positioned in line with the front edge of the lean to section. If this is not possible the tie bar can be positioned up to a maximum of / way up the valley.. If possible the finial point of the main ridge should be inline with the front edge of the lean to section or beyond it. OVERALL. Under no circumstances should bolster bars be fitted on roof designs incorporating valleys.. Tie bars must be positioned beneath glazing bars.

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