1、CODE OF PRACTICE CONFIRMED AUGUST1986 CP143-15: 1973 Code of Practice for Sheet roof and wall coverings Part15: Aluminium Metric units UDC 69.024.156:691.771-41:669.717+69.022.325:691.77-41:669.717CP143-15:1973 This Part of this Code of Practice has been prepared by a committeeconvened by the Codeso
2、f Practice Committee forBuilding. Having been endorsed by the Council for Codesof Practice, it was publishedunder the authority ofthe Executive Board on 26January1973 BSI02-2000 The following BSI references relate to the work on this standard: Committee reference BLCP/4/2 Draft for approval71/11120
3、ISBN 0 580 07359 9 Drafting subcommittee BLCP/4/2 Aluminium roof coverings Chair: Vacant Miss F. F. Aston Mr H. W. Barker Aluminium Federation Mr F. C. Clarke Mr S. G. Clements Mr K. Ewing Mr F. T. Atkins Association of British Roofing Felt Manufacturers Mr R. M. Fdwards Mr G. D. Binns Department of
4、 the Environment Mr L. Nicholson Metal Roofing Contractors Association Mr H. Strachan Mr E. Thompson National Federation of Building Trades Employers Mr N. K. Green BritishStandards Institution Amendments issued since publication Amd. No. Date of issue Comments 4473 March1984 Indicated by a sideline
5、 in the marginCP143-15:1973 BSI 02-2000 i Contents Page Drafting subcommittee BLCP/4/2 Inside front cover Foreword iii 1 General 1 1.1 Scope 1 1.2 Definitions 1 1.3 Exchange of information and time schedule 1 2 Materials and fastenings 1 2.1 Aluminium 1 2.2 Underlays 2 2.3 Timber 2 2.4 Nails 3 2.5 S
6、crews and bolts 3 3 Design considerations 3 3.1 Characteristics of the material 3 3.2 Weight of aluminium roof coverings 4 3.3 Substructure 4 3.4 Underlays 5 3.5 Clips 5 3.6 Roofing systems 5 3.7 Traditional standing seam and batten roll systems 6 3.8 Long strip system 6 3.9 Falls, drips and cross w
7、elts on roofs 7 3.10 Falls and drips in gutters 7 3.11 Special details and features 8 3.12 Condensation 8 3.13 Fire protection 8 3.14 Protection against lightning 8 4 Laying procedure 8 4.1 Storage and protection of aluminium 8 4.2 Preparatory work 8 4.3 Underlays 8 4.4 Technique of laying aluminium
8、 sheeting 9 4.5 Cesspools 9 4.6 Gutters 9 4.7 Aprons 9 4.8 Main roof covering 9 4.9 Cover flashings 10 4.10 Drainage 10 4.11 Other building operations 10 5 Inspection and tests 10 5.1 Materials 10 5.2 Substructures 10 5.3 Underlays 10 5.4 Final inspection 11 5.5 Maintenance 11 Figure 1 General layou
9、t and details of the standing seam system applied to flat roofs 11CP143-15:1973 BSI 02-2000 ii Page Figure 2 General layout and details of the standing seam system applied to pitched roofs 12 Figure 3 Plain clips and expansion clips 13 Figure 4 Stages in forming standing seam 13 Figure 5 Single-lock
10、 welt 14 Figure 6 Double-lock welt 15 Figure 7 Standing seam: upstand at wall abutment 15 Figure 8 Detail: standing seam at ridge roll; traditional and long strip systems 16 Figure 9 Eaves detail: traditional systems 16 Figure 10 Verge detail: traditional and long strip systems 17 Figure 11 Expansio
11、n detail at eaves: long strip system 17 Figure 12 Detail of drip 18 Figure 13 General layout and details of batten roll system applied to flat roofs 19 Figure 14 General layout and details of batten roll system applied to pitched roofs 20 Figure 15 Stages in forming batten roll 21 Figure 16 Detail o
12、f ridge roll 21 Figure 17 Stages in forming batten roll at upstand 22 Figure 18 Gutter for slated or tiled roof 22 Figure 19 Gutter between slated roofs 23 Figure 20 Slated or tiled roof discharging on to aluminium flat roof 23 Figure 21 Aluminium roof discharging on to slated or tiled roof 23 Figur
13、e 22 Parapet gutter 24 Figure 23 Parapet gutter and chute or cesspool outlet 24 Figure 24 Detail: chimney weathering 25 Table 1 Tensile strength of materials complying with the requirements of BS1470 in tempers recommended for roofing 2 Table 2 Some physical properties of99 grade aluminium 2 Table 3
14、 Roofing sizes of strip in coil 2 Table 4 Recommended tempers for aluminium of different purities and NS3 alloy 3 Table 5 Weights of aluminium roof coverings 4 Table 6 Thickness and weight of aluminium sheet and strip 5 Table 7 Pitched roofs over10 pitch: maximum length of sheet or strip 6 Table 8 F
15、lat roofs up to and including10 pitch: maximum length of sheet or strip 6 Table 9 Recommended maximum width of strip for long strip system 7 Table 10 Recommended maximum lengths of linings for gutters of various sizes and widths 10 Publications referred to Inside back coverCP143-15:1973 BSI 02-2000
16、iii Foreword This metric edition of CP143, which has been designated Part15, is the metric version of Part7 which was published in imperial units in1965. It has been prepared as part of the change to the metric system in the construction industry, giving values in SI units, for further information o
17、n which reference should be made to BS3763, “The International System of units (SI)”. While Part15 is not a technical revision, the opportunity has been taken to make certain changes based on experience gained since the imperial units edition was published. For example, recommendations have been alt
18、ered regarding underlays, use of clips in cross welts and use of expansion clips in long seams. Wherever it has been necessary to apply dimensional co-ordination, recommendations of Technical Committee B/94, set out in PD6432, “Recommendations for the co-ordination of dimensions in building. Arrange
19、ment of building components and assemblies within functional groups”, have been reflected in this metric version. For further information on dimensional co-ordination reference should be made to BS4011, “Recommendations for the co-ordination of dimensions in building. Basic sizes for building compon
20、ents and assemblies”, BS4330, “Recommendations for the co-ordination of dimensions in building. Controlling dimensions”, and PD6444, “Recommendations for the co-ordination of dimensions in building”, Part1, “Basic spaces for structure, external envelope and internal sub-division”. This Code of Pract
21、ice represents a standard of good practice; compliance with it does not confer immunity under relevant legal and statutory requirements, including byelaws. Summary of pages This document comprises a front cover, an inside front cover, pagesi to iv, pages1to26, an inside back cover and a back cover.
22、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.iv blankCP143-15:1973 BSI 02-2000 1 1 General 1.1 Scope This Code of Practice gives recommendations for the installation of aluminium
23、fully supported roof and wall coverings in accordance with established practices. It includes information on appropriate alloys and forms of aluminium, durability, contact with other materials, sizes and weights of sheet and strip, protection and storage. Gutters and flashings are dealt with in so f
24、ar as they form an integral part of the main roof covering. The Code deals with coverings, substructures and accessories placed above the rafters or the upper surface of constructional bases, but does not apply to aluminium roof decking or deck units. NOTEThe titles of the BritishStandards referred
25、to in this Code of Practice are listed on the inside back cover. 1.2 Definitions For the purposes of this Code of Practice the definitions given in BS2717, together with the following, apply: aluminium aluminium and aluminium alloys complying with the requirements of BS1470, BS1471, BS1473, BS1474 a
26、nd BS1490 butt jointing edge to edge method of laying felt underlay to provide an even laying surface for the roof covering corner fillet triangular tapered fillet or block fixed against an abutment at drips on roofs and in gutters dovetail battens and blocks wooden battens and blocks set in concret
27、e roofs to which clips or rolls are secured dressing beating of sheet to the required shape saddle end the completion of a batten roll covering, or a standing seam against an abutment springback amount of elastic recovery after a bending or forming operation work-hardening the increase of strength a
28、nd reduction of ductility produced by cold-working as with bending or forming or by movement in service 1.3 Exchange of information and time schedule The working drawings and specifications should be prepared in sufficient detail to afford proper guidance in the preparation of estimates and the exec
29、ution 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 exchange of information between
30、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 scheduled time and that all necessary provision for fixing has been made in advance. Early arrangements should be made on the site for rainwater disposal. Roof coverin
31、g should be completed before internal finishes are begun and, to avoid damage to finished work, upper roofs should be completed first. For safety requirements in site work reference should be made to the following. Factories Act1961 Health and Safety at Work etc. Act1974 Construction (General Provis
32、ions) Regulations1961 Construction (Health and Welfare) Regulations1966 Construction (Lifting Operations) Regulations1961 Construction (Working Places) Regulations1966. Scaffolding shall be provided which permits ready access to all parts of the surfaces of the roof. In addition, suitable ladders or
33、 crawling boards should be used when preparing the roofing structure to receive the underlay and when placing the underlay and fixing the roof covering. If required by the Regulations a barrier should be provided at the lower edge of the sloping surface to prevent any person or material falling ther
34、efrom. In some circumstances the upper lift of a scaffold may be suitable as an eaves barrier. 2 Materials and fastenings 2.1 Aluminium The whole of the sheet and strip used for roof covering, including flashings, drop aprons, lining plates, clips, etc., should comply with the requirements of BS1470
35、, and the tensile strengths of the materials in the tempers recommended for roofing are given in Table 1. CP143-15:1973 2 BSI 02-2000 Table 1 Tensile strength of materials complying with the requirements of BS1470 in tempers recommended for roofing Table 2 Some physical properties of99 grade alumini
36、um (S1C) Thermal conductivity of aluminium is high, but the reflectivity of its surface to radiant heat is also high and is taken into account in calculating the thermal resistance of roofs. Roofing sizes of aluminium strip in coil are given in Table 3. Table 3 Roofing sizes of strip in coil 2.2 Und
37、erlays The felt underlay to be used with timber substructures is Type4A(ii) brown sheathing felt No.1, inodorous, complying with the requirements of BS747. On concrete and screeded bases, and on materials other than timber,2000 gauge clear polyethylene sheeting should be used; seealso3.4. 2.3 Timber
38、 For structural aspects and the preservation of timber reference should be made to CP112 and BS5268-5. The timbers normally used for substructures suitable for aluminium are the European white or red woods. Advice on the use of other woods may be obtained from the aluminium manufacturer. NOTESome wo
39、od preservative treatments when applied to timber used in association with aluminium may be harmful to the metal. Thus care should be taken to ensure that such treatments, among the considerable number available, are suitable to aluminium in the particular application under consideration. Materials
40、and grade in accordance with BS1470 Temper Tensile strength ISO number S199.99 grade aluminium 0 a H2 b H4 N/mm 2up to65 6585 8095 AL99.99 S1A99.8 grade aluminium 0 H2 b H4 up to90 77100 95120 AL99.8 S1B99.5 grade aluminium 0 H2 b H4 5595 85108 100135 AL99.5 S1C99 grade aluminium 0 H2 H4 70105 95120
41、 110140 AL99.0 NS3 aluminium alloy (0.8% to1.5% manganese) 0 H2 H4 90130 120145 140175 AL Mn1 NOTEData on physical properties of aluminium are given in Table 2. a Used for flashings only. b Tempers for roofing sheet not included in BS1470. Density Melting point Specific heat(0 C to100 C) Coefficient
42、 of linear expansion Thermal conductivity 2710kg/m 3658 C 0.917kJ/(kg C) 24 10 6 C (between20 C and100 C) 226W/(m C) Width 450mm Thickness 0.8mmCP143-15:1973 BSI 02-2000 3 2.4 Nails Clout nails used for securing the aluminium clips and felt underlays should comply with the requirements of BS1202-3.
43、Galvanized steel wire clout nails complying with the requirements of BS1202-1 may also be used, but aluminium is preferred. Nails for fastening clips should be not less than25mm long and not less than3.25mm in diameter. Clout nails for fixing the felt underlay should be not less than20mm long and no
44、t less than3mm in diameter. Copper, brass or uncoated steel nails should not be used. 2.5 Screws and bolts Wood screws used for securing clips should be of aluminium alloy HB15, anodized and lanolin dipped, or of steel, zinc plated or sherardized. Wood screws should comply with relevant requirements
45、 of BS1210 and should be not less than25mm No.8. Bolts should be not less than4mm in diameter and of aluminium alloy or zinc-coated steel; screws and bolts should have countersunk heads. Screws or bolts for securing wood rolls may be of aluminium or zinc-coated steel. 3 Design considerations 3.1 Cha
46、racteristics of the material Aluminium combines ample strength and ductility for roof covering requirements and it does not “creep” on high pitched roofs and steeples. Hand-forming is easiest in the soft tempers and with the higher purity materials; the harder tempers of greater strength are more di
47、fficult to work by hand, but are suitable for machine forming. The recommended tempers are given in Table 4. Aluminium possesses good resistance to corrosion by the atmosphere and corrosive media normally encountered in service. Higher purity aluminium, which provides greater workability, is general
48、ly more resistant to corrosion than less pure metal, but has lower tensile strength. Aluminium and its alloys when in contact with certain other metals in the presence of moisture will set up or suffer electrolytic corrosion. It is important to avoid direct or indirect contact with copper, brass or
49、bronze; components made of these materials should not be used with aluminium roofing. Corrosion is less likely from contact with iron or steel than with copper-base metals but it is recommended that iron and steel be painted when in direct contact with aluminium. Water draining from copper on to aluminium will cause corrosion, but drainage in the opposite direction is harmless, providing there is no direct contact. Water draining from aluminium will not norma
