1、BRITISH STANDARD BS 743:1970 Incorporating Amendment Nos. 1, 2, 3 and 4 Specification for Materials for damp-proof courses UDC 699:82:691BS743:1970 This British Standard, having been approved by the BuildingDivisional Council, waspublished under the authorityof the Executive Boardon 30 October1970 B
2、SI 03-2000 First published July 1937 First revision March 1941 Second revision March 1951 Third revision September 1966 Fourth revision October 1970 The following BSI references relate to the work on this standard: Committee reference B/34 70/6015 ISBN 0 580 06214 7 Co-operating organizations The co
3、mmittee responsible for the preparation of this British Standard consists of representatives of the following Government departments and scientific and industrial organizations: Association of British Roofing Felt Manufacturers Ltd. British Lead Manufacturers Association British Non-Ferrous Metals F
4、ederation British Paper and Board Makers Association British Plastics Federation Confederation of British Industry Copper Development Association English Slate Quarries Association Greater London Council Institute of Petroleum Institution of Municipal Engineers Lead Development Association Mastic As
5、phalt Council and Employers Federation Ministry of Public Building and Works Ministry of Public Building and Works Building Research Station National Federation of Building Trades Employers National Federation of Clay Industries North Wales Slate Quarries Association Royal Institute of British Archi
6、tects Royal Institution of Chartered Surveyors Amendments issued since publication Amd. No. Date of issue Comments 2503 March 1978 4336 September 1983 4594 October 1984 6579 January 1991 Indicated by a sideline in the marginBS743:1970 BSI 03-2000 i Contents Page Co-operating organizations Inside fro
7、nt cover Foreword ii 1 Scope 1 2 Lead 1 3 Copper 1 4 Bitumen 1 5 Mastic asphalt 1 6 Polyethylene 1 7 Slates 1 8 Bricks 1 9 Mortar 2 10 Designation for ordering 2 Appendix A Text deleted 3 Appendix B Text deleted 3 Appendix C Text deleted 3BS743:1970 ii BSI 03-2000 Foreword This standard makes refere
8、nce to the following British Standards and Special Publication: BS 12, Portland cement (ordinary and rapid-hardening). BS 146, Portland-blastfurnace cement. BS 410, Test sieves. BS 598, Sampling and examination of bituminous mixtures for roads and buildings. BS 890, Building limes. BS 1097, Mastic a
9、sphalt for tanking and damp-proof courses (limestone aggregate). Included in BS 988, BS 1097, BS 1076, BS 1451. Mastic asphalt for building (limestone aggregate). BS 1178, Milled lead sheet and strip for building purposes. BS 1200, Sands for mortar for plain and reinforced brick-work; blockwalling a
10、nd masonry. (Included in BS 1198-1200. Building sands from natural sources). BS 1418, Mastic asphalt for tanking and damp-proof courses (natural rock asphalt aggregate). Included in BS 1162, BS 1410, BS 1418. Mastic asphalt for building (natural rock asphalt aggregate). BS 2870, Rolled copper and co
11、pper alloys, sheet strip and foil. BS 3235, Test methods for bitumen. BS 3921, Clay bricks and blocks. BS 4027, Sulphate-resisting Portland cement. BS 5642, Sills and copings Part 1: Specification for window sills of precast concrete, cast stone, clayware, slate and natural stone. BS 6398, Specifica
12、tion for bitumen damp-proof courses for masonry. BS 6515, Specification for polyethylene damp-proof courses for masonry. BS 8215, Code of practice for design and installation of damp-proof courses in masonry construction. CP 3, Code of basic data for the design of buildings Chapter IX: Durability. D
13、D 86, Damp-proof courses. This metric revision of BS 743 has been prepared under the authority of the Building Divisional Council, as part of the change to the metric system in the construction industry, giving values in terms of SI units. For further information on SI units, reference should be mad
14、e to PD5686 1) . This standard will eventually be superseded by new or existing standards covering the following classes of material for damp-proof courses: 1) Lead and copper, sheet thicknesses. 2) Bitumen damp-proof sheeting with varying base materials, indicating the filler content and the maximu
15、m softening point of the coating bitumen on the addition of filler. 3) Mastic asphalts, suitable for damp-proof courses. 4) Low density black polythene sheeting. 5) Materials used in mortars for bedding damp-proof courses, ordinary, rapid hardening, blastfurnace and sulphate resistant cements. Build
16、ing limes and sands. 6) Slates, with the requirements for “wetting and drying” and sulphuric acid immersion tests. 7) Bricks and blocks manufactured from fired brickearth, clay or shale. 1) PD 5686, “The use of SI units”.BS743:1970 BSI 03-2000 iii Research is in progress to develop test methods as a
17、 basis for future performance based specifications for damp-proof courses (see DD86). Guidance on the design and installation of damp-proof courses is given in BS8215. The importance of correct laying is emphasized since the efficiency of the damp-proof course depends as much on the method of use an
18、d workmanship employed as upon the intrinsic quality of the materials. In particular, the composition of the mortar and the workmanship used for bedding bricks and slates is of great importance when laying damp-proof courses near ground level. Materials used as damp-proof courses in walls constructe
19、d with modular components designed in accordance with BS 4330 2)and PD 6444 3)should have widths in accordance with BS 4011 4) . A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compli
20、ance 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, pages1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have h
21、ad amendments incorporated. This will be indicated in the amendment table on the inside front cover. 2) BS 4330, “Recommendations for the co-ordination of dimensions in building. Controlling dimensions”. 3) PD 6444, “Recommendations for the co-ordination of dimensions in building. Basic space for st
22、ructure, external envelope and internal sub-division”. 4) BS 4011, “Recommendations for the co-ordination of dimensions in building. Basic sizes for building components and assemblies”.iv blankBS743:1970 BSI 03-2000 1 1 Scope This British Standard specifies requirements for the following materials s
23、uitable for use in the construction of damp-proof courses: Lead Copper Bitumen Mastic asphalt Polythene Slates Bricks Materials for mortar 2 Lead Lead for use as a damp-proof course material shall comply with the requirements of BS1178 5)and shall weigh not less than19.5kg/m 2(CodeNo.4:1.80mm thickn
24、ess). 3 Copper Copper for use as a damp-proof course material shall comply with the requirements of sections 2 and7 of BS2870:1980 6)for temper grade0(annealed) and shall be of minimum thickness0.25mm. NOTE 1If joints are to be welted grade C106should be specified. NOTE 2Where the d.p.c. projects fr
25、om the wall to form a drip or flashing the minimum thickness of the piece forming the drip or flashing should be increased to0.50mm. 4 Bitumen Bitumen damp-proof courses for masonry shall comply with the requirements of BS 6398 7) . Bitumen damp-proof sheeting shall comply with the appropriate requi
26、rements of BS6398 7)and shall have the following composition: Nominal mass per unit area of base = 0.24. Mass per unit area of base W 0.18 kg/m 2 . Mass per unit area of bituminous material W (2.6 + x) kg/m 2 . Mass of filler and surfacing within the range (1.7 + y) to (1.6 + x) kg/m 2 . Mass of ass
27、embled d.p.c. material W 5.4 kg/m 2 . NOTEWhen measured as described in A.1 of BS 6398:1983 7)x is equal to one-half of the excess mass of d.p.c. material and y is equal to one-third of the excess mass of d.p.c. material. 5 Mastic asphalt A damp-proof course of mastic asphalt shall comply with, one
28、of the following British Standards: BS 1097, “Mastic asphalt for tanking and damp-proof courses (lime-stone aggregate)”. BS 1418, “Mastic asphalt for tanking and damp-proof courses (natural rock asphalt aggregate)”. 6 Polyethylene Polyethylene damp-proof courses for masonry shall comply with the req
29、uirements of BS 6515 8) . 7 Slates Any slate used as a damp-proof course material shall be not less than230mm long, and have a minimum thickness of not less than4.0 mm. When tested by the wetting and drying test method described in Appendix B of BS 5642-1:1978 9) , it shall meet the requirements for
30、 Type B. When tested by the sulphuric acid immersion test method for Type B slates described in Appendix A of BS 5642-1:1978 9)damp-proof course slates shall show no signs of delamination along the edges when examined through a lens giving a magnification of about two diameters, nor of swelling, sof
31、tening or flaking of the surface, nor exhibit gaseous evolution during immersions. A slate damp-proof course shall consist of at least two courses of slates laid to break joint, each slate being bedded in1:0to 1 / 4 :3cement/lime/sand in accordance with BS8215. 8 Bricks Bricks shall be fired-clay br
32、icks complying with the requirements for damp-proof course bricks in BS3921 10) . A brick damp-proof course shall consist of at least two courses of brick laid to break joint, each brick being bedded in1:0to 1 / 4 :3 cement/lime/sand in accordance with BS8215. 5) BS 1178, “Milled lead sheet and stri
33、p for building purposes”. 6) BS 2870, “Rolled copper and copper alloys, sheet strip and foil”. 7) BS 6398, “Specification for bitumen damp-proof courses for masonry”. 8) BS 6515, “Specification for damp-proof courses for masonry”. 9) BS 5642, “Sills and copings” Part 1 “Specification for window sill
34、s of precast concrete, cast stone, clayware, slate and natural stone”. 10) BS 3921, “Clay bricks and blocks”.BS743:1970 2 BSI 03-2000 9 Mortar The materials of mortar used for the bedding of damp-proof course materials shall comply with the relevant requirements of the following British Standards: B
35、S 12, “Portland cement (ordinary and rapid-hardening)”. BS 146, “Portland-blastfurnace cement”. BS 890, “Building limes”. BS 1200, “Sands for mortar for plain and reinforced brickwork; block-walling and masonry”. BS 4027, “Sulphate-resisting Portland cement”. 10 Designation for ordering When designa
36、ting damp-proof course materials for the purposes of an enquiry or order, the following information shall be given: 1) Material and, in the case of bitumen, type letter. 2) British Standard number,i.e.BS743. 3) Width, where applicable. 4) Length or weight or number required, as appropriate.BS743:197
37、0 BSI 03-2000 Appendix A Text deleted Appendix B Text deleted Appendix C Text deleted4 blankBS743:1970 BSI 03-2000 British Standards Institution The following are available on application: YEARBOOK Including subject index and numerical list of British Standards SECTIONAL LISTS. Gratis. Acoustics (SL
38、 10) Aerospace materials and components (SL 25) Automobile (SL 34) British Standards Handbooks (SL 27) Building (SL 16) Chemical Engineering (SL 5) Chemicals, fats, glues, oils, soap, etc. (SL 4) Cinematography and photography (SL 1) Coal, coke and colliery requisites (SL 13) Codes of Practice (SL 8
39、) Consumer goods (SL 3) Documentation, including Universal Decimal Classification (SL 35) Drawing practice (SL 37) Electrical engineering (SL 26) Farming, dairying and allied interests (SL 31) Furniture, bedding and furnishings (SL 11) Gardening, horticulture and landscape work (SL 41) Gas and solid
40、 fuel and refractories (SL 2) Glassware, excluding laboratory apparatus (SL 39) Heating, ventilating and air conditioning (SL 42) Hospital equipment (SL 18) Illumination and lighting fittings (SL 14) Industrial instruments, etc. (SL 17) Iron and steel (SL 24) Laboratory apparatus (SL 23) Leather, pl
41、astics, rubber (SL 12) Local authority purchasing officers guide (SL 28) Machine tools (SL 20) Mechanical engineering (SL 6) Nomenclature, symbols and abbreviations (SL 29) Non-ferrous metals (SL 19) Nuclear energy (SL 36) Packaging and containers (SL 15) Paints, varnishes, paint ingredients and col
42、ours for paints (SL 9) Personal safety equipment (SL 30) Petroleum industry (SL 38) Printing and stationery, paper and boards (SL 22) Road engineering (SL 32) Shipbuilding (SL 40) Textiles and clothing (SL 33) Welding (SL 7)BS 743:1970 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInst
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