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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 + 69.022.325:691.71 417.2:699.146.99:669.586 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:07:39
2、GMT+00:00 2006, Uncontrolled Copy, (c) BSI CP 143-10:1973 This Part of this Code of Practice has been prepared by a committee convened by the Codes of Practice Committee for Building. Having been endorsed by the council for Codes of Practice, it was published under the authority of the Executive Boa
3、rd on 19 February 1973 BSI 04-2000 First published as Part 2 October 1961 First revision in metric form as Part 10 1973 The following BSI references 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 Galvanized corrug
4、ated steel roofing Mr. C.W. HuttonChairman Mr. L.V. LeechBritish Constructional Steelwork Association Mr. H.V. Hill British Steel Corporation Mr. A.G. Hunt Mr. E.F. WallInstitution of Structural Engineers Mr. B.A. ExtonNational Federation of Roofing Contractors and Federation of Associations of Spec
5、ialists and Sub-Contractors Mr. C.W. HuttonRoyal Institute of British Architects Mr. N.K. GreenBritish Standards Institution Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:07:39 GMT+00:00 2006
6、, Uncontrolled Copy, (c) BSI CP 143-10:1973 BSI 04-2000i Contents Page Forewordiii 1General1 1.1Scope1 1.2Definitions1 1.3Exchange of information and time schedule1 2Materials, appliances and components1 2.1Galvanized corrugated steel sheets1 2.2Profiles and dimensions of galvanized corrugated steel
7、 sheets1 2.3Accessories and fittings1 2.4Fixing accessories1 2.5Sealing material1 2.6Flashings1 2.7Galvanized rainwater goods2 2.8Walkways2 3Design considerations2 3.1General2 3.2Durability2 3.3Weathertightness2 3.4Thermal insulation3 3.5Fire hazard3 3.6Condensation3 3.7Weight of sheeting3 3.8Purlin
8、 spacing and strength of sheeting3 3.9Methods of fixing the sheeting4 3.10 Pipes, etc., passing through roofing5 3.11 Roof ventilators and roof lights5 3.12 Gutters and rainwater pipes5 3.13 Walkways and roof-boards7 4Application7 4.1Safety precautions7 4.2Ladders, scaffolding and hoists7 4.3Storage
9、 and handling of sheets at suppliers, stores or on site7 4.4Preparation of sheet for roofing and vertical cladding7 4.5Layout of the sheeting7 4.6Fixing the sheets8 4.7Fixing of accessories8 5Inspection8 5.1Inspection on site8 6Maintenance9 6.1General9 6.2Need for painting9 6.3Paints suitable for ga
10、lvanized sheets9 6.4Further information9 Appendix A Thermal transmittance (U value)10 Figure 1 Typical sheets and side laps11 Figure 2 Details of corrugated steel sheeting12 Figure 3 Typical layouts and end laps of 10/76.2 mm corrugated steel sheeting13 Licensed Copy: London South Bank University, L
11、ondon South Bank University, Tue Dec 12 06:07:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CP 143-10:1973 ii BSI 04-2000 Page Table 1 Dimensions and net width covered per sheet of galvanized corrugated steel2 Table 2 Types of material and weights of zinc coating2 Table 3 Approximate weight of sheet
12、ing for 76-2 mm and 127 mm corrugations per square metre asfixed (including side and end laps)3 Table 4 Properties of corrugated sheets4 Table 5 Maximum permissible purlin spacings for limiting stress and deflection for pitched roofs5 Table 6 Flow capacities for level gutters with outlet at one end6
13、 Table 7 Recommended downpipe sizes (diameters) for level and sloping gutters6 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:07:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CP 143-10:1973 BSI 04-2000iii Foreword Th
14、is metric edition of Part 2 of CP 143, which has been designated Part 10, is the metric version of that published in imperial units in 1961. Part 10 has been prepared as part of the change to the metric system and gives values in SI units; it is not a complete technical revision. PD 6030, “Programme
15、 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 of dimensions where appropriate. According to the recommendations of Technical Committee B/94 set out in PD 6432, “Dimensional
16、co-ordination in building. Arrangement of building components and assemblies within functional groups,” corrugated sheet materials are classified as grade B components. In recognition of the wide variety of materials and profiles used as roof and wall cladding a special investigation panel B/-/12 wa
17、s 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 spread over a period of several years. Long-term recommendations laid stress on the importance of “cover width” as the co-ord
18、inating 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 for the existing profiles, as a first stage towards the use of the “cover width” for dimensional co-ordination. This Code of
19、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 requirements. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 14, an
20、 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 the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:07:39 G
21、MT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:07:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CP 143-10:1973 BSI 04-20001 1 General 1.1 Scope This Code deals with the use of galvanized corrugated steel she
22、ets for roofing and cladding in building. It does not refer to standardized forms of building which are already covered by other British Standards, e.g. in BS 1754. Recommendations are given on materials and design, construction and maintenance, together with information on weathertightness, durabil
23、ity, thermal insulation, fire hazard, rainwater drainage from roofs and other characteristics. NOTEThe titles of the British Standards referred to in this standard are listed on the inside back cover. 1.2 Definitions The terms used throughout this Code have the meaning assigned to them in BS 2717. 1
24、.3 Exchange of information and time schedule The working drawings and specification should be prepared in sufficient detail to afford proper guidance in the preparation of estimates and the execution of the work. Where bills of quantities form part of the contract, they should be prepared in accorda
25、nce 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 exchange of information between all concerned with the roofing and the work adjacent to it in sufficient time to ensure that the covering
26、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 rainwater disposal. Roof covering should be completed before internal finishes are begun. 2 Materials, appliances and components 2.1 Galvani
27、zed corrugated steel sheets Galvanized corrugated steel sheets used in constructing roofs and sides of buildings in accordance with the recommendations of this Code are to comply with the requirements of BS 3083. Where a profile other than a corrugated sheet is required, the quality requirements are
28、 to comply with BS 3083. 2.2 Profiles and dimensions of galvanized corrugated steel sheets The most commonly used profile is the 76.2 mm corrugation with either eight or ten corrugations per sheet; the profiles are shown diagrammatically in Figure 1. The dimensions and the net width covered per shee
29、t 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 for the purlin spacing adopted. 2.3 Accessories and fittings A wide range of galvanized steel sheet roofing accessories are made by the s
30、heet producers and can be obtained from them or through builders merchants. Special fittings to meet specific purposes may be obtained from constructional and sheet metal engineers. Where continuously galvanized steel sheet is used to construct these accessories it should comply with the requirement
31、s of BS 2989. 2.4 Fixing accessories Hook bolts, drive screws, bolts, nuts, rivets and washers should comply with the requirements of BS 1494. Any other fixings required should be of similar quality, and care should be taken in their design to ensure that they do not impair the efficiency of the roo
32、f 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 Flashings Where zinc and lead sheets are used for flashings they should comply with the following requirements: 1) Zinc. BS 849 and not lig
33、hter than 0.813 mm (14 zinc gauge). 2) Lead. BS 1178 and not less than the following thicknesses a) gutters: BS Gauge No. 6. b) flashings: BS Gauge No. 4. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:07:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CP 143-
34、10:1973 2 BSI 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 BS 1091. Where manufactured from continuously galvanized sheet, material should comply with the req
35、uirements of BS 2989. 2.8 Walkways Permanent walkways, where required, should be of durable material and designed to take a maintenance load equivalent to 890 N concentrated centrally to produce the worst conditions of loading. 3 Design considerations 3.1 General To secure maximum economy the roof p
36、lan should be 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 pollute
37、d or damp atmospheres, they should be painted at regular intervals of time. (See Section 6.) Four weights of zinc coating are specified in BS 3083; see Table 2. Selection of a suitable weight of zinc coating should take account of the service conditions of the cladding and local atmospheric conditio
38、ns which should be stated when ordering the sheets, and the manufacturers advice obtained. Table 2 Types of material and weights of zinc coating 3.3 Weathertightness Galvanized corrugated steel sheet roofs provide good weathertightness. The principal factors affecting weathertightness of roofs cover
39、ed with the material are as follows. 1) End lap. End laps should be a minimum of 150 mm for slopes of 20 and over with a minimum of 100 mm for vertical falls. Flatter slopes, especially on wide buildings and where exposed to driving rain, may require end lap greater than 150 mm and sealing with mast
40、ic. 2) Side lap. Side 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 76.2 mm corrugation. Where weather conditions are moderate, a lap of one-and-a-half corrugations may be used by turn
41、ing alternate sheets upside 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 includ
42、ing laps. 1 Corrugation1“ Corrugations2 Corrugations Min. Work size Max.Min. Work size Max.Min. Work size Max. mmmmmmmmmmmmmmmmmmmmmmmm 8/3 in660.476.219605610615567572577528533538 10/3 in812.876.219757762767719724729681686691 12/3 in966.276.219908914920870876882832838844 5/5 in711.212732630635640 6
43、/5 in838.212732757762767 NOTELength. Galvanized corrugated steel sheets are normally stocked in lengths from 1 200 mm rising in intervals of 150 mm to 3 650 mm. Longer lengths up to 7 600 mm may be specially obtained. Type Weight of zinc coatinga Min.Max. g/m2g/m2 125 150 180 200 381 458 550 610 455
44、 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. Licensed Copy: London South Bank University, London South Bank University, Tue Dec
45、12 06:07:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CP 143-10:1973 BSI 04-20003 3) Accessories. Whenever 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 join
46、t. 4) Rainwater discharging on the roof. No gutter or rainwater pipe should be allowed to discharge on 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
47、 by the use of insulating material laid either between the purlins and the sheeting or under the purlins, 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 n
48、o contribution to a fire. Structures incorporating galvanized corrugated steel sheet may be designed to 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
49、 of the under side of the roof. This may be effected by laying the sheets with a gap between them made 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 interior of the building. This can be an impervious membrane or a sprayed “cocoon”. The additional precaution of providing ventilation