BS 5803-5-1985 Thermal insulation for use in pitched roof spaces in dwellings - Specification for installation of man-made mineral fibre and cellulose fibre insulation《坡屋顶空间隔热 第5部分.pdf

1、BRITISH STANDARD BS 5803-5: 1985 Incorporating Amendment No. 1 Thermal insulation for use in pitched roof spaces in dwellings Part 5: Specification for installation of man-made mineral fibre and cellulose fibre insulation UDC 699.86:692.42:677.46 + 677.52BS5803-5:1985 This British Standard, having b

2、een prepared under the directionof the Elements andComponents (of Diverse Materials) for Buildings Standards Committee, waspublished under the authorityofthe Board of BSIandcomes intoeffect on 28February 1985 BSI 07-1999 The following BSI references relate to the work on this standard: Committee ref

3、erence ECB/38 Draft for comment 83/10121 DC ISBN 0 580 14246 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Elements andComponents (of Diverse Materials) for Buildings Standards Committee (ECB/-) to Technical Committee ECB/38 upon whi

4、ch the following bodies were represented: Chartered Institution of Building Services Consumer Standards Advisory Committee of BSI Department of the Environment (Building Research Establishment, Fire Research Station) Department of the Environment (Housing and Construction Industries) Department of t

5、he Environment (Property Services Agency) Eurisol (UK) (Association of Manufacturers of Mineral Fibre Insulation) Greater London Council Independent Waste Paper Processors Association Institution of Building Control Officers National Association of Loft Insulation Contractors National Council of Bui

6、lding Materials Producers Royal Institute of British Architects Thermal Insulation Manufacturers Association Amendments issued since publication Amd. No. Date of issue Comments 8040 February1994 Indicated by a sideline in the marginBS5803-5:1985 BSI 07-1999 i Contents Page Committees responsible Ins

7、ide front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Insulation materials 1 4 Condition of roof space 1 5 Assessment of work required in roof space 2 6 Application of insulation material 2 7 Application of additional insulation 7 8 Assessment of roof spaces after completion of work 10 9 Maintenan

8、ce 10 10 Certification 10 Appendix A Thermal insulation at rafter level 16 Appendix B Ventilation of roof space 16 Appendix C Avoidance of overheating of electric cables 18 Figure 1 Laying mat insulation with eaves ventilation baffle 3 Figure 2 Insulation with eaves ventilation 4 Figure 3 Soffit-les

9、s eaves: method of ventilating existing mat insulation 6 Figure 4 Insulation with eaves ventilation, cavity closure, insulation over joists 8 Figure 5 Blown fibre insulation with eaves ventilation and cavity closure 9 Figure 6 Insulation of elevated cold water tank 11 Figure 7 Insulation of cold wat

10、er tank on joists (mat material) 12 Figure 8 Insulation of cold water tank using sheet material 13 Figure 9 Insulation of loft hatch 14 Figure 10 Typical insulation of water pipes 15 Publications referred to Inside back coverBS5803-5:1985 ii BSI 07-1999 Foreword This Part of BS 5803 has been prepare

11、d under the direction of the Elements and Components (of Diverse Materials) for Building Standards Committee. The thermal transmittance of a ceiling to the roof space of a dwelling is reduced by the application of thermal insulation materials, either between or over the ceiling joists. This Part cov

12、ers the assessments of the roof and the methods of installing the insulation material. It covers the following situations: a) where the contract is for the insulation of a single dwelling; b) where the contract is for a number of dwellings. BS5803 comprises the following Parts: Part1: Specification

13、for man-made mineral fibre thermal insulation mats; Part2: Specification for man-made mineral fibre thermal insulation in pelleted or granular form for application by blowing; Part3: Specification for cellulose fibre thermal insulation for application by blowing; Part4: Methods for determining flamm

14、ability and resistance to smouldering; Part5: Specification for installation of man-made mineral fibre and cellulose fibre insulation. NOTEThis Part has been written in the form of a specification (see clause 6 of PD6501-1:1982). To comply with this specification, the user has to comply with all its

15、 requirements. He may depart from recommendations, but this would be on his own responsibility and he would be expected to have good reasons for doing so. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their c

16、orrect 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 and ii, pages1 to18, an inside back cover and a back cover. This standard has been updated (see cop

17、yright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5803-5:1985 BSI 07-1999 1 1 Scope This Part of BS5803 specifies requirements for the application of thermal insulation in pitched roof spaces in new and existing dwellings

18、. It covers both the insulation of an uninsulated roof and the application of additional insulation to increase the existing standard of insulation. Insulation at rafter level is not included but advice on this type of installation is given inAppendix A. The standard specifies essential procedures a

19、nd precautions to be undertaken, and makes recommendations to ensure an adequate installation. It covers fibrous materials that may be substantially inorganic or organic and may be in the form of mats or loose-fill suitable for application by blowing. It covers the following situations: a) an indivi

20、dual dwelling where the work is carried out by an insulation installer; b) a number of dwellings where the work is carried out by an insulation installer; c) an individual dwelling where the work is carried out without a contract. NOTEIn all cases the clauses covering workmanship apply. NOTEThe titl

21、es of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Part of BS5803 the definitions given in BS3533 and BS3589 apply together with the following. 2.1 mat a length of flexible man-made mineral fibre insulating material normall

22、y supplied as a roll or batt 2.2 batt mat in the form of rectangular pieces generally between1m and 2m in length, supplied packed flat or folded 2.3 loose-fill products in loose, granulated or pelleted form 2.4 blowing moving into position by a mechanically induced air current 2.5 cellulose fibre a

23、loose-fill insulation composed of cellulose (wood-based) fibre treated with fire retardant agents and biocidal additives 2.6 man-made mineral fibre a generic term for all man-made non-metallic inorganic fibres 2.7 insulation installer installer of thermal insulation material 2.8 R value thermal resi

24、stance (in m 2 K/W) assessed at the appropriate thickness NOTESee BS5803-1, BS5803-2 andBS5803-3. 3 Insulation materials The insulation material shall consist of one of the following: a) man-made mineral fibre mats complying with BS5803-1; b) man-made mineral fibre in pelleted or granular form compl

25、ying with BS5803-2; c) cellulose fibre complying with BS5803-3. 4 Condition of roof space To ensure that the insulation of the roof space will be satisfactory the roof space shall be adequately ventilated to prevent condensation and be in a satisfactory state of repair. COMMENTARY AND RECOMMENDATION

26、S ON CLAUSE 4. The following recommendations should be followed. a) Ventilation. Ventilation of the roof space should be as agreed in Appendix B. b) State of repair. There should be no obvious rainwater penetration or evidence of such penetration, nor evidence of wet or dry rot in the roof space. c)

27、 Loading of ceiling. The ceiling should be capable of supporting the weight of the insulation and loads imposed during installation. d) Electrical wiring. There should be no obvious defects in the electrical wiring. General guidance on the avoidance of overheating of electric cables is given in Appe

28、ndix C. e) Metal corrosion. There should be no obvious corrosion to the structural metal connections in the roof members.BS5803-5:1985 2 BSI 07-1999 5 Assessment of work required in roof space The client and the insulation installer shall establish the basis for the contract before starting work. NO

29、TEAttention is drawn to the requirements of the Unfair Contract Terms Act1977 and the general common law duty of care to avoid injury to persons or property by negligent act or omission so far as is reasonably practicable. COMMENTARY AND RECOMMENDATIONS ON CLAUSE 5. The following items should be amo

30、ng those established. a) Any requirements necessary to ensure that the conditions in clause 4 are met. b) Areas to be insulated. c)Type of insulation to be provided. d) R value of the material to be installed, or the different values over the areas concerned where applicable. e) That for the purpose

31、 of installation there is adequate access to the roof space and adequate lighting. Where temporary access is to be formed, the details and method of reinstatement should be agreed. f) The need to reposition or remove objects stored in the roof space to allow the full ceiling area to be insulated. g)

32、 Storage and expansion tanks that require insulating and those that require lids to be fitted see 6.5 and item b) of clause 8. h) Water pipes that will be above the insulation and that require insulating separately seeitemc) of 8. 6 Application of insulation material 6.1 Hygiene When installing insu

33、lation, suitable precautions shall be taken in regard to hygiene. COMMENTARY AND RECOMMENDATIONS ON 6.1. When applying any form of insulation particularly in confined areas, dust may be generated. To prevent inhalation of the dust a suitable dust mask should be worn. Man-made fibres can cause skin,

34、eye and throat irritation and should be handled with care. Some protection can be provided by the wearing of suitable protective clothing. When washing contaminated skin, it should first be rinsed under cold running water before the application of soap which, if applied too soon, may rub fibres into

35、 the skin. Packages should only be opened in the loft (except where the material is a blown fibre) and should be unrolled gently. Blown fibre should be poured gently so that loose fibres are not blown about. Precautions should be taken to ensure the insulation material does not lead to contamination

36、 of the water tank. 6.2 General Before starting work, all holes at ceiling drops for pipes and other services shall be sealed. Where heating systems or appliances have inlets within the loft space for air for combustion or heating, before commencing work in the loft space the heating system or appli

37、ance shall be turned off and appropriate action taken to ensure that it cannot be inadvertently turned on again until the work is complete. With the appliance off the air inlets in the loft shall be sealed. The seal shall be removed and the appliance turned on only when the work is complete. 6.3 Mat

38、s 6.3.1 Materials. There are no requirements for materials. COMMENTARY AND RECOMMENDATIONS ON 6.3.1. Preferably the mat should be of such a width that it can be laid between the joists. Wide rolls are also available and these may be cut to fit joist widths or laid over the joists as a blanket. Gener

39、ally the mat is compression packed and it should be unpacked within the roof space. 6.3.2 Application between joists. Application between joists shall be carried out as follows. a) When insulating between joists take the mat (roll or batt) to one end of the roof space and unroll it or lay it. With t

40、he free end at the wall plate lay the mat between the joists, working towards the middle of the roof space. In the case of roofs with a small angle of pitch push the mat into position at the wallplate by use of a suitable implement. Ensure that the end of the mat is not inserted into the eaves so fa

41、r as to obstruct ventilation or alternatively provide a suitable stop or alternative ventilation (see Figure 1, Figure 2 and Figure 3). b) When the mat has been laid to the middle of the roof space cut the material. Take the remainder to the wallplate of the next uninsulated section and repeat the p

42、rocess. Continue this practice until the whole of one side of the roof space is completed. Repeat the procedure on the other side of the roof space. Butt joint the material where the lengths join. c) Where there are binders running immediately above and at right angles to the main joists, cut the ma

43、t where the two intersect. Push the mat below the binder and butt join.BS5803-5:1985 BSI 07-1999 3 d) Insulate areas within the roof space that are not the same width as the normal joint space by cutting strips of the correct width from the roll. Tailor these strips neatly into the space to be insul

44、ated. COMMENTARY AND RECOMMENDATIONS ON 6.3.2. Application between joists is the preferred method and has the advantage that the position of joists can be located so lessening the risk of accidental ceiling damage and removing the need to cut round vertical supports. Figure 1 Laying mat insulation w

45、ith eaves ventilation baffleBS5803-5:1985 4 BSI 07-1999 Figure 2 Insulation with eaves ventilationBS5803-5:1985 BSI 07-1999 5Figure 2 Insulation with eaves ventilation (concluded)BS5803-5:1985 6 BSI 07-1999 6.3.3 Application over joists. Insulating over the joists shall be carried out as follows. a)

46、 Take the roll to the edge of the ceiling and unroll over the joists parallel to the eaves. b) At eaves, cut the insulation to fit around joist ends and tuck it down to the wall plate to avoid draughts below the insulation (see Figure 4) and to facilitate ventilation at eaves. c) Repeat a) and b) un

47、til the full length of the roof space to eaves is completely insulated. d) Repeat a), b) and c) on the opposite side of the roof space. e) Complete the insulation of the entire roof space, ensuring close butted joints between insulation sections. f) The insulation will drape slightly between joists

48、and care shall be taken to avoid stepping on to the ceiling as the edges of the joists will not be visible once the insulation is laid. COMMENTARY AND RECOMMENDATIONS ON 6.3.3. Theinsulation is normally laid at right angles to the ceiling joists. 6.4 Blown fibrous materials 6.4.1 System. The system

49、shall comprise loose-fill material capable of being installed in the roof space by blowing, and a machine capable of installing the material at the specified thickness and density. The machine shall be capable of being operated with safety from the domestic power supply, or the installation contractor shall provide the source of power. Figure 3 Soffit-less eaves: method of ventilating existing mat insulationBS5803-5:1985 BSI 07-1999 7 6.4.2 Application. The application of blown fibrous materials shall be carried out as follow