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1、BS 8481:2006 Design, preparation and application of internal gypsum, cement, cement and lime plastering systems Specification ICS 91.180 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Licensed Copy: London South Bank University, London South Bank University,
2、Fri Dec 08 06:11:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2006 ISBN 0 580 49184 6 The following BSI references relate to the work on this standard: Committee
3、 reference B/544 Draft for comment 06/30140171 DC Publication history First published, September 2006 Amendments issued since publication Amd. no.DateText affected BS 8481:2006 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:11:49 GMT+00:00 2006, Uncontrolled
4、 Copy, (c) BSI BSI 2006i BS 8481:2006 Contents Foreword iii 1Scope 1 2Normative references 1 3Terms and definitions 2 4Materials and accessories 4 5Design factors influencing the selection of gypsum plastering systems 7 6Characteristics of gypsum plastering systems 8 7Design factors influencing the
5、selection of cement, cement and lime plastering systems 13 8Characteristics of cement, cement and lime plastering systems 13 9Backgrounds, including preparation for cement, cement and lime plastering systems 17 10Preparation and application of cement, cement and lime plasters 21 11Maintenance and re
6、pair (other than restoration of old and historic buildings) 23 Annexes Annex A (normative) Fixing applied backgrounds 25 Annex B (informative) Restoration of plasters on old and historic buildings 28 Bibliography 31 List of figures Figure A.1 Typical applications of metal beads and temporary formwor
7、k around openings 27 List of tables Table 1 Thermal conductivity values of gypsum plaster according to density 10 Table 2 Nominal and minimum thickness of undercoat(s) of a multi-coat system or one-coat system 11 Table 3 Recommended thicknesses for various types of one-coat cement, cement and lime p
8、lasters to solid backgrounds 16 Table 4 Recommended total thicknesses for multi-coat systems consisting of cement, and cement and lime plasters onto solid walls and soffits (the underside of floor slabs) 16 Table 5 Recommended pre-treatments for various cement, cement and lime plastering systems and
9、 for various backgrounds 19 Table 6 Mixes suitable for plastering 21 Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 31 and a back cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:11:49 GMT+00:00
10、2006, Uncontrolled Copy, (c) BSI BS 8481:2006 ii BSI 2006This page deliberately left blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:11:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 2006iii BS 8481:2006 Foreword Publishing information This British S
11、tandard was published by BSI and came into effect on 29 September 2006. It was prepared by Technical Committee B/544, Plastering, rendering, dry lining. A list of organizations represented on this committee can be obtained on request to its secretary. Supersession This British Standard together with
12、 BS EN 13914-2 and PD CEN/TR 15123 supersedes BS 5492:1990, which is withdrawn. Relationship with other publications BS 8481 is largely based on an amalgamation of two CEN Technical Reports: CEN/TR 15124:2005, Design, preparation and application of internal gypsum plastering systems. CEN/TR 15125:20
13、05, Design, preparation and application of internal cement and/or lime plastering systems. However certain additions and deletions have been made to these texts to make them appropriate to working conditions found in the UK. Information about this document Where the guidance for the use of gypsum pl
14、astering systems differ from that for plastering systems based on cement, cement and lime, the guidance for the former precedes that for the latter. It is essential that the design clauses are read in conjunction with the clauses on background and preparation. It is not the function of this standard
15、 to assign responsibility for the design and application of any work or actions mentioned within to any specific party. Such responsibility is a matter for other documentation associated with the work, e.g. the contract. A CEN Technical Report is also available which gives the equivalent information
16、 for internal polymer plastering systems: CEN/TR 15123:2005, Design, preparation and application of internal polymer plastering systems. It has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experienced p
17、eople, for whose use it has been produced. Presentational conventions The provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”. Commentary, explanation and general informative material is
18、presented in smaller italic type, and does not constitute a normative element. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:11:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8481:2006 iv BSI 2006 Contractual and legal considerations This publication does
19、 not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:11:49 GMT+
20、00:00 2006, Uncontrolled Copy, (c) BSI BSI 20061 BS 8481:2006 1 Scope This British Standard specifies the design, preparation and application of plaster based on gypsum, cement, cement and lime, for internal plastering on all types of background used under normal conditions. It includes plastering o
21、nto both new and old backgrounds and the maintenance and repair of existing work. It concerns materials, backgrounds, preparation of the surface to be plastered, choice of suitable gypsum, cement, cement and lime plastering systems, methods of application and inspection and testing of plastering. Re
22、commendations on gypsum, cement, cement and lime plastering mixes with special properties intended to enhance thermal insulation, fire resistance, acoustic insulation and to increase radiation absorption maintenance and repair are also covered. NOTE Relevant data are summarized in a series of tables
23、. This standard should be read in conjunction with BS EN 13914-2 especially regarding surface, requirements, flatness, verticality, angularity, types of finish and smoothness which are not dealt with in this standard. 2 Normative references The following referenced documents are indispensable for th
24、e application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS 4027, Specification for sulfate-resisting Portland cement BS EN 197-1, Cement Part 1: Composition, specif
25、ications and conformity criteria for common cements BS EN 413-1, Masonry cement Part 1: Composition, specifications and conformity criteria BS EN 459-1, Building lime Part 1: Definitions, specifications and conformity criteria BS EN 934-3, Admixtures for concrete, mortar and grout Part 3: Admixtures
26、 for masonry mortar Definitions, requirements, conformity, marking and labelling BS EN 998-1:2003, Specification for mortar for masonry Part 1: Rendering and plastering mortar BS EN 10223-3, Steel wire and wire products for fences Part 3: Hexagonal steel wire netting for engineering purposes BS EN 1
27、0230-1, Steel wire nails Part 1: Loose nails for general applications BS EN 10244-1, Steel wire and wire products Non-ferrous metallic coatings on steel wire Part 1: General principles BS EN 10244-2, Steel wire and wire products Non-ferrous metallic coatings on steel wire Part 2: Zinc or zinc alloy
28、coatings BS EN 12878, Pigments for the colouring of building materials based on cement and/or lime Specifications and methods of test Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:11:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8481:2006 2 BSI 2006 BS E
29、N 13055-1, Lightweight aggregates Part 1: Lightweight aggregates for concrete, mortar and grout BS EN 13139, Aggregates for mortar BS EN 13279-1:2005, Gypsum binders and gypsum plasters Part 1: Definitions and requirements BS EN 13496, Thermal insulation products for building applications Determinat
30、ion of the mechanical properties of glass fibre meshes BS EN 13658-1, Metal lath and beads Definitions, requirements and test methods Part 1: Internal plastering BS EN 13658-2, Metal lath and beads Definitions, requirements and test methods Part 2: External rendering BS EN 13914-2:2005, Design, prep
31、aration and application of external rendering and internal plastering Part 2: Design considerations and essential principles for internal plastering 3 Terms and definitions For the purposes of this British Standard, the terms and definitions given in BS EN 13914-2 and the following apply. 3.1Plaster
32、 definitions 3.1.1plaster mixture based on one or more binders, applied while plastic and hardens after application, used to obtain an internal surface finish NOTE Plaster does not acquire its final characteristics until it has set on the building component. 3.1.2gypsum plaster plaster consisting of
33、 at least 50% gypsum binder as the principle active binding component NOTE Additives and aggregates might be added by the manufacturer. 3.1.3designed mixes plaster designed and manufactured to fulfil stated properties and subjected test requirements (performance concept) 3.1.4prescribed mixes plaste
34、r made in predetermined proportions the properties of which are assumed from the stated proportions of the constituents (recipe concept) 3.2Application definitions 3.2.1plastering application of plaster 3.2.2plaster coat obtained by application of one or more layers with one or more mixes of the sam
35、e product Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:11:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 20063 BS 8481:2006 3.2.3plastering system plaster coat or sequence of plaster coats applied to a background, including the possible use of a support
36、 and/or reinforcement and/or pre-treatment 3.2.4one-coat plaster plaster applied in one-coat which fulfils all the functions of a plastering system 3.2.5multi-coat plaster plaster system using a sequence of plaster coats to achieve the required thickness when all operations are completed after the p
37、laster has set but not dry 3.2.6undercoat lower plaster coat or plaster coats of a plastering system 3.2.7final coat last plaster coat of a multi-coat plastering system 3.2.8dubbing out process of filling large localized irregularities in the background, such as hollows, prior to the application of
38、an undercoat 3.3Background definitions 3.3.1background surface of a construction element to which a plastering system is to be applied 3.3.2key roughness of a surface which enables plaster to make a bond 3.3.3support product attached to the background to which a plaster is applied so that the plaste
39、ring system is largely independent of the background (e.g. lathing) 3.3.4reinforcement material incorporated within a plaster coat to improve resistance to cracking (e.g. mesh) 3.3.5bonding agent proprietary material used to provide adhesion of the plastering system to the background where necessary
40、 3.3.6spatterdash and stipple pre-treatments to prepare a background for plastering NOTE Stipple is only used in the form of site plaster. 3.4Other definitions 3.4.1efflorescence formation of crystals on a surface during drying caused by the presence of soluble salts Licensed Copy: London South Bank
41、 University, London South Bank University, Fri Dec 08 06:11:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8481:2006 4 BSI 2006 3.4.2crazing network of short, irregular and very fine surface cracks up to approximately 0.2 mm in width NOTE Hairline cracks do not impair the function of the plaster a
42、nd are therefore acceptable to a limited extent. 4 Materials and accessories 4.1Materials for site-made plasters 4.1.1Binders 4.1.1.1Gypsum binders and gypsum plasters If specified, only gypsum binders and gypsum plaster conforming to BS EN 13279-1 shall be used. 4.1.1.2Common cements including colo
43、ured cement Where used, common cements, including coloured and pigmented cements, shall conform to the requirements of BS EN 197-1. NOTE Not all types and classes of cement are suitable for each and every application. 4.1.1.3Masonry cement Where used, masonry cement shall conform to the requirements
44、 of BS EN 413-1. 4.1.1.4Sulfate resistant cements If specified, sulfate resistant cements conforming to BS 4027 shall be used. 4.1.1.5Building lime Where used, building lime shall conform to the requirements of BS EN 459-1. 4.1.2Aggregates Where used, aggregates with established suitability for use
45、plasters shall be used. Aggregates shall conform to BS EN 13139 for dense aggregates or BS EN 13055-1 for light aggregates as appropriate. 4.1.3Admixtures for cement and/or lime based plasters Where appropriate, admixtures with established suitability for plasters shall be used. Admixtures conformin
46、g to the requirements of BS EN 934-3 shall be used; however, admixtures falling outside the scope of BS EN 934-3 can be used given established usage and shall be applied in accordance with manufacturers instructions. Licensed Copy: London South Bank University, London South Bank University, Fri Dec
47、08 06:11:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 20065 BS 8481:2006 4.1.4Additions 4.1.4.1Bonding agents Bonding agents suitable for the individual application shall be used. The manufacturers instructions shall be followed. 4.1.4.2Pigments Pigments conforming to BS EN 12878 shall be used
48、however; pigments falling outside the scope of BS EN 12878 can be used given established usage and shall be applied in accordance with manufacturers instructions. For both the manufacturers instructions shall be followed. 4.1.4.3Fibres COMMENTARY ON 4.1.4.3 Fibres can be used in specialized applicat
49、ions such as restoration work, sprayed plasterings and plasterings on lathing or insulation board. Only fibres which do not affect the chemical or physical stability of the plaster shall be used. NOTE Fibres should be compatible with the binder. 4.2Water The water shall be of a quality such that it does not adversely affect the plaster. NOTE 1 Water fit for drinking is suitable for mixes for plastering. NOTE 2 Attention is drawn to the requirements of BS EN 1008 in cases