EN 16351:2021

Timber structures - Cross laminated timber - Requirements

EN 16351:2021

Name:EN 16351:2021   Standard name:Timber structures - Cross laminated timber - Requirements
Standard number:EN 16351:2021   language:English language
Release Date:02-Mar-2021   technical committee:CEN/TC 124 - Timber structures
Drafting committee:CEN/TC 124/WG 3 - Glued laminated timber   ICS number:79.060.10 - Plywood

SLOVENSKI STANDARD
01-julij-2021
Nadomešča:
SIST EN 16351:2015
Lesene konstrukcije - Križno lamelirani les - Zahteve
Timber structures - Cross laminated timber - Requirements
Holzbauwerke - Brettsperrholz - Anforderungen
Structures en bois - Bois lamellé croisé - Exigences
Ta slovenski standard je istoveten z: EN 16351:2021
ICS:
79.060.10 Vezan les Plywood
91.080.20 Lesene konstrukcije Timber structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 16351
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 79.060.10 Supersedes EN 16351:2015
English Version
Timber structures - Cross laminated timber -
Requirements
Structures en bois - Bois lamellé croisé - Exigences Holzbauwerke - Brettsperrholz - Anforderungen
This European Standard was approved by CEN on 4 January 2021.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16351:2021 E
worldwide for CEN national Members.

Contents                                                          Page
European foreword . 4
Introduction . 5
1 Scope . 7
2 Normative references . 8
3 Terms, definitions and symbols .10
3.1 Terms and definitions .10
3.2 Symbols .16
3.2.1 Main symbols .16
3.2.2 Subscripts .17
4 Characteristics .19
4.1 Modulus of elasticity, bending strength, compressive strength, tensile strength and
shear strength .19
4.1.1 General .19
4.1.2 Geometrical data of cross laminated timber .21
4.1.3 Strength, stiffness and density properties of layers .22
4.1.4 Bending strength of large finger joints .24
4.1.5 Rolling shear strength, compression strength perpendicular to grain and density of
cross laminated timber .24
4.2 Bonding strength .25
4.2.1 General .25
4.2.2 Bonding strength of glue lines between layers .25
4.2.3 Bonding strength of structural edge bonds .26
4.2.4 Bonding strength of large finger joints .26
4.3 Resistance to fire .26
4.4 Reaction to fire .27
4.4.1 General .27
4.4.2 Classification without further testing .27
4.4.3 Classification based on testing .29
4.5 Dimensional stability .30
4.6 Emission of formaldehyde .30
4.7 Durability .31
4.7.1 Durability of bonding strength .31
4.7.2 Durability of other characteristics .32
5 Assessment and Verification of Constancy of Performance (AVCP) .33
5.1 General .33
5.2 Type testing .33
5.2.1 General .33
5.2.2 Test samples, testing and compliance criteria .34
5.2.3 Test reports .41
5.3 Factory production control (FPC) .41
5.3.1 General .41
5.3.2 Provisions .41
5.3.3 Initial inspection of factory and of FPC .51
5.3.4 Continuous surveillance of FPC .51
5.3.5 Procedure for modifications .51
Annex A (normative) Delamination test of glue lines between layers . 52
Annex B (normative) Tests with laminations with or without finger joints . 56
Annex C (normative) Determination of strength, stiffness and density characteristics of
cross laminated timber . 59
Annex D (normative) Measurement of moisture content . 76
Annex E (normative) Adhesive application for finger joints in laminations. 77
Annex F (normative) Minimum production provisions . 78
Annex G (normative) Shear tests. 92
Annex H (normative) Additional test methods and requirements for adhesives of subclass
FJ for use in structural edge bonds . 95
Bibliography . 96

European foreword
This document (EN 16351:2021) has been prepared by Technical Committee CEN/TC 124 “Timber
structures”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2021, and conflicting national standards shall
be withdrawn at the latest by December 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 16351:2015.
The following changes have been made:
— the standard has been adjusted to the latest versions of standards for adhesives;
— the provisions for reaction and resistance to fire have been modified;
— the provisions for gap widths and ratios of lamination width by thickness have been modified;
— missing provisions for factory production control have been added;
— the provisions for determination of strength, stiffness and density characteristics of cross laminated
timber have been modified;
— the standard has been adjusted to the latest templates;
— Annex ZA has been deleted.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Introduction
Figure 1 shows the relation of some European Standards on structural timber products.

Key
1 boards 6 glued laminated timber (glulam)
2 is a component for 7 glulam with large finger joints
3 structural finger jointed timber 8 block glued glulam
4 glued laminated products 9 cross laminated timber
5 glued solid timber 10 cross laminated timber with large finger joints
Figure 1 — Relation of some European Standards on structural timber products

Cross laminated timber in accordance with this document and multilayer solid wood panels in
accordance with EN 13353 may have the same layup, but for cross laminated timber the timber is
strength graded according to EN 14081-1 and the adhesives are tested according to the provisions of this
document.
The following standards mentioned in Clause 2, EN 13986, EN 14080, EN 14081-1, EN 14374 and
EN 15497, are harmonized product standards. The applicable version cited in the Official Journal of the
EU are not necessarily the latest published by CEN.
1 Scope
This document sets out provisions regarding the performance of characteristics of the following Types of
cross laminated timber for use in buildings and bridges:
— Type 1: Straight or curved cross laminated timber comprising only timber layers but no large finger
joints;
— Type 2: Straight cross laminated timber comprising only timber layers and large finger joints;
— Type 3: Straight cross laminated timber comprising timber and wood-based panel layers but no large
finger joints.
This document covers cross laminated timber of all three Types of cross laminated timber:
— manufactured according to this document, which sets up provisions for:
— boundary conditions during manufacture of cross laminated timber;
— moisture content and temperature of timber to be bonded;
— production of finger joints and bonds between layers;
— to be used in service class 1 or 2 according to EN 1995-1-1;
— made of coniferous species and poplar listed in this document;
— which may be made of layer
...

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