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1、BRITISH STANDARD CP 143-12: 1970 Incorporating Amendment Nos. 1 and 2 Code of practice Sheet roof and wall coverings Part 12: Copper: Metric units Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:08:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CP 143-12:1970
2、This part of this Code of Practice has been prepared by a committee convened by the Codes of Practice Committee for Building. It was published under the authority of the Executive Board on 31 July 1970 BSI 08-1999 First published April 1960 as Part 4 imperial units. Published in metric form as Part
3、12 July 1970 Part 12 incorporates the amendment to CP 143 issued in October 1961 (PD 4348) The following BSI reference relates to the work on this Code of Practice: Committee reference BLCP/4/4 ISBN 580 06281 3 Sub-Committee BLCP/4/4 Copper roof coverings Chair Vacant Dr. E. CarrCopper Development A
4、ssociation DirectorBuilding Research Station, Ministry of Public Building and Works Mr. C. E. CannonsInstitution of Structural Engineers ED 3AMinistry of Public Building and Works Mr. A. J. Burling, J.P.National Federation of Building Trade Employers Mr. C. W. HuttonRoyal Institute of British Archit
5、ects Mr. B. C. Britton Mr. F. J. CaveThe Royal Institution of Chartered Surveyors Mr. G. Tulley Mr. R. M. EdwardsAssociation of British Roofing Felt Manufacturers Amendments issued since publication Amd. No.Date of issueComments 863February 1972 5193January 1987Indicated by a sideline in the margin
6、Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:08:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CP 143-12:1970 BSI 08-1999i Contents Page Forewordiii 1General1 1.1Scope1 1.2Definitions1 1.3Exchange of information and time schedule2 2Materials, appliances and
7、 components2 2.1Characteristics of material2 2.2Copper2 2.3Nails2 2.4Screws2 2.5Felt2 2.6Solder2 3Design considerations2 3.1Durability2 3.2Substructure3 3.3Types of copper roof and wall covering4 3.4Copper roof coverings4 3.5Rolls4 3.6Special features4 3.7Thermal insulation5 3.8Ventilation5 3.9Fire
8、resistance5 3.10 Weight5 3.11 Protection against lightning5 4Methods of laying and workmanship5 4.1Protection and storage5 4.2Preparatory work5 4.3Sequence of operations5 4.4Setting out the work5 4.5Felting5 4.6Technique of laying copper sheeting6 4.7Standing seams6 4.8Roll system6 4.9Parapet and bo
9、x gutters6 4.10 Cesspools6 4.11 Details6 5Inspection and testing7 5.1Preparatory work7 5.2Work in progress7 5.3Completion7 Appendix A Table of approximate weights of cladding sheet8 Appendix B Properties of copper8 Appendix C Table of dimensional details for copper gutters8 Figure 1 General layout f
10、or standing seam and details9 Figure 2 General layout for common roll10 Figure 3 Detail of roll ends11 Figure 4 Detail of ridge and hip for common roll12 Figure 5 Common roll13 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:08:39 GMT+00:00 2006, Uncontrolled
11、 Copy, (c) BSI CP 143-12:1970 ii BSI 08-1999 Page Figure 6 Single lock welt13 Figure 7 Double lock cross welt13 Figure 8 Standing seam13 Figure 9 Standing seam and upstand14 Figure 10 Flattened standing seam15 Figure 11 Standing seam ridge16 Figure 12 Gutter and outlet. Isometric sketch showing a ty
12、pical arrangement17 Figure 13 Gutter to roof covered with slates or tiles18 Figure 14 Lining plate18 Figure 15 Tiled or slated roof discharging on copper flat19 Figure 16 Copper roof discharging on slates or tiles19 Figure 17 Common roll to vertical upstand20 Figure 18 Internal corner, common roll21
13、 Figure 19 Drips22 Figure 20 Standing seam internal corner23 Table 1 Maximum bay widths and lengths to be used with various thicknesses of cladding sheet5 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:08:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CP 143-
14、12:1970 BSI 08-1999iii Foreword This part of the Code of Practice makes reference to the following British Standards and Codes of Practice: BS 219, Soft solders. BS 747, Roofing felts. BS 1210, Wood screws. BS 476, Fire tests on building materials and structures Part 3: External fire exposure roof t
15、est. BS 2870, Specification for rolled copper and copper alloys: sheet, strip and foil. BS 5268, Structural use of timber Part 2: Code of practice for permissible stress design, materials and workmanship Part 5: Preservative treatments for constructional timber. CP 326, The protection of structures
16、against lightning. This metric edition of CP 143, which has been designated Part 12, is the metric version of Part 4 published in imperial units in April 1960. Part 12 is not a technical revision of the Code and has been prepared as part of the change to the metric system in the Construction Industr
17、y, giving values in SI units. For further information on SI units, reference should be made to BS 3763, “International System (SI) units”, and PD 5686, “The use of SI units”. Wherever it has been necessary to apply dimensional co-ordination, recommendations of Technical Committee B/94, Modular Co-or
18、dination in Building, have been reflected in this metric version. For further information on dimensional co-ordination reference should be made to BS 4011, “Recommendations for the co-ordination of dimensions in building. Basic sizes for building components and assemblies”, BS 4330, “Recommendations
19、 for the co-ordination of dimensions in building. Controlling dimensions”, and PD 6444, “Basic spaces for structure, external envelope and internal sub-division”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for
20、 their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 23 and a back cover. This standard has been updated (see copyright date)
21、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 06:08:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank Unive
22、rsity, London South Bank University, Tue Dec 12 06:08:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CP 143-12:1970 BSI 08-19991 1 General 1.1 Scope This Code deals with methods of covering a roof or wall with copper sheet or strip in accordance with established practice. There are alternative method
23、s of laying which are not included in the techniques described, as they are generally variations of traditional roof practice. Recommendations are given in regard to the whole of the coverings above the wooden rafters for pitched roofs, and above the joists or the upper surface of the constructional
24、 base for flat roofs and walls. Flashings and gutters are dealt with in so far as they are integral parts of the covering. The dimensional co-ordination recommendations of Technical Committee B/94, Modular Co-ordination in Building, are embodied where appropriate to the Code. 1.2 Definitions For the
25、 purposes of this Code the following definitions apply. 1.2.1 bay a unit of sheet covering as laid between rolls or standing seams 1.2.2 capping a copper strip, covering the top of a batten roll, welted to the edges of the sheets which are dressed up the side of the roll 1.2.3 clips copper strips, c
26、ut to lengths to suit roll or seam, placed at intervals and securely fixed to the roof base, the ends being welted in with the edges of the sheets to hold the cladding in position 1.2.4 corner block a short triangular wooden fillet tapered in its length, fixed against abutments, where sheets termina
27、te at drips on roofs, walls and gutters 1.2.5 dog-ear a box-like corner of three dimensions formed by folding a flat copper sheet without cutting 1.2.6 drip a step formed in a flat roof or gutter across the direction of the fall 1.2.7 drop apron a separate piece of copper fixed at the verges, eaves
28、or gutters, to form a weathering and welted to the roof sheeting 1.2.8 lining plate a strip of copper of suitable width which is nailed to the eaves or verges of a roof and engaged with the lower edge of the drop apron to form a secure fixing 1.2.9 lock joint a single or double welted joint 1.2.10 p
29、atina the thin stable insoluble film which forms on copper on exposure to air. The film consists of some combination of copper oxide, copper sulphate, copper carbonate and copper chloride, depending on atmospheric conditions. The colour varies from black to green according to the relative proportion
30、s of the compounds present 1.2.11 roll, common a shaped core against the sides of which the copper bays are dressed or are turned up 1.2.12 roll, ridge and hip a shaped core at ridge and hip against which the copper is dressed or is turned up 1.2.13 saddle end the completion of a batten roll coverin
31、g or a standing seam against an abutment 1.2.14 spring the bending of the substructure under load stress and recovery after removal 1.2.15 standing seam a double welted joint formed between the sides of adjacent bays and left standing 1.2.16 stop end (roll or seam) the completion of a batten roll co
32、vering or standing seam at a drip or eaves Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:08:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CP 143-12:1970 2 BSI 08-1999 1.2.17 welting joining copper sheets at their edges by means of folding. Welting may be by
33、 single or double folds, such joints being termed single or double welts respectively 1.2.18 work hardening the reduction of ductility caused by bending or working during manipulation or by movement in service 1.3 Exchange of information and time schedule The working drawings and specification shoul
34、d 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 accordance with the Standard Method of Measurement for Building Works or the Scottish Mode for t
35、he Measurement of Building Works, as appropriate. There should be a full exchange of information between all concerned with the cladding 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 provision for fixing has b
36、een made in advance. Early arrangements should be made on the site for rainwater disposal. Cladding should be completed before internal finishes are begun. 2 Materials, appliances and components 2.1 Characteristics of material Bright copper changes colour when exposed to the air. This discoloration
37、is due to the formation of an oxide film which is an important agent in protecting the copper. The preliminary oxidizing process is the first step in the formation of a patina. This patina is usually a bright green colour (considered an enhancement to architectural effect in certain circumstances) b
38、ut, in some atmospheres, it may be masked to a buff, brown or black colour, dependent on the quantities and nature of the impurities deposited on the surface from the atmosphere. (The patina should not be confused with “verdigris”, which is also of a green or grey colour and is formed by different c
39、hemical reaction.) 2.2 Copper The whole of the cladding including clips, flashings, lining-plates, saddle ends, etc., should be made from copper sheet or strip conforming to BS 28701). The correct sizes and gauges are given in Table 1. 2.3 Nails Nails used in securing the copper clips and the felt u
40、nderlay should be made from copper wire not less than 2.6 mm thick. The nails should be not less than 25 mm long measured under the head and weigh not less than 1.5 kg per 1 000. The heads should be flat and not less than 6 mm diameter and the shanks barbed throughout their length. 2.4 Screws Screws
41、 used in securing clips or other components should be made of brass. Where screws are used to secure rolls, steel screws may be used. All screws should conform to the relevant requirements of BS 1210.2) 2.5 Felt The felt may be either BS 7473), Type 4A (ii) Brown No. 1 Inodorous, or a similar felt w
42、hich will not adhere to the metal or understructure under temperature changes. 2.6 Solder For the jointing of eaves, gutters and outlets from cesspools, solder should conform to the requirements of BS 2194), Grade A. See also 4.11.5. 3 Design considerations 3.1 Durability Copper possesses good mecha
43、nical properties and has ample strength for roofing purposes. Copper is very resistant to corrosion by atmosphere and normal building materials. Some new materials may contain agents which are active under certain conditions, and advice as to their suitability should be sought from the copper claddi
44、ng contractor. Its life is equal to and often longer than that of other building materials with which it may be used. The durability of a copper roof covering is dependent upon physical considerations such as thickness, mechanical properties and practical methods of fixing and upon resistance to cor
45、rosion. Metals other than lead may suffer from electrolytic corrosion if placed in contact with copper. 1) BS 2870, “Specification for rolled copper and copper alloys: sheet, strip and foil”. 2) BS 1210, “Wood screws”. 3) BS 747, “Roofing felts”. 4) BS 219, “Soft solders”. Licensed Copy: London Sout
46、h Bank University, London South Bank University, Tue Dec 12 06:08:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CP 143-12:1970 BSI 08-19993 3.2 Substructure 3.2.1 General. It is important that the fixings for sheet copper coverings are as permanent as the metal itself. Cellular or foam concrete does
47、 not present a good fixing for items such as screws or nails that secure copper clips for rolls, drips or welts. Suitably treated wood rolls and drip edges, firmly cross spiked to the concrete, should be used. Where a layer of hard board is used to cover poorly surfaced timber or over rough faced co
48、ncrete the fixings for the sheet copper must penetrate the hard board and be secured to the substructure. Where copper sheet is laid on insulating material such as compressed cork or open textured fibreboard, the method of securing the insulating material and the copper sheet should be agreed with t
49、he cladding contractor. An underlay of felt (see 2.5) is necessary to provide a sympathetic surface upon which to lay copper. This will give a barrier between the copper and the substructure and provide a measure of sound and thermal insulation. 3.2.2 Concrete. The surface should be laid to even and correct falls and be provided with a smooth, firm surface. Certain screeds such as those having a sulphate content require a sealing coat of bitumen. Reference may be made to Building Research Station Digests No. 110 and No