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1、BRITISH STANDARD BS 8000-3: 1989 Incorporating Amendment No. 1 Workmanship on building sites Part 3: Code of practice for masonry CAWS F10, F30 UDC 69.002.72:697.81:006.76(083.75) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:34:21 GMT+00:00 2006, Uncontrol
2、led Copy, (c) BSI BS 8000-3:1989 This British Standard, having been prepared under the direction of the Council for Building and Civil Engineering, was published under the authority of the Board of BSI and comes into effect on 31 October 1989 BSI 01-1999 The following BSI references relate to the wo
3、rk on this standard: Committee reference B/146 Draft for comment 85/10621 DC ISBN 0 580 17766 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Council for Building and Civil Engineering (B/-) to Technical Committee B/146, upon which the
4、 following bodies were represented: Building Employers Confederation Chartered Institute of Building Consumer Policy Committee of BSI Department of the Environment (Building Research Establishment) Department of the Environment (Property Services Agency) Federation of Associations of Specialists and
5、 Sub-Contractors Institute of Clerks of Works of Great Britain Inc Institution of Civil Engineers Institution of Structural Engineers National Building Specification Ltd. National Council of Building Materials Producers National House Building Council Royal Institute of British Architects Royal Inst
6、itution of Chartered Surveyors Society of Chief Architects of Local Authorities Amendments issued since publication Amd. No.DateComments 6195May 1990Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:34:21 GMT+00:00 2006, Un
7、controlled Copy, (c) BSI BS 8000-3:1989 BSI 01-1999i Contents Page Committees responsibleInside front cover Forewordii Section 1. General 1.1Scope1 1.2References1 1.3Definitions1 Section 2. Materials handling and preparation 2.1Checking, handling and site storage of materials and components2 2.2 Pre
8、paration of work, materials and components3 Section 3. Brick/block walling 3.1General6 3.2Jointing and pointing7 3.3Laying damp-proof courses8 3.4Cavity walling10 3.5Fair faced masonry14 3.6Flues and linings14 3.7Constructional details15 Index18 Figure 1 Honeycomb sleeper wall7 Figure 2 Stepping DPC
9、 above ground8 Figure 3 DPC projections9 Figure 4 Lap of DPC at jambs10 Figure 5 Filling to bottoms of cavities10 Figure 6 Spacing of ties at openings12 Figure 7 Insulation in cavity walls13 Figure 8 Typical steel lintel16 Figure 9 Junctions between walls and joists/rafters16 Figure 10 Joist hanger
10、built into masonry17 Table 1 Grouping of mortar mixes of approximately equivalent strength and approximate yields5 Table 2 Permissible deviations in brickwork and blockwork6 Table 3 Spacing of wall ties12 List of references20 Licensed Copy: London South Bank University, London South Bank University,
11、 Fri Dec 08 05:34:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8000-3:1989 ii BSI 01-1999 Foreword This Part of BS 8000 has been prepared under the direction of the Council for Building and Civil Engineering. It makes recommendations and gives guidance on basic workmanship for conventional types
12、 of building work. The recommendations given are not necessarily comprehensive; particular project documents, e.g. project specifications, may need to cover particular recommendations not dealt with by this code of practice. This code of practice is unique in that unlike other British Standards, it
13、draws together recommendations given in other codes of practice. The purpose of this code of practice is to encourage good workmanship by providing the following: a) the most frequently required recommendations on workmanship for building work in a readily available and convenient form to those work
14、ing on site; b) assistance in the efficient preparation and administration of contracts; c) recommendations on how designers requirements for workmanship may be satisfactorily realized; d) definitions of good practice on building sites for supervision and for training purposes; this guidance is not
15、intended to supplant the normal training in craft skills; e) a reference for quality of workmanship on building sites. It is recognized that design, procurement and project information should be conducive to good workmanship on site. During the preparation of this code of practice the Building Indus
16、trys Co-ordinating Committee for Project Information (CCPI), produced a Common Arrangement of Work Sections (CAWS) for building work. This code of practice has generally been arranged in accordance with the Common Arrangement so that it can be used easily with project specifications and bills of qua
17、ntities using this arrangement. Other major documents are being restructured in accordance with the Common Arrangement. NOTEThe CCPI was sponsored by the Association of Consulting Engineers, the Building Employers Confederation, the Royal Institution of Chartered Surveyors and the Royal Institute of
18、 British Architects. When complete BS 8000 will comprise the following Parts. Part 1: Code of practice for excavation and filling; Part 2: Code of practice for concrete work; Part 3: Code of practice for masonry; Part 4: Code of practice for waterproofing; Part 5: Code of practice for carpentry, joi
19、nery and general fixings; Part 6: Code of practice for roof, slate, tile covering and cladding; Part 7: Code of practice for glazing; Part 8: Code of practice for plasterboard partitions and dry linings; Part 9: Code of practice for cement/sand floor screeds and concrete floor toppings; Part 10: Cod
20、e of practice for plastering and rendering; Part 11: Code of practice for wall and floor tiling; Part 12: Code of practice for decorative wallcoverings and painting; Part 13: Code of practice for above ground drainage and sanitary appliances; Part 14: Code of practice for below ground drainage; Part
21、 15: Code of practice for hot and cold water services (domestic scale). Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:34:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8000-3:1989 BSI 01-1999iii Technical Committees CSB/33, Structural use of masonry, CAB/
22、6, Mortar, and ECB/44, Damp-proof systems, have also participated in the preparation of this Part of BS 8000 and the content is based on and consistent with that of BS 5628. However, BS 5628 covers the subject matter more comprehensively and includes design, materials and other related aspects in ad
23、dition to workmanship on site. Attention is also drawn to the BRE Report Driving Rain Index 19761. The text of this Part of BS 8000 includes commentaries and figures. These commentaries are separately identified and are intended to be for guidance only and do not form part of the recommendations. Th
24、ey refer, unless otherwise stated, to the clause which immediately precedes each commentary. 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 no
25、t of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 20, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This w
26、ill be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:34:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08
27、05:34:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8000-3:1989 BSI 01-19991 Section 1 Section 1. General 1.1 Scope This Part of BS 8000 gives recommendations on basic workmanship and covers those tasks which are frequently carried out in relation to masonry work involving brickwork and blockwork
28、. For design aspects of masonry reference should be made to BS 5628. NOTEThis code of practice includes supplementary elements in the form of commentaries to assist in its use and understanding. Compliance with the commentaries is not necessary in order to be able to claim conformity with the standa
29、rd. 1.2 References 1.2.1 Normative references This Part of BS 8000 incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publications are listed on page 20. Subsequent amendments to, or
30、revisions of, any of these publications apply to this Part of BS 8000 only when incorporated in it by amendment or revision. 1.2.2 Informative references This Part of BS 8000 refers to other publications that provide information or guidance. Editions of these publications current at the time of issu
31、e of this standard are listed on the inside back cover, but reference should be made to the latest editions. 1.3 Definitions For the purpose of this Part of BS 8000, the definitions given in BS 6100-1.3.1:1987 and BS 6100-5.1:1985, BS 6100-5.2:1984 and BS 6100-5.3:1984 apply. Licensed Copy: London S
32、outh Bank University, London South Bank University, Fri Dec 08 05:34:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8000-3:1989 2 BSI 01-1999 Section 2 Section 2. Materials handling and preparation 2.1 Checking, handling and site storage of materials and components 2.1.1 General Keep the site clea
33、n and tidy in order that the checking, handling and storage of materials and components can be carried out speedily and effectively. 2.1.2 Checking Check delivery tickets and certificates against the specification. Examine marks and labels and the condition of materials and components. If necessary
34、refer to the supplier immediately. In particular check that: a) materials and components are clean and are not damaged or unduly wet; b) the colour of facing masonry units match approved samples or reference panels (for clay bricks see BS 3921); c) there is continuity, as far as possible, in the sup
35、ply of materials and components, and particularly of sand and cement from the same source and of materials for the approved mortar mixes for facing work. COMMENTARY. The condition of masonry units at the time of delivery may impose requirements on site before use (see 2.2.2). Sand should be visually
36、 checked for cleanliness. Testing and/or certification may be called for by the specifier. It is desirable that colour differences between consignments of masonry units do not result in banding or patchiness of colour in finished walling. Distributing units from different packs throughout the site w
37、ill help to blend units of different colour within the consignment. Some manufacturers may be able to blend the units in their factory but this has to be ascertained in advance. Where several consignments will be delivered to site over a long period of time, blending on site may not solve the proble
38、m of colour variation between consignments. The problem should be identified before deliveries begin and the manufacturer consulted. Where masonry units are delivered wrapped or banded, suitable arrangements should be made for checking them at the time of delivery. Sands and cement supplied from dif
39、ferent sources can give rise to colour variations in the mortar. This can significantly affect the appearance of walling. 2.1.3 Handling and site storage 2.1.3.1 Masonry units. Unload and handle masonry units with care to minimize soiling, chipping and breakage. Do not tip masonry units from the car
40、rier without permission. Never tip facing units. Handle loads with wrapping and banding in place unless it is impractical to do so. Use mechanical handling equipment where possible. Do not stack units directly on sulphate bearing clinker and ashes or directly on the ground. Store them in stable stac
41、ks on a prepared hardstanding area. Protect the stacks from rain and frost, and from soiling from ground and passing traffic. Protect the bottom of the stack from becoming wet from ground moisture. Stack unwrapped masonry units so as to allow free circulation of air. In addition, follow the manufact
42、urers recommendations for handling and storage. COMMENTARY. If masonry units are too wet the finished work may develop efflorescence or leaching from the joints causing white stains. The risk of unacceptable shrinkage cracking, particularly with concrete blockwork and calcium silicate brickwork, is
43、greater when units have been wetted unnecessarily because of lack of protection. 2.1.3.2 Ancillary components. Handle components, e.g. lintels, flue linings, tiles, cavity closers and edge trims with care to avoid cracking, damage to edges, damage to surfaces and coatings, distortion and soiling. St
44、ack lintels and copings of precast concrete and pressed metal the correct way up on an adequate number of level bearers clear of the ground. Cover the stacks to protect them from staining and splashing of mud, and in accordance with any additional requirements in the manufacturers instructions. Stor
45、e metal and plastics components, e.g. wall ties, straps etc., under cover and protect them from damage and distortion. 2.1.3.3 Bags of cement and hydrated lime. Where materials are to be stored for later use, unless there are small quantities only, store as follows. a) Store in a dry, weatherproof,
46、frost-free, enclosed shed or building with a dry floor. If the floor is concrete, store on a timber platform. b) Keep different materials in separate stacks. c) Stack bags away from walls, not more than eight bags high. Cover stacks with tarpaulin or polyethylene sheet. d) Stack bags so that consign
47、ments can be used in the order of delivery. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:34:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8000-3:1989 BSI 01-19993 Section 2 e) Keep cement stored on site to a practical minimum. Check materials for deteri
48、oration when taken out of storage and discard if lumpy in any way. In the case of small quantities for immediate use, if not stored in a shed or building, stand the bags on a timber platform well clear of the ground and cover with tarpaulin or polyethylene sheet so that all the bags are wholly prote
49、cted from wind and rain. COMMENTARY. Providing availability permits, do not order materials too early or too much at one time. Even if materials are protected from rain, moisture in the air will gradually cause their deterioration. Even in good conditions cement will eventually go lumpy and give lower strength. 2.1.3.4 Cement in bulk. Store cement delivered in bulk in a proper cement silo (see BS 8000-2). 2.1.3.5 Sand, aggregates and mortars a) Store different sands, aggregates and lime/sand mixes in different st