BS CP 143-10-1973 Code of practice for sheet roof and wall coverings - Code of practice for sheet roof and wall coverings - Galvanized corrugated steel - Metric units《薄板屋顶和墙面饰层的实施规.pdf

1、CODE OF PRACTICE CP 143-10: 1973 Sheet roof and wall coverings Part 10: Galvanized corrugated steel Metric units UDC 69.024.156:691.71 417.2:669.146.99:669.586 + 69.022.325:691.71 417.2:699.146.99:669.586CP143-10:1973 This Part of this Code of Practice has been prepared by a committeeconvened by the

2、 Codesof Practice Committee forBuilding. Having been endorsed by the council for Codesof Practice, it was publishedunder the authorityofthe Executive Boardon 19 February 1973 BSI 04-2000 First published as Part 2 October1961 First revision in metric form as Part 10 1973 The following BSI references

3、relate to the work on this Code: Committee reference BLCP/13/2 Draft for approval 71/12557 ISBN 0 580 07621 0 Sub-committee BLCP/13/2 Galvanizedcorrugated steel roofing Mr. C.W. Hutton Chairman Mr. L.V. Leech British Constructional Steelwork Association Mr. H.V. Hill British Steel Corporation Mr. A.

4、G. Hunt Mr. E.F. Wall Institution of Structural Engineers Mr. B.A. Exton National Federation of Roofing Contractors and Federation of Associations of Specialists and Sub-Contractors Mr. C.W. Hutton Royal Institute of British Architects Mr. N.K. Green British Standards Institution Amendments issued s

5、ince publication Amd. No. Date of issue CommentsCP143-10:1973 BSI 04-2000 i Contents Page Foreword iii 1 General 1 1.1 Scope 1 1.2 Definitions 1 1.3 Exchange of information and time schedule 1 2 Materials, appliances and components 1 2.1 Galvanized corrugated steel sheets 1 2.2 Profiles and dimensio

6、ns of galvanized corrugated steel sheets 1 2.3 Accessories and fittings 1 2.4 Fixing accessories 1 2.5 Sealing material 1 2.6 Flashings 1 2.7 Galvanized rainwater goods 2 2.8 Walkways 2 3 Design considerations 2 3.1 General 2 3.2 Durability 2 3.3 Weathertightness 2 3.4 Thermal insulation 3 3.5 Fire

7、hazard 3 3.6 Condensation 3 3.7 Weight of sheeting 3 3.8 Purlin spacing and strength of sheeting 3 3.9 Methods of fixing the sheeting 4 3.10 Pipes, etc., passing through roofing 5 3.11 Roof ventilators and roof lights 5 3.12 Gutters and rainwater pipes 5 3.13 Walkways and roof-boards 7 4 Application

8、 7 4.1 Safety precautions 7 4.2 Ladders, scaffolding and hoists 7 4.3 Storage and handling of sheets at suppliers, stores or on site 7 4.4 Preparation of sheet for roofing and vertical cladding 7 4.5 Layout of the sheeting 7 4.6 Fixing the sheets 8 4.7 Fixing of accessories 8 5 Inspection 8 5.1 Insp

9、ection on site 8 6 Maintenance 9 6.1 General 9 6.2 Need for painting 9 6.3 Paints suitable for galvanized sheets 9 6.4 Further information 9 Appendix A Thermal transmittance (U value) 10 Figure 1 Typical sheets and side laps 11 Figure 2 Details of corrugated steel sheeting 12 Figure 3 Typical layout

10、s and end laps of 10/76.2mm corrugated steel sheeting 13CP143-10:1973 ii BSI 04-2000 Page Table 1 Dimensions and net width covered per sheet of galvanized corrugated steel 2 Table 2 Types of material and weights of zinc coating 2 Table 3 Approximate weight of sheeting for 76-2mm and 127mm corrugatio

11、ns per square metre asfixed (including side and end laps) 3 Table 4 Properties of corrugated sheets 4 Table 5 Maximum permissible purlin spacings for limiting stress and deflection for pitched roofs 5 Table 6 Flow capacities for level gutters with outlet at one end 6 Table 7 Recommended downpipe siz

12、es (diameters) for level and sloping gutters 6 Publications referred to Inside back coverCP143-10:1973 BSI 04-2000 iii Foreword This metric edition of Part 2 of CP143, which has been designated Part10, is the metric version of that published in imperial units in1961. Part 10 has been prepared as par

13、t of the change to the metric system and gives values in SI units; it is not a complete technical revision. PD 6030, “Programme for the change to the metric system in the construction industry”, outlines a programme for sizing building components and assemblies in order to achieve the co-ordination

14、of dimensions where appropriate. According to the recommendations of Technical CommitteeB/94 set out in PD6432, “Dimensional co-ordination in building. Arrangement of building components and assemblies within functional groups,” corrugated sheet materials are classified as grade B components. In rec

15、ognition of the wide variety of materials and profiles used as roof and wall cladding a special investigation panelB/-/12 was set up charged with the task of formulating recommendations for the long- and short-terms, recognizing that long-term changes would involve new profiles and of necessity be s

16、pread over a period of several years. Long-term recommendations laid stress on the importance of “cover width” as the co-ordinating dimension and, to assist as far as possible until sheets are manufactured to such dimensionally co-ordinated widths, metric equivalents given include the cover widths f

17、or the existing profiles, as a first stage towards the use of the “cover width” for dimensional co-ordination. This Code of Practice represents a standard of good practice and therefore takes the form of recommendations. Compliance with it does not confer immunity from relevant statutory and legal r

18、equirements. Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, pages1to14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on t

19、he inside front cover.iv blankCP143-10:1973 BSI 04-2000 1 1 General 1.1 Scope This Code deals with the use of galvanized corrugated steel sheets for roofing and cladding in building. It does not refer to standardized forms of building which are already covered by other BritishStandards, e.g. in BS17

20、54. Recommendations are given on materials and design, construction and maintenance, together with information on weathertightness, durability, thermal insulation, fire hazard, rainwater drainage from roofs and other characteristics. NOTEThe titles of the British Standards referred to in this standa

21、rd are listed on the inside back cover. 1.2 Definitions The terms used throughout this Code have the meaning assigned to them in BS2717. 1.3 Exchange of information and time schedule The working drawings and specification should be prepared in sufficient detail to afford proper guidance in the prepa

22、ration of estimates and the execution of the work. Where bills of quantities form part of the contract, they should be prepared in accordance with the Standard Method of Measurement for Building Works or the Scottish Mode for the Measurement of Building Works, as appropriate. There should be a full

23、exchange of information between all concerned with the roofing and the work adjacent to it in sufficient time to ensure that the covering can be carried out at the proper time and that all necessary provisions for fixing have been made in advance. Early arrangements should be made on the site for ra

24、inwater disposal. Roof covering should be completed before internal finishes are begun. 2 Materials, appliances and components 2.1 Galvanized corrugated steel sheets Galvanized corrugated steel sheets used in constructing roofs and sides of buildings in accordance with the recommendations of this Co

25、de are to comply with the requirements of BS3083. Where a profile other than a corrugated sheet is required, the quality requirements are to comply with BS3083. 2.2 Profiles and dimensions of galvanized corrugated steel sheets The most commonly used profile is the 76.2mm corrugation with either eigh

26、t or ten corrugations per sheet; the profiles are shown diagrammatically in Figure 1. The dimensions and the net width covered per sheet of galvanized corrugated steel are given in Table 1. Any profile, however, may be used that provides adequate strength for the particular loading conditions and fo

27、r the purlin spacing adopted. 2.3 Accessories and fittings A wide range of galvanized steel sheet roofing accessories are made by the sheet producers and can be obtained from them or through builders merchants. Special fittings to meet specific purposes may be obtained from constructional and sheet

28、metal engineers. Where continuously galvanized steel sheet is used to construct these accessories it should comply with the requirements of BS2989. 2.4 Fixing accessories Hook bolts, drive screws, bolts, nuts, rivets and washers should comply with the requirements of BS1494. Any other fixings requir

29、ed should be of similar quality, and care should be taken in their design to ensure that they do not impair the efficiency of the roof or side covering. 2.5 Sealing material Where flexible seals are required, a bituminous mastic or other material of similar characteristics is recommended. 2.6 Flashi

30、ngs Where zinc and lead sheets are used for flashings they should comply with the following requirements: 1) Zinc. BS849 and not lighter than 0.813mm (14 zinc gauge). 2) Lead. BS1178 and not less than the following thicknesses a) gutters: BS Gauge No. 6. b) flashings: BS Gauge No.4.CP143-10:1973 2 B

31、SI 04-2000 Table 1 Dimensions and net width covered per sheet of galvanized corrugated steel 2.7 Galvanized rainwater goods Galvanized rainwater goods should comply with the requirements of BS1091. Where manufactured from continuously galvanized sheet, material should comply with the requirements of

32、 BS2989. 2.8 Walkways Permanent walkways, where required, should be of durable material and designed to take a maintenance load equivalent to 890N concentrated centrally to produce the worst conditions of loading. 3 Design considerations 3.1 General To secure maximum economy the roof plan should be

33、simple, and hips and valleys should be avoided. Sheets of standard size should be used wherever possible. 3.2 Durability Galvanized corrugated steel sheets provide a strong, rigid, non-porous and durable roofing and siding material. To obtain an indefinite life, particularly in polluted or damp atmo

34、spheres, they should be painted at regular intervals of time. (See Section6.) Four weights of zinc coating are specified in BS3083; see Table 2. Selection of a suitable weight of zinc coating should take account of the service conditions of the cladding and local atmospheric conditions which should

35、be stated when ordering the sheets, and the manufacturers advice obtained. Table 2 Types of material and weights ofzinc coating 3.3 Weathertightness Galvanized corrugated steel sheet roofs provide good weathertightness. The principal factors affecting weathertightness of roofs covered with themateri

36、al are as follows. 1) End lap. End laps should be a minimum of150mm for slopes of 20 and over with a minimum of 100mm for vertical falls. Flatter slopes, especially on wide buildings and where exposed to driving rain, may require end lap greater than 150mm and sealing with mastic. 2) Side lap. Side

37、laps should be formed on the side of the sheet away from the prevailing winds. Where conditions are severe, a side lap of two corrugations is recommended for the 76.2mm corrugation. Where weather conditions are moderate, a lap of one-and-a-half corrugations may be used by turning alternate sheets up

38、side down. In sheltered conditions, a side lap of one corrugation tightly closed is suitable. The net width covered per sheet is given in Table 1. Designation Overall width of sheet after corrugation Pitch of corrugation Depth of corrugation, crown to valley Cover width including laps. 1 Corrugation

39、 1“ Corrugations 2 Corrugations Min. Work size Max. Min. Work size Max. Min. Work size Max. mm mm mm mm mm mm mm mm mm mm mm mm 8/3 in 660.4 76.2 19 605 610 615 567 572 577 528 533 538 10/3 in 812.8 76.2 19 757 762 767 719 724 729 681 686 691 12/3 in 966.2 76.2 19 908 914 920 870 876 882 832 838 844

40、 5/5 in 711.2 127 32 630 635 640 6/5 in 838.2 127 32 757 762 767 NOTELength. Galvanized corrugated steel sheets are normally stocked in lengths from 1200mm rising in intervals of 150mm to3650mm. Longer lengths up to 7600mm may be specially obtained. Type Weight of zinc coating a Min. Max. g/m 2 g/m

41、2 125 150 180 200 381 458 550 610 455 548 608 762 a The weight of coating is the total amount of zinc on both sides of the sheet before corrugating, expressed as a weight per square metre of the flat sheet and not per square metre of corrugated surface.CP143-10:1973 BSI 04-2000 3 3) Accessories. Whe

42、never possible, accessories should be chosen from stock patterns; special fittings, if required, should be designed to fit closely. Accessories should be carefully fitted to make a weathertight joint. 4) Rainwater discharging on the roof. No gutter or rainwater pipe should be allowed to discharge on

43、 to the roofing. 3.4 Thermal insulation Galvanized corrugated steel sheeted roots can be insulated thermally to suit all requirements. The thermal transmittance can be adjusted to any required value by the use of insulating material laid either between the purlins and the sheeting or under the purli

44、ns, thus incorporating an air gap. For information regarding heat losses through roofs see Appendix A. 3.5 Fire hazard Galvanized corrugated steel roofing sheets are non-combustible and would make no contribution to a fire. Structures incorporating galvanized corrugated steel sheet may be designed t

45、o give any desired fire resistance when combined with suitable materials. 3.6 Condensation Condensation may occur under certain weather conditions but may be avoided by ensuring adequate ventilation of the under side of the roof. This may be effected by laying the sheets with a gap between them made

46、 weathertight by increasing the overlaps or by employing specially louvred sheets. When the roof is lined with thermal insulation board, the possibility of interstitial condensation should not be overlooked and it is generally advisable to provide a water vapour barrier at the surface facing the int

47、erior of the building. This can be an impervious membrane or a sprayed “cocoon”. The additional precaution of providing ventilation through the sheets will also reduce condensation and will not greatly reduce the thermal insulation of the lining. The application of special surface treatments, such a

48、s anticondensation paint, may, under certain conditions, also be effective in reducing condensation. 3.7 Weight of sheeting The approximate weight of galvanized sheeting asfixed, including side and end laps, is given in Table 3. Table 3 Approximate weight of sheeting for76.2mm and 127mm corrugations

49、 per square metre as fixed (including side and end laps) 3.8 Purlin spacing and strength of sheeting The purlin spacing for roofs covered with galvanized corrugated steel sheets should preferably be arranged with a view to using standard sheets of uniform length throughout. Ridge purlins should be as near to the ridge as possible, having regard to the type of ridge capping to be used and the manner in which it is to be fixed. If ventilators are to be situated along the ridge, care should be taken that the ridge pur