BS_8000-3-2020.pdf

BS8000-3:2020BSI Standards PublicationWorkmanship on construction sitesPart 3:Masonry-Code of practicebsi.BRITISH STANDARDBS8000-3:2020ContentsPageForewordiii1Scope2Normative references3Terms and definitions3Health and safety45 Accuracy45.1GeneralFigure 1-Dimensional variability for components,prepared space and joints5.2Specifying accuracy5.3Achieving accuracy5.4Nominal dimensions5.5Grid lines and setting out66Materials,handling and preparation66.1Brick and block66.2Stone(manufactured and natural)日6.3Ancillary and other components96.4Mortars/mix constituents(e.g.cement,lime and sand)10Installation and/or execution127.1Brick and block12Figure 2-Protecting brickwork13Table 1-Spacing of wall ties16Figure 3-Spacing of ties16Figure 4-DPC at base of wall19Figure 5-Cavity tray installation20Figure 6-Flashing and cavity tray junction20Figure 7-Chimney on outside wallFigure 8-Chimney with DPC tray and flashingFigure 9-Chimney at ridge44Figure 10-Vertical DPC at opening22Figure 11-Stepping DPC above groundFigure 12-Insulation in cavity wallsFigure 13-Bond design in fair-faced masonryFigure 14-Cappings and copings to a masonry wallFigure 15-Creasing tiles used as a capping34678Table 2-Minimum bearing lengthFigure 16-Steel lintels2Figure 17-Intersections in brick or block wallFigure 18-Junctions between walls and joists/rafters30Figure 19-Typical joist hanger built into masonryTable 3-Permissible deviations for masonry elements3Figure 20-DPC tray extended through the liner into the flue7.2 Stone36Table 4-Permissible deviations in masonry(other than stone masonry)6Table 5-Permissible deviations in stone masonry368 Checking9 Handover9.1Efflorescence379.2 Lime stainingTHE BRITISH STANDARDS INSTITUTION 2020-ALL RIGHTS RESERVED IBS8000-3:2020BRITISH STANDARD9.3 Assessment of fair-faced masonry38Annex A(informative)Site method for assessing dimensions and tolerances of clay and masonryunits manufactured to a standard UK work size39Figure A.1-Arrangement of bricks for measurement of dimension40Table A.1-Tolerance category criteria40Figure A.2-Brick measurement positions40Table A.2-Range category criteria41Annex B(informative)Example report format for Procedure B outlined in Annex A42Bibliography43Summary of pagesThis document comprises a front cover,and inside front cover,pages i to iv,pages 1 to 43,an inside back cover anda back cover.II THE BRITISH STANDARDS INSTITUTION 2020-ALL RIGHTS RESERVEDBRITISH STANDARDBS8000-3:2020ForewordPublishing informationThis part of BS 8000 is published by BSI Standards Limited,under licence from The British StandardsInstitution,and came into effect on 31 May 2020.It was prepared by Subcommittee B/525/6,Use ofmasonry,under the authority of Technical Committee B/525,Building and civil engineering structures.A list of organizations represented on this committee can be obtained on request to its secretary.SupersessionThis part of BS 8000 supersedes BS 8000-3:2001,which is withdrawn.Relationship with other publicationsBS 8000 is a series of standards describing the execution of works for a range of constructionactivities.They are issued to fill a gap in the authoritative information that is available to thosespecifying,supervising and instructing in connection with those activities and to assist indescribing processes to ensure a better and common understanding of them and so improveconstruction quality.The various parts of BS 8000 draw content from,and relate to,other relevant British Standards andcodes.This part of BS 8000 makes recommendations and gives guidance on masonry.It is intendedto be read in conjunction with BS 8000-0,which encourages liaison between and awareness ofadjoining/dependent trades and processes in the construction sequence(whether or not they aresubject to one of the specialist titles in the series).The content of BS 8000-3 is consistent with that of BS EN 1996-1-1:2005+A1,BS EN 1996-1-2,BS EN 1996-2:2006,BS EN 1996-3 and the relevant National Annexes and PD 6697:2019The users attention is also drawn to Directional driving rain indices for the United KingdomComputation and mapping 1.In this part of BS 8000,commentary on the relevant principles accompanies the recommendationsthat are made.The commentary is intended to provide further guidance.Information about this documentThe recommendations given are not fully comprehensive as particular project documents,e.g.projectspecifications,might need to cover particular recommendations not dealt with by this standard.Thisstandard might not be applicable to the use of some proprietary systems.The purpose of BS 8000-3 is to encourage good workmanship by providing:a)the most frequently required recommendations on workmanship for building work in a readilyavailable and convenient form to those working on site;b)assistance in the efficient preparation and administration of contracts;c)recommendations on how designersrequirements for workmanship can besatisfactorily realized;d)guidance on good practice on building sites for supervision and for training purposes(thisguidance is not intended to supplant the normal training in craft skills);e)a reference for quality of workmanship on building sites;andf)the recognition that design,procurement and project information are intended to be conduciveto good workmanship on site.THE BRITISH STANDARDS INSTITUTION 2020-ALL RIGHTS RESERVED III