ISO 16696-1:2019
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.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and subscripts
4.1 Symbols
4.2 Subscripts
5 CLT panel dimensional tolerances
5.1 Dimensional tolerances at time of manufacture
5.1.1 General
5.1.2 Panel thickness
5.1.3 Layer thickness
5.1.4 Panel width
5.1.5 Panel length
5.1.6 Grooves and edge bonds
5.2 Squareness
5.3 Straightness
6 Component requirements
6.1 Solid sawn timber
6.1.1 Solid sawn timber species
6.1.2 Solid sawn timber sizes
6.1.3 Moisture content
6.1.4 Solid sawn timber face-bonding surface
6.1.5 Face-bonding dimensional tolerances
6.2 Wood based panels
6.2.1 General
6.2.2 Moisture content
6.2.3 Wood based panels face-bonding surface
6.2.4 Face-bonding dimensional tolerances
6.3 Adhesive requirements
6.3.1 General
6.3.2 Testing for minor changes of adhesive systems
6.3.3 Finger joints in laminations when used
6.3.4 Edge joints in laminations when used
6.3.5 Glue line integrity for glue lines between layers (face joints)
6.3.6 Shear strength of edge bonds in solid sawn timber layers
6.4 Large finger joints of panels
6.4.1 General
6.4.2 Bending strength
7 Cross laminated timber performance criteria
7.1 Layup requirements
7.2 Mechanical resistance of cross laminated timber products
7.3 Durability against biological attack
7.3.1 General
7.3.2 Solid sawn timber layers without preservative treatment
7.3.3 Solid sawn timber layers with preservative treatment
7.3.4 CLT treated with preservative treatment
7.4 Formaldehyde emission
7.5 Dimensional stability
7.5.1 General
7.5.2 Maximum deviations
7.5.3 Corrected sizes and moisture deformation factor
7.6 Appearance classification
8 Production, testing, and trade marking
Annex A (normative) Panel layup (construction)
Annex B (normative) Examples of CLT appearance classification
Annex C (normative) Ply grading
Annex D (normative) Production assessment, trade marking and factory production control
Annex E (informative) Supplementary properties
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and subscripts
4.1 Symbols
4.2 Subscripts
5 CLT panel dimensional tolerances
5.1 Dimensional tolerances at time of manufacture
5.1.1 General
5.1.2 Panel thickness
5.1.3 Layer thickness
5.1.4 Panel width
5.1.5 Panel length
5.1.6 Grooves and edge bonds
5.2 Squareness
5.3 Straightness
6 Component requirements
6.1 Solid sawn timber
6.1.1 Solid sawn timber species
6.1.2 Solid sawn timber sizes
6.1.3 Moisture content
6.1.4 Solid sawn timber face-bonding surface
6.1.5 Face-bonding dimensional tolerances
6.2 Wood based panels
6.2.1 General
6.2.2 Moisture content
6.2.3 Wood based panels face-bonding surface
6.2.4 Face-bonding dimensional tolerances
6.3 Adhesive requirements
6.3.1 General
6.3.2 Testing for minor changes of adhesive systems
6.3.3 Finger joints in laminations when used
6.3.4 Edge joints in laminations when used
6.3.5 Glue line integrity for glue lines between layers (face joints)
6.3.6 Shear strength of edge bonds in solid sawn timber layers
6.4 Large finger joints of panels
6.4.1 General
6.4.2 Bending strength
7 Cross laminated timber performance criteria
7.1 Layup requirements
7.2 Mechanical resistance of cross laminated timber products
7.3 Durability against biological attack
7.3.1 General
7.3.2 Solid sawn timber layers without preservative treatment
7.3.3 Solid sawn timber layers with preservative treatment
7.3.4 CLT treated with preservative treatment
7.4 Formaldehyde emission
7.5 Dimensional stability
7.5.1 General
7.5.2 Maximum deviations
7.5.3 Corrected sizes and moisture deformation factor
7.6 Appearance classification
8 Production, testing, and trade marking
Annex A (normative) Panel layup (construction)
Annex B (normative) Examples of CLT appearance classification
Annex C (normative) Ply grading
Annex D (normative) Production assessment, trade marking and factory production control
Annex E (informative) Supplementary properties
Bibliography