1、BRITISH STANDARD BS 5502-21: 1990 Incorporating Amendments Nos. 1 and 2 Buildings and structures for agriculture Part 21: Code of practice for selection and use of construction materials ICS 65.040.01 BS 5502-21:1990 This British Standard, having been prepared under the direction of the Farm and Hor
2、ticultural Buildings Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 December 1990 BSI 10 June 2003 First published, as BS 5502-1.1 and BS 5502-3.2, 1986 Second edition, as BS 5502-21, December 1990 The following BSI reference relates to
3、the work on this British Standard: Committee reference B/549 ISBN 0 580 18348 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee B/549, Agricultural buildings and structures, upon which the following bodies were represente
4、d: British Commercial Glasshouse Manufacturers Association British Precast Concrete Federation Ltd. British Veterinary Association Cold Rolled Sections Association DEFRA Environment Agency Fibre Cement Manufacturers Association Ltd. Galvanizers Association Health and Safety Executive Institution of
5、Structural Engineers Northern Ireland Department of Agriculture and Rural Development Royal Institute of British Architects Royal Institution of Chartered Surveyors Rural Design and Building Association Scottish Executive Environment and Rural Affairs Department Silsoe Research Institute Steel Const
6、ruction Institute Water UK Amendments issued since publication Amd. No. Date Comments 7676 15 June 1993 See national foreword 13577 10 June 2003 See national forewordBS 5502-21:1990 BSI 10 June 2003 i Contents P a g e Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Definitions 1
7、 3 Selection of materials 1 4 Timber and plywood 6 5 Fibre building board 7 6 Aluminium 7 7 Steel 9 8 Fibre reinforced cement products 11 9G l a z i n g 1 3 10 Concrete 14 11 Masonry 14 12 Other cladding materials 14 13 Hot rolled asphalt for forage silos 15 Appendix A Checklist of attributes of mat
8、erials 19 Appendix B Durability and preservative treatments for timber 20 Appendix C Recommendations on the selection of concrete mixes 24 Table 1 Corrosive reactions of certain chemicals and wastes in contact with concrete and steel 4 Table 2 End laps for corrugated 76 mm aluminium sheets 8 Table 3
9、 Side laps for corrugated 76 mm aluminium sheets 8 Table 4 End laps for corrugated 76 mm coated steel sheets 10 Table 5 Side laps for corrugated 76 mm coated steel sheets 11 Table 6 End laps for corrugated fibre reinforced cement sheets for full weathertightness 12 Table 7 Side laps for corrugated f
10、ibre reinforced cement sheets of BS EN 494, profile class 1 (75 mm) and class 2 (150 mm) for full weathertightness 12 Table 8 Dimensions for glass 13 Table 9 Timber with heartwood sufficiently durable to be used without treatment 20 Table 10 Preservative treatments for timber 20 Table 11 Preservativ
11、e treatments for timber in contact with the ground, soil or manure and that is likely to become and remain wet 17 Table 12 Preservative treatments for timber subject to intermittent wetting or damp conditions 22 Table 12 Preservative treatments for timber subject to intermittent wetting or damp cond
12、itions (continued)2 3 Table 13 Recommended concrete mixes 25 Table 14 Site-mixed concrete 25 Index 26 Publication(s) referred to 27BS 5502-21:1990 ii BSI 10 June 2003 Foreword This Part of BS 5502 has been prepared under the direction of the Farm and Horticultural Buildings Standards Policy Committe
13、e and comprises a revision of BS 5502-1.1 and BS 5502-3.2, which are withdrawn. The start and finish of text introduced or altered by Amendments Nos. 1 and 2 is indicated in the text by tags !“ for Amendment No.1 and #$ for Amendment No.2. While BS 5502 is being revised and added to, the opportunity
14、 is being taken to restructure the standard into the following broad subject areas: Part 0: Introduction and consolidated index; Parts 10 to 19: Reference information and legislation; Parts 20 to 39: General design; Parts 40 to 59: Livestock buildings; Parts 60 to 79: Crop buildings; Parts 80 to 99:
15、 Ancillary buildings; More specifically, the general design series will comprise: Part 20: Code of practice for general design considerations; Part 21: Code of practice for selection and use of construction materials; Part 22: Code of practice for design, construction and loading; Part 23: Code of p
16、ractice for fire precautions; Part 25: Code of practice for design and installation of services and facilities; Part 30: Code of practice for control of infestation; Part 31: Guide to the storage and handling of waste; Part 32: Guide to noise attenuation; Part 33: Guide to control of odour pollution
17、. A more detailed description of the new structure of BS 5502 is given in Part 0. The object of introducing the new structure is to allow subject areas to be broadly characterized, and related subject matter, whether in the form of recommendations, guidance or supporting data, to be rationalized and
18、 brought together. It will also allow sufficient flexibility to allow the standard to be expanded and developed in a logical way in the future. Parts 20 to 39 relating to general design will follow broadly the existing structure of BS 5502-1.0 to -1.7. It has been assumed in the drafting of this Bri
19、tish Standard that the execution of its provisions is entrusted to appropriately qualified and experienced people, for whose guidance it has been prepared. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Comp
20、liance 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 ii, pages 1 to 29 and a back cover. The BSI copyright notice displayed in this document indicates when the document was
21、last issued.BS 5502-21:1990 BSI 10 June 2003 1 1 Scope This Part of BS 5502 gives recommendations on the selection, performance and use of materials in the construction of agricultural buildings and structures. NOTE The titles of the publications referred to in this standard are listed on page 27. 2
22、 Definitions For the purposes of this standard, the definitions given in BS 6100 apply. NOTE Work has commenced on a further Part of BS 5502-10 which will be a glossary of terms for buildings and structures for agriculture. 3 Selection of materials 3.1 General 3.1.1 Materials used in the constructio
23、n and for the modification of farm buildings should be selected to satisfy the building design classification (see Table 1 and Clause 14 of BS 5502-22:2003). NOTE All buildings should carry a sign giving the date of erection and classification. 3.1.2 The use of any material or any method of mixing o
24、r preparing materials, or of applying or fixing materials should be in accordance with the provisions of the relevant British Standard specification or British Standard code of practice covering the quality of material, installation and workmanship, unless otherwise recommended in this code. The rec
25、ommendations given in this British Standard are not intended to preclude the use, where appropriate, of alternative materials providing that those materials have the required durability and strength, are suited to their intended function, and are applied and fixed in accordance with the requirements
26、 of the relevant British Standard. NOTE 1 Alternative materials include those covered by BBA 1)certificates. NOTE 2 For further information on performance and loading criteria for profiled sheeting see BS 5427. 3.1.3 All materials, surfaces and fittings that under normal operations may be likely to
27、come into contact with persons and/or livestock should be free from projections, sharp edges or perforations that could cause damage or injury. The materials used for internal surfaces should be selected so as to avoid any toxic hazard arising from contact or chewing, and to facilitate cleaning and
28、the maintenance of general hygiene. All surfaces and exposed materials in the vicinity of crops should be free of toxic hazard. 3.1.4 For evaluating new or used materials or fixing methods for which there is no British Standard, the attributes listed in Appendix A should be considered. NOTE In gener
29、al, materials used in the construction of farm buildings should be new, but the use of second-hand materials may he acceptable if they comply with the performance standards required. 3.1.5 Materials used in internal and external services should be in accordance with the recommendations given in BS 5
30、502-25. #3.1.6 Materials for roofs should result in the roof being non-fragile.$ 3.2 Durability of materials 3.2.1 Durability life Durability life may be different from design life. Where required, guidance should be sought on durability life of materials. NOTE This information may normally be obtai
31、ned from the manufacturer or supplier. Unless otherwise stated, the structural components and the external envelope should, with reasonable maintenance, remain efficient for the appropriate design life. 1) British Board of Agrment.BS 5502-21:1990 2 BSI 10 June 2003 3.2.2 Weathering Materials exposed
32、 to the weather should be able, with normal maintenance, to withstand the local climatic conditions for the expected design life of the material concerned. Climatic conditions include wind and snow loadings, variations in temperature and moisture content, the effects of rain, hail and frost, atmosph
33、eric pollution and ultraviolet radiation. 3.2.3 Chemical attack Chemical attack on building materials may result from contact with sprayed or stored chemicals, with farm products, with wastes containing active chemical components, or from electrolytic action between different metals in moist conditi
34、ons. In such circumstances, materials should be selected that are not likely to be affected significantly by the chemicals or they should be painted, coated with a resistant material or otherwise protected. 3.2.4 Biological attack Wood and wood-based materials may be attacked and degraded by fungi a
35、nd insects under certain conditions and rot may develop in timbers used in damp or wet environments (i.e. where the moisture content of the timber remains above 20 % for significant periods). The time taken for the rot to become established and the rate of degradation is dependent upon the inherent
36、durability of the timber concerned and the prevailing conditions. For timbers of a low natural durability a wood preservative should be used where such a hazard is recognized (see 4.2). 3.2.5 Accidental impact When sizing and placing materials, the risk of accidental damage from livestock or rough u
37、sage in farming operations, should be considered. 3.2.6 Strength Materials should be of sufficient inherent strength and should be so sized and be of such configuration as to perform adequately the functions for which they are intended. If any materials are not self-supporting they should be provide
38、d with an adequate supporting framework. The loadings for various aspects of farm building design should be in accordance with BS 5502-22. 3.3 Corrosion effects 3.3.1 General Reference should be made to the relevant British Standard code of practice covering the design of buildings and structures fo
39、r the material for suitable methods of protection from corrosion. NOTE For protection of concrete see also CIRIA TN 310 Protection of reinforced concrete by surface treatments. 3.3.2 Metals in contact with preserved timber Precautions should be taken to avoid contact between uncoated aluminium sheet
40、ing and copper-containing preservative treated timber, such as isolating the area of contact with a suitable tape or bituminous layer. Under some conditions, metal fastenings may become corroded through contact with timber treated with preservatives containing copper and the preservative manufacture
41、r should be consulted about any possible interactions of this kind (see BS 4072-2). Provided the timber remains dry there is little risk of interaction of treated wood with ferrous metal fittings. Where corrosion of steel or galvanized steel may be expected to occur, even with untreated timbers, cor
42、rosion is more severe in the presence of copper-based preservatives. No metal fittings should be applied until the period of fixation of the preservatives is complete. There is very little service evidence on which to base advice on the interaction of preservative-treated wood with other metals. 3.3
43、.3 Metals in contact with cement and concrete Both aluminium and zinc are subject to attack by alkaline solutions and by fresh workable concrete. The attack by concrete is reduced and may cease altogether after it has hardened and while it remains dry. If the concrete becomes damp, the attack may re
44、commence. Where aluminium is used externally in contact with concrete it should be anodized or suitably protected.BS 5502-21:1990 BSI 10 June 2003 3 3.3.4 Metals in contact with one another For any two metals in contact, the metal uppermost in the following list corrodes. The further apart the metal
45、s are in this list, the greater is the corrosion. a) Magnesium b) Zinc, cadmium c) Chromium, aluminium d) Steel, iron e) Stainless steel f) Lead, tin g) Low-copper brass h) Nickel i) Copper, high-copper brass To prevent corrosion, the contact surfaces of both metals should be painted, or that of the
46、 metal lower in the list, never that of the higher metal alone, as in this case there would be extreme current density on a small area should any small holes occur in the paint layer. 3.3.5 Certain chemicals and wastes in contact with steel and concrete The corrosive reactions described in Table 1 s
47、hould be considered when using steel and concrete in the agricultural environment. 3.4 Thermal insulation 3.4.1 General Recommendations on insulation are given in the Parts of BS 5502 for specific types of building. 3.4.2 Insulating materials The thermal insulating properties of a structure, such as
48、 a wall or a roof, depend mainly upon the proportion of still air present between its inner and outer faces. This can be increased either by the introduction of air cavities or by the inclusion of layers of insulating material which themselves contain entrapped air or other gases in the thickness of
49、 the structure. Insulating materials may be structural, such as hollow or lightweight concrete blocks, or no-fines concrete; or non-structural, such as loose fill material, quilts and semi-rigid slabs and boards. Insulating materials used in farm building construction should be selected and installed with regard to possible hazards, including: a) physical damage from impact by stock, vehicles, operatives and their handtools (brooms, shovels, etc
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