ISO INTERNATIONAL STANDARD 7976-2 First edition 1989-03-01 Tolerances for building - Methods of measurement of buildings and building products - Part 2 : Position of measuring points Tolerances pour le batiment - Methodes de mesure des batiments et des produits pourlebatiment Partie 2 : Positions des points de mesure Reference number ISO 7976-2 : 1989 (E) ISO7976-2 : 1989 (E) Foreword national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through Iso technical committees. Each member body interested in a subject for which a technical committee has been established has mental and non-governmental,in liaisonwithIsO,also take part inthe work.Iso collaborates closely withtheInternational Electrotechnical Commission(lEC)on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 7976-2 was prepared by Technical Committee ISO/TC 59, Building construction. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. ? InternationalOrganizationforStandardization,1989 Printed in Switzerland ii ISO 7976-2 : 1989 (E) Contents Page Scope and field of application 2Reference 3General. Section one : Position of measuring points for those measurements which can be carried out both in factories and on building sites 4 Sizes of components 2 4.1 Length and width 2 4.2 Thickness or depth 3 5 Squarenessofcomponents 7 5.1Angular deviation 7 5.2 Parallelism 9 6 Straightness and camber of components 9 6.1Edge straightness 9 6.2 Designed camber. 10 7 Flatness and skewness of components 11 7.1 Principles of measurement 11 7.2 Overall flatness 11 7.3 Local flatness 12 7.4Skewness 12 Section two : Position of measuring points for those measurements which can be carried out on building sites only 8 Position in the horizontal plane 13 8.1Deviationsinrelationtostructuralgrid lines 13 8.2 Deviations in relation to secondary lines parallel to the building 14 8.3 Deviations in relation to secondary lines perpendicular to the building . 14 9 Deviations from level (levelling). . . 15 ili