1、BRITISH STANDARD BS6398:1983 Specification for Bitumen damp-proof courses for masonry UDC699.822:691.16BS6398:1983 This British Standard, having been prepared under the directionof the Elements and Components (of Diverse Materials)for Buildings Standards Committee, was published under the authority
2、ofthe Board of BSI and comes intoeffect on 30September1983 BSI 04-1999 The following BSI references relate to the work on this standard: Committee reference ECB/44 Draft for comment81/10439DC ISBN 0 580 13401 6 Committees responsible for this British Standard The preparation of this British Standard
3、 was entrusted by the Elements and Components (of Diverse Materials) for Buildings Standards Committee(ECB/-)to Technical Committee ECB/44 upon which the following bodies were represented: Associated Lead Manufacturers Limited Association of British Roofing Felt Manufacturers Association of Jute Spi
4、nners and Manufacturers Autoclaved Aerated Concrete Products Association Brick Development Association British Board of Agrment British Engineering Brick Association British Lead Manufacturers Association British Plastics Federation Copper Development Association Department of the Environment (PSA)
5、Department of the Environment (Building Research Establishment) Greater London Council Mastic Asphalt Council and Employers Federation North Wales Slate Quarries Association Royal Institute of British Architects Royal Institution of Chartered Surveyors Society of Chemical Industry The following bodi
6、es were also represented in the drafting of the standard, through subcommittees and panels: British Ceramic Research Association Coopted members Amendments issued since publication Amd. No. Date of issue CommentsBS6398:1983 BSI 04-1999 i Contents Page Committees responsible Inside front cover Forewo
7、rd ii 1 Scope 1 2 Definitions 1 3 Classification 1 4 Base materials 1 5 Bituminous materials and fillers 1 6 Assembly of damp-proof course 1 7 Marking and packaging 1 Appendix A Test methods 3 Appendix B Recommended uses for bitumen damp-proof courses 3 Appendix C Recommendations for high bond stren
8、gth bitumen damp-proof courses 4 Table 1 Classification and composition of bitumen damp-proof courses 2 Table 2 Recommended uses for bitumen damp-proof courses 4 Publications referred to Inside back coverBS6398:1983 ii BSI 04-1999 Foreword This British Standard has been prepared under the direction
9、of the Elements and Components (of Diverse Materials) for Buildings Standards Committee. This standard supersedes the requirements of clause4 of BS743:1970 as amended in March1978. The intention is to cover the different damp-proof course materials in BS743 by publishing new British Standards or ame
10、nding existing British Standards, after which BS743 will be withdrawn. Research is in progress to develop test methods as a basis for a future performance based specification for damp-proof courses (d.p.c.s). (See DD86.) Until suitable performance criteria have been evolved it will not be possible t
11、o include high bond materials in standards for d.p.c.s. However, provisional recommendations are given in Appendix C. For guidance on use of bitumen d.p.c.s see Appendix B. Further information is given in BS5628-1 and CP121-1. Certification. Attention is drawn to the certification facilities describ
12、ed on the inside back cover of this standard. 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. Compliance with a British Standard does not of itself confer immunity from legal obligati
13、ons. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to4, 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 theins
14、ide front cover.BS6398:1983 BSI 04-1999 1 1 Scope This British Standard specifies requirements for materials and assembly of bitumen damp-proof courses (d.p.c.s) and gives a classification of suchd.p.c.s according to the type(s) of base material they contain. (See Table 1.) The d.p.c.s covered by th
15、is standard are intended for use in masonry constructions. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this standard the definitions given in BS3589 apply together with the following. nominal mass per unit are
16、a a numerical designation of the mass per unit area of a material which is a convenient round number approximately equal to the actual mass per unit area expressed in kg/m 2 3 Classification Bitumen damp-proof courses shall be classified as given in columns1 and2 of Table 1. 4 Base materials 4.1 Min
17、imum mass. When measured as described inA.3 the mass per unit area of the base material shall be not less than the value for the appropriate class of d.p.c. given in column4 of Table 1. 4.2 Hessian. The hessian base shall consist of a single layer of plain woven jute cloth. 4.3 Fibre. The fibre base
18、 shall consist of one or more absorbent sheets of felt made from a mixture of animal and vegetable fibres. The base for class B d.p.c.s shall be made of one sheet whilst the base for class E d.p.c.s shall be made of one or two sheets. 4.4 Asbestos. The asbestos base shall consist of an absorbent she
19、et containing not less than80% asbestos. The percentage of asbestos shall be determined by weighing the residue after ignition of the asbestos base at450C for2h. 4.5 Lead. The lead sheeting shall be a continuous sheet or consist of sheets of lead joined together with soldered joints and shall extend
20、 the full width and length of the finished d.p.c. 5 Bituminous materials and fillers 5.1 Minimum mass. When measured as described inA.2 the mass per unit area of bitumen shall be not less than the value for the appropriate class of d.p.c. given in column5 of Table 1. 5.2 Saturating material. The sat
21、urating material shall consist of bitumen having a penetration within the range 60 to230 inclusive at25C when tested as described in BS4691. 5.3 Coating material 5.3.1 General 5.3.1.1 The coating material shall consist of oxidized bitumen stabilized by mineral filler (see5.3.2) and finished with a s
22、urfacing material (see5.3.3). The mass per unit area of mineral filler and surfacing material shall be within the range given for the appropriate class in column6 of Table 1. 5.3.1.2 When measured as described in BS4692 the softening point of the oxidized bitumen before adding the filler and surfaci
23、ng material shall be within the range 80C to120C. 5.3.1.3 When measured as described in BS4692 the softening point of the finished coating material shall not exceed the softening point of the oxidized bitumen by more than20C. 5.3.2 Mineral filler. The filler shall consist of mineral granules or othe
24、r mineral matter. Not less than99% by mass of filler shall pass a4254m mesh sieve complying with BS410 and not less than50% by mass shall pass a 2124m mesh sieve complying with BS410. 5.3.3 Surfacing material. The surfacing material shall consist of natural sand, mineral granules or other material w
25、hich will prevent adhesion between layers of the finished d.p.c. material in the roll. 6 Assembly of damp-proof course The base shall be impregnated completely with saturating material. Any surplus saturant shall be removed, after which the coating material shall be applied. When a lead sheet is inc
26、luded, this shall be laminated with the base and the two sheets shall be covered on both sides with coating material. When measured as described inA.1 the minimum mass per unit area of the assembled d.p.c. material shall be not less than the value for the appropriate class given in column7 of Table
27、1. 7 Marking and packaging The finished d.p.c. shall be packed in rolls, each roll containing not less than8m in length. Each roll shall be labelled legibly with the number of this British Standard i.e.BS6398:1983 *together with the appropriate classification, i.e.A to F.BS6398:1983 2 BSI 04-1999 Ta
28、ble 1 Classification and composition of bitumen damp-proof courses 1 2 3 4 5 6 7 Class Description Nominal mass per unit area of base Mass per unit area of base Mass per unit area of bituminous material (see note1) Mass per unit area of filler and surfacing material (seenote1) Mass per unit area of
29、assembled d.p.c. material kg/m 2 kg/m 2 kg/m 2 kg/m 2 kg/m 2 min. min. min. max. min. A Hessian base 0.2 0.15 1.7+x 1.1+y 1.9+x 3.8 B Fibre base 0.4 0.34 1.6+x 0.9+y 1.5+x 3.3 C Asbestos base 0.6 0.53 1.7+x 1.0+y 1.8+x 3.8 D Hessian base laminated with lead 0.2 1.2 0.15 1.12 1.5+x 1.0+y 1.7+x 4.4 E
30、Fibre base laminated with lead 0.4 (seenote2) 0.34 1.5+x 0.8+y 1.4+x 4.4 1.2 1.12 F Asbestos base laminated with lead 0.6 1.2 0.53 1.12 1.6+x 0.9+y 1.6+x 4.9 NOTE 1x is equal to0.5 times the excess mass of d.p.c. material, y is equal to0.3 times the excess mass of d.p.c. material. The excess mass of
31、 d.p.c. material is equal to the mass per unit area measured as described inA.1 less the minimum mass per unit area given in column7. NOTE 2The base for class E may consist of two sheets of nominal mass per unit area0.20.BS6398:1983 BSI 04-1999 3 Appendix A Test methods A.1 Determination of mass per
32、 unit area of assembled d.p.c. material. Cut a length of d.p.c. material of area approximately0.80m2 from a roll. Using a steel rule measure the sample to the nearest2mm in width and the nearest6mm in length. Weigh the sample to the nearest gram. Determine the mass per unit area in kg/m 2to the near
33、est0.01kg/m 2 . A.2 Determination of soluble bitumen and mineral filler content A.2.1 Cut two test pieces of area not less than0.01m 2from the sample used inA.1. Measure the area of each test piece. Weigh each test piece to the nearest0.01g. Proceed as described inA.2.2 toA.2.4 for each test piece.
34、A.2.2 Immerse the test piece in200mL trichloroethylene 1) , complying with either types1 or2 as specified in BS580, in a beaker and warm the beaker in a water bath. When the bitumen has dissolved, decant the solution through a tared fluted filter paper into a500mL measuring cylinder. Wash any filler
35、 and base remaining in the beaker to remove traces of bitumen. Wash the filter paper with warm solvent until clean. A.2.3 Make up the solution in the cylinder to500mL, stopper and shake well. Transfer two20mL portions of solution by pipette into tared flat bottomed flasks. Evaporate the solvent usin
36、g either of the methods described in8.3 and8.4 of BS5284:1976. Weigh the recovered bitumen to the nearest0.01g. Determine the mass per unit area inkg/m 2to the nearest 0.01 kg/m 2 . A.2.4 Transfer all the filler and base in the beaker to the tared filter paper used inA.2.2. Remove pieces of base and
37、 lead and wash free of filler. Dry the filter paper and contents for30min at105C to 110C in a laboratory oven complying with BS2648. Cool in a desiccator and weigh. Determine the mass per unit area in kg/m 2to the nearest0.01 kg/m 2 . NOTEThe mass recorded will include any surfacing material which c
38、annot be separated. A.3 Determination of mass per unit area of base material. Roll or fold a sample of material of area not less than0.8m 2 , as necessary, and place in the gauze container of a hot extractor. Extract with trichloroethylene 1) , complying with either types1 or2 as specified in BS580,
39、 for8h. Remove the base material (including any lead) and shake vigorously on a1504m mesh sieve complying with BS410 until no more dust is present. Dry for30min at105C to 110C in the laboratory oven (seeA.2.4). Cool in a desiccator and weigh. Separate any lead from the material. Weigh base material
40、and lead and determine the mass per unit area of each inkg/m 2to the nearest0.01kg/m 2 . Appendix B Recommended uses for bitumen damp-proof courses Table 2 gives guidance on use of bitumen damp-proof courses. 1) For guidance on the safe use of trichloroethylene see Health and Safety Executive Guidan
41、ce Note EH5, “Trichloroethylene:Health and Safety precautions”.BS6398:1983 4 BSI 04-1999 Table 2 Recommended uses for bitumen damp-proof courses Appendix C Recommendations for high bond strength bitumen damp-proof courses Pending further research, provisional recommendations for high-bond strength b
42、itumen damp-proof courses are as follows: a) Minimum mass per unit area of asbestos base=0.34kg/m 2 Minimum mass per unit area of bituminous material=(0.56+x) kg/m 2 Minimum mass per unit area of filler and surfacing=(1.0+y) kg/m 2 where b) Minimum flexural bond strength=1.2N/mm 2when measured using
43、 the method described in clause2 of DD86-1:1983. Minimum short term shear strength=0.75N/mm 2when measured using the method described in clause3 ofDD86-1:1983. Condition within masonry Recommendation Remarks 1. High compressive stress Not suitable Compressive stress in excess of2.50N/mm 2 , e.g.buil
44、dings higher than ten storeys 2. Medium compressive stress Not suitable Compressive stress in the range0.50N/mm 2to2.50N/mm 2 , e.g.four to ten-storey buildings 3. Low compressive stress All classes suitable Compressive stress in the range0.10N/mm 2to0.50N/mm 2 , e.g.buildings of up to four storeys
45、4. Minimal compressive stress with lateral load All classes suitable Compressive stress less than0.10N/mm 2 , e.g.copings, parapet walls 5. Water movement upwards All classes suitable Upward movement of water is normally prevented just above ground level 6. Water movement downwards All classes suita
46、ble Downward movement of water needs to be prevented at many levels, e.g.parapets, chimneys and above lintels in cavity walls 7. Water movement horizontally All classes suitable Horizontal movement of water needs to be prevented where the outer leaf of a cavity wall is returned to close the cavity o
47、r where d.p.c.s in walls and d.p.c.s in abutting floors are at different levels 8. High shear stress Only high bond strength d.p.c.s should be used (see Appendix C) High shear stress occurs in retaining walls,etc. 9. High flexural stress Only high bond strength d.p.c.s should be used (see Appendix C
48、) High flexural stress occurs in free standing walls, parapets, etc. NOTEClass A d.p.c.s are also suitable for tanking basements (see CP102). x is equal to0.5 times the excess mass of d.p.c. material (see Table 1) y is equal to0.3 times the excess mass of d.p.c. material (see Table 1)BS6398:1983 BSI
49、 04-1999 Publications referred to BS410, Specification for test sieves. BS580, Trichloroethylene. BS743, Materials for damp-proof courses. Metric units 2) . BS2648, Performance requirements for electrically-heated laboratory drying ovens. BS3589, Glossary of general building terms. BS4691, Method for determination of penetration of bituminous materials. BS4692, Method for determination of softening point of bitumen (ring and ball). BS5284, Sampling and testing mastic asphalt and pitchmastic used in building. BS5628, Code of practice for the structural use of ma
