ISO INTERNATIONAL STANDARD 7976-1 First edition 1989-03-01 Tolerances for building Methods of measurement of buildings and building products Part 1 : Methods and instruments Tolerances pour le batiment - Methodes de mesure des batiments et des produits pourlebatiment Partie 1: Methodes et instruments Reference number ISO 7976-1 : 1989 (E) No reproduction or networking permited without license from IHS Not for Resale ISO 7976-1 : 1989 (E) Foreword ISo (the International Organization for Standardization) is a worldwide federation of 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 liaison with iso, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. the member bodies for approval before their acceptance as International Standards by least 75 % approval by the member bodies voting. International Standard ISO 7976-1 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 latestedition,untess otherwisestated. International OrganizationforStandardization,1989 Printed in Switzerland No reproduction or networking permitted without license from IHS Not for Resale ISO 7976-1 : 1989 (E) Contents Page Scope and field of application . 2 References 3 General.. 3.1 Methods of measurement. 3.2 Influence of deviations from reference conditions 2 Section one: Measuring methods for those measurements which can be carried out both in factories and on building sites 4 Sizes of components 4.1 Length and width. . 4 4.2Thickness or depth 7 4.3 Accuracy table .. 8 5Squareness (perpendicularity) of components 8 5.iAngulardeviation 10 5.2 Parallelism.. 15 5.3 Accuracy table .. 15 6Straightness and camber of components 16 6.1 Straightness . 17 6.2 Designed camber. 18 6.3 Accuracy table. 19 7 Flatness and skewness of components . 19 7.1 Principles of measurement . 19 7.2 Overall flatness. 22 7.3 Local flatness 25 7.4 Skewness. 28 7.5 Methods and equipment when measuring components according to the box principle... 29 7.6 Accuracy table . 32 Section two: Measuring methods for those measurements which can be carried out on building sites only 8 Position in the horizontal plane . 37 8.1 Deviations in relation to structural grid lines 37 Copyright Intemational Organization for Standardization ii e from IHS Not for Resal