ISO 16696-1:2019
(Main)Timber structures — Cross laminated timber — Part 1: Component performance, production requirements and certification scheme
Timber structures — Cross laminated timber — Part 1: Component performance, production requirements and certification scheme
This document establishes the basic principles for component performance and minimum production requirements for cross laminated timber (CLT). This document also contains scheme requirements for conformance, as provided in Annex D. The document is applicable to CLT products which are manufactured from solid-sawn timber or wood based panels built up of at least three layers in which the grain of adjoining layers are at right angles to each other. This document provides CLT dimension tolerances; component requirements; performance criteria; production, testing and trade marking guidance; and minimum requirements for factory production control. This document is based on known species, species combination and/or wood based panel structural performance and bondability. CLT qualified in accordance with the provisions of this document are intended to resist the effects of moisture on structural performance as can occur due to construction delays or other conditions of similar severity. NOTE This document does not include how CLT is to be used and installed, as it will be detailed in ISO 16696-2.
Structures en bois — Plaques reconstituées à base de lamelles croisées — Partie 1: Performances des composants et exigences de production et système de certification
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INTERNATIONAL ISO
STANDARD 16696-1
First edition
2019-02
Timber structures — Cross laminated
timber —
Part 1:
Component performance, production
requirements and certification scheme
Structures en bois — Plaques reconstituées à base de lamelles
croisées —
Partie 1: Performances des composants et exigences de production et
système de certification
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and subscripts . 6
4.1 Symbols . 6
4.2 Subscripts . 6
5 CLT panel dimensional tolerances . 7
5.1 Dimensional tolerances at time of manufacture . 7
5.1.1 General. 7
5.1.2 Panel thickness . 7
5.1.3 Layer thickness . . . 7
5.1.4 Panel width . 7
5.1.5 Panel length . 7
5.1.6 Grooves and edge bonds . 7
5.2 Squareness . 7
5.3 Straightness . 8
6 Component requirements . 8
6.1 Solid sawn timber . 8
6.1.1 Solid sawn timber species . 8
6.1.2 Solid sawn timber sizes . . . 8
6.1.3 Moisture content . 8
6.1.4 Solid sawn timber face-bonding surface . 8
6.1.5 Face-bonding dimensional tolerances . 9
6.2 Wood based panels . 9
6.2.1 General. 9
6.2.2 Moisture content . 9
6.2.3 Wood based panels face-bonding surface . 9
6.2.4 Face-bonding dimensional tolerances . 9
6.3 Adhesive requirements . 9
6.3.1 General. 9
6.3.2 Testing for minor changes of adhesive systems . 9
6.3.3 Finger joints in laminations when used . 9
6.3.4 Edge joints in laminations when used.10
6.3.5 Glue line integrity for glue lines between layers (face joints) .10
6.3.6 Shear strength of edge bonds in solid sawn timber layers .10
6.4 Large finger joints of panels .10
6.4.1 General.10
6.4.2 Bending strength .10
7 Cross laminated timber performance criteria .10
7.1 Layup requirements .10
7.2 Mechanical resistance of cross laminated timber products.11
7.3 Durability against biological attack.11
7.3.1 General.11
7.3.2 Solid sawn timber layers without preservative treatment .11
7.3.3 Solid sawn timber layers with preservative treatment .11
7.3.4 CLT treated with preservative treatment .11
7.4 Formaldehyde emission .12
7.5 Dimensional stability .12
7.5.1 General.12
7.5.2 Maximum deviations .12
7.5.3 Corrected sizes and moisture deformation factor .12
7.6 Appearance classification .12
8 Production, testing, and trade marking .13
Annex A (normative) Panel layup (construction) .16
Annex B (normative) Examples of CLT appearance classification .17
Annex C (normative) Ply grading .18
Annex D (normative) Production assessment, trade marking and factory production control .19
Annex E (informative) Supplementary properties .24
Bibliography .25
iv © ISO 2019 – All rights reserved
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 the right to be represented on that committee. International
organizations, governmental 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 procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 165, Timber structures.
A list of all parts in the ISO 16696 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
Introduction
The general principle of this document is that a certain level of performance and production techniques
are required in the production of cross laminated timber (CLT) to be ac
...
INTERNATIONAL ISO
STANDARD 16696-1
First edition
2019-02
Timber structures — Cross laminated
timber —
Part 1:
Component performance, production
requirements and certification scheme
Structures en bois — Plaques reconstituées à base de lamelles
croisées —
Partie 1: Performances des composants et exigences de production et
système de certification
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and subscripts . 6
4.1 Symbols . 6
4.2 Subscripts . 6
5 CLT panel dimensional tolerances . 7
5.1 Dimensional tolerances at time of manufacture . 7
5.1.1 General. 7
5.1.2 Panel thickness . 7
5.1.3 Layer thickness . . . 7
5.1.4 Panel width . 7
5.1.5 Panel length . 7
5.1.6 Grooves and edge bonds . 7
5.2 Squareness . 7
5.3 Straightness . 8
6 Component requirements . 8
6.1 Solid sawn timber . 8
6.1.1 Solid sawn timber species . 8
6.1.2 Solid sawn timber sizes . . . 8
6.1.3 Moisture content . 8
6.1.4 Solid sawn timber face-bonding surface . 8
6.1.5 Face-bonding dimensional tolerances . 9
6.2 Wood based panels . 9
6.2.1 General. 9
6.2.2 Moisture content . 9
6.2.3 Wood based panels face-bonding surface . 9
6.2.4 Face-bonding dimensional tolerances . 9
6.3 Adhesive requirements . 9
6.3.1 General. 9
6.3.2 Testing for minor changes of adhesive systems . 9
6.3.3 Finger joints in laminations when used . 9
6.3.4 Edge joints in laminations when used.10
6.3.5 Glue line integrity for glue lines between layers (face joints) .10
6.3.6 Shear strength of edge bonds in solid sawn timber layers .10
6.4 Large finger joints of panels .10
6.4.1 General.10
6.4.2 Bending strength .10
7 Cross laminated timber performance criteria .10
7.1 Layup requirements .10
7.2 Mechanical resistance of cross laminated timber products.11
7.3 Durability against biological attack.11
7.3.1 General.11
7.3.2 Solid sawn timber layers without preservative treatment .11
7.3.3 Solid sawn timber layers with preservative treatment .11
7.3.4 CLT treated with preservative treatment .11
7.4 Formaldehyde emission .12
7.5 Dimensional stability .12
7.5.1 General.12
7.5.2 Maximum deviations .12
7.5.3 Corrected sizes and moisture deformation factor .12
7.6 Appearance classification .12
8 Production, testing, and trade marking .13
Annex A (normative) Panel layup (construction) .16
Annex B (normative) Examples of CLT appearance classification .17
Annex C (normative) Ply grading .18
Annex D (normative) Production assessment, trade marking and factory production control .19
Annex E (informative) Supplementary properties .24
Bibliography .25
iv © ISO 2019 – All rights reserved
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 the right to be represented on that committee. International
organizations, governmental 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 procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 165, Timber structures.
A list of all parts in the ISO 16696 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
Introduction
The general principle of this document is that a certain level of performance and production techniques
are required in the production of cross laminated timber (CLT) to be ac
...
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