kSIST FprEN 16351:2020

Timber structures - Cross laminated timber - Requirements

This document sets out requirements regarding the performance of characteristics of the following types of cross laminated timber to be used 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.
It also lays down procedures for assessment and verification of constancy of performance (AVPC) of characteristics and specifies marking and labelling of cross laminated timber.
This document covers cross laminated timber of all three types of cross laminated timber:
-   manufactured according to this standard, 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 standard;
-   which may be made of layers made of different species having similar properties;
-   bonded with phenolic or aminoplastic or moisture curing one-component polyurethane or emulsion polymer isocyanate adhesives of adhesive type I according to the respective standard;
-   built up of at least three orthogonally bonded layers (at least two of them timber layers);
-   which may have, depending on the number of layers, adjacent layers bonded parallel to the grain;
-   made of timber layers which are made of strength graded timber according to EN 14081 1;
-   made of timber layers having nominal thicknesses between 6 mm (including) and 60 mm (including) depending on the layup;
-   made of timber layers
-   which may comprise non-structural edge bonds; and
-   have a mean gap width of less than or equal to 0,6 mm and a 90th percentile of the gap width of 2 mm;
-   having nominal overall thicknesses up to 500 mm.
Additional provisions of this document apply for straight cross laminated timber comprising only timber layers and comprising large finger joints (type 2):
-   made from cross laminated timber pieces having the same cross-section and layup;
-   made from cross laminated timber pieces having nominal cross-sectional thicknesses from 51 mm (including) up to 345 mm (including) and nominal minimum thicknesses of the outer layers not less than 17 mm (including).
-   made from cross laminated timber pieces solely comprising timber layers;
-   made from plane cross laminated timber pieces;
-   with parallel x-axes of the jointed components;
-   with finger joints having a finger length of at least 45 mm and fingers which are visible at the two narrow sides of the components;
-   bonded with phenolic or aminoplastic or moisture curing one-component polyurethane adhesives of adhesive type I according to the respective standard.
Additional provisions of this document apply for straight cross laminated timber comprising timber and wood-based panel layers but no large finger joints (type 3):
-   made of structural wood-based panels specified in this European standard;
-   made of one panel per layer and;
-   having thicknesses between 6 mm (including) and 45 mm (including);
This document applies to cross laminated timber untreated or treated against biological attack.
This document  does not cover:
-   cross laminated timber treated with fire retardants;
-   cross laminated timber which is produced from re-used timber or wood-based panels comprising re-used timber.

Holzbauwerke - Brettsperrholz - Anforderungen

In diesem Dokument werden die Anforderungen an die Leistungsmerkmale der folgenden Arten von Brett-sperrholz festgelegt, die in Gebäuden und Brücken verwendet werden:
-   Typ 1 ebenes oder gekrümmtes Brettsperrholz, das nur Brettlagen, aber keine Universal-Keilzinken-verbindungen umfasst;
-   Typ 2: ebenes Brettsperrholz, das nur Brettlagen und Universal-Keilzinkenverbindungen umfasst;
-   Typ 3: ebenes Brettsperrholz, das Bretter und Holzwerkstofflagen, aber keine Universal-Keilzinken-verbindungen umfasst.
Darüber hinaus legt die Norm auch Verfahren zur Bewertung und Überprüfung der Leistungsbeständigkeit (AVCP) von Merkmalen sowie die Kennzeichnung und Etikettierung von Brettsperrholz fest.
Dieses Dokument gilt für alle drei Arten von Brettsperrholz:
-   das nach dieser Norm hergestellt wurde, die folgende Bestimmungen festlegt:
-   Randbedingungen bei der Herstellung von Brettsperrholz;
-   Feuchtegehalt und Temperatur der zu verklebenden Bretter;
-   Herstellung von Keilzinkenverbindungen und Klebverbindungen zwischen Lagen;
-   das in der Nutzungsklasse 1 oder 2 nach EN 1995 1 1 angewendet wird;
-   das aus Pappel oder Nadelholzarten besteht, die in dieser Norm aufgeführt sind;
-   das aus Lagen bestehen darf, die aus verschiedenen Holzarten mit ähnlichen Eigenschaften hergestellt sind;
-   das mit Phenoplast  und Aminoplast-Klebstoffen oder einem feuchtigkeitsvernetzenden Ein-komponenten-Klebstoff auf Polyurethanbasis oder Emulsion-Polymer-Isocyanat-Klebstoffen vom Typ I nach der jeweiligen Norm verklebt ist;
-   das aus mindestens drei rechtwinklig zueinander verklebten Lagen (mindestens zwei Lagen sind Brettlagen) besteht;
-   bei dem je nach Anzahl der Lagen aneinandergrenzende Lagen parallel zur Faser verklebt werden dürfen;
-   das aus Lagen aus Vollholz (Bretter oder Bohlen, im Folgenden als Bretter bezeichnet) besteht, das entsprechend EN 14081 1 nach Festigkeit sortiert ist;
-   das aus Brettlagen mit Nenndicken von 6 mm (einschließlich) bis 60 mm (einschließlich) besteht, je nach Aufbau;
-   das aus Brettlagen besteht;
-   das möglicherweise keine Schmalseitenverklebungen für tragende Zwecke enthält; und
   das eine mittlere Spaltbreite von kleiner oder gleich 0,6 mm und ein 90. Perzentil der Spaltbreite von 2 mm aufweist;
-   das Gesamt-Nenndicken von bis zu 500 mm hat.
Zusätzliche Bestimmungen dieses Dokuments gelten für ebenes Brettsperrholz, das nur Brettlagen und Universal-Keilzinkenverbindungen (Typ 2) enthält:
-   das aus Brettsperrholzstücken mit gleichem Querschnitt und Aufbau besteht;
-   das aus Brettsperrholzstücken mit Querschnitts-Nenndicken von 51 mm (einschließlich) bis 345 mm (einschließlich) besteht, wobei die Mindest-Nenndicken der äußeren Lagen mindestens 17 mm (einschließlich) betragen;
-   das aus Brettsperrholzstücken besteht, die ausschließlich Brettlagen enthalten;
-   das aus ebenen Brettsperrholzstücken besteht;
-   mit parallelen x Achsen der verbundenen Bauteile;
-   das Keilzinkenverbindungen mit einer Keilzinkenlänge von mindestens 45 mm enthält, wobei die Keilzinken an den beiden Schmalseiten der Komponenten sichtbar sind;
-   das mit Phenoplast  und Aminoplast-Klebstoffen oder einem feuchtigkeitsvernetzenden Ein-komponenten-Klebstoff auf Polyurethanbasis vom Typ I nach der jeweiligen Norm verklebt ist.
Zusätzliche Bestimmungen dieses Dokuments gelten für ebenes Brettsperrholz, das Bretter und Holz-werkstofflagen, aber keine Universal Keilzinkenverbindungen (Typ 3) enthält:
-   das aus den in dieser Europäischen Norm festgelegten Holzwerkstoffen für tragende Zwecke besteht;
-   das aus einer Platte je Lage besteht und;
-   mit Dicken zwischen 6 mm (einschließlich) und 45 mm (einschließlich).
Dieses Dokument gilt für Brettsperrholz, das unbehandelt ist oder gegen biologischen Befall behandelt wurde.
...

Structures en bois - Bois lamellé croisé - Exigences

Le présent document établit les exigences relatives aux propriétés pour les types suivants de bois lamellé croisé devant être utilisés dans les bâtiments et les ponts :
-   type 1 : Bois lamellé croisé, droit ou courbe, constitué uniquement de couches de bois et sans aboutage à entures multiples de grandes dimensions ;
-   type 2 : Bois lamellé croisé droit, constitué uniquement de couches de bois et comprenant des aboutages à entures multiples de grandes dimensions ;
-   type 3 : Bois lamellé croisé droit, constitué de couches de bois et de couches en panneaux à base de bois, sans aboutage à entures multiples de grandes dimensions.
Il établit également les procédures d'évaluation et de vérification de la constance des performances (EVCP) pour les caractéristiques et spécifie le marquage et l'étiquetage du bois lamellé croisé.
Le présent document couvre le bois lamellé croisé appartenant à l'ensemble des trois types de bois lamellé croisé :
-   fabriqué conformément à la présente norme, qui établit les dispositions pour :
-   les exigences minimales relatives à la fabrication du bois lamellé croisé ;
-   la teneur en humidité et la température du bois à coller ;
-   la production des aboutages à entures multiples et du collage entre les couches ;
-   destiné à être utilisé en classe de service 1 ou 2 conformément à l'EN 1995 1 1 ;
-   constitué des essences de bois de résineux et de peuplier énumérés dans la présente norme ;
-   qui peut être constitué de couches provenant de différentes essences avec des propriétés similaires ;
-   collé avec des adhésifs de nature phénolique ou aminoplaste, des adhésifs polyuréthane monocomposants durcissant à l'humidité ou des adhésifs à base d'isocyanate et de polymère en émulsion de type I conformément à la norme correspondante ;
-   constitué d'au moins trois couches collées orthogonalement (au moins deux d'entre elles étant des couches de bois) ;
-   pouvant comporter, en fonction du nombre de couches, des couches contigües collées parallèlement au fil ;
-   comportant des couches de bois constituées de bois classé pour sa résistance mécanique conformément à l'EN 14081 1 ;
-   constitué de couches de bois avec une épaisseur nominale comprise entre 6 mm et 60 mm selon la combinaison ;
-   constitué de couches de bois :
-   pouvant comporter des collages sur chant non structuraux ; et
-   possédant une largeur de jeu moyenne inférieure ou égale à 0,6 mm et un 90e percentile pour la largeur de jeu de 2 mm ;
-   ayant des épaisseurs totales nominales inférieures ou égales à 500 mm.
Des dispositions supplémentaires du présent document s'appliquent au bois lamellé croisé droit, constitué uniquement de couches de bois avec aboutages à entures multiples de grandes dimensions (type 2) :
-   constitué de pièces de bois lamellé croisé ayant la même section transversale et la même combinaison ;
-   constitué de pièces de bois lamellé croisé ayant des épaisseurs de section transversale nominales comprises entre 51 mm (inclus) et 345 mm (inclus), ainsi que des épaisseurs minimales nominales des couches extérieures supérieures ou égales à 17 mm ;
-   constitué de pièces de bois lamellé croisé comprenant uniquement des couches de bois ;
-   constitué de pièces de bois lamellé croisé planes ;
-   avec des axes x parallèles pour les composants aboutés ;
-   avec des aboutages à entures multiples ayant une longueur d'au moins 45 mm et des entures qui sont visibles au niveau des deux faces étroites des composants ;
-   collé avec des adhésifs de nature phénolique ou aminoplaste, ou des adhésifs polyuréthane monocomposants durcissant à l'humidité de type I conformément à la norme correspondante.
...

Lesene konstrukcije - Križno lamelirani les - Zahteve

Standards Content (sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lesene konstrukcije - Križno lamelirani les - ZahteveHolzbauwerke - Brettsperrholz - AnforderungenStructures en bois - Bois lamellé croisé - ExigencesTimber structures - Cross laminated timber - Requirements91.080.20Lesene konstrukcijeTimber structures79.060.10Vezan lesPlywoodICS:Ta slovenski standard je istoveten z:prEN 16351oSIST prEN 16351:2019en,fr,de01-januar-2019oSIST prEN 16351:2019SLOVENSKI

STANDARD
oSIST prEN 16351:2019
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
DRAFT prEN 16351
November
t r s z ICS
y {ä r x rä s r Will supersede EN
s x u w sã t r s wEnglish Version

Timber structures æ Cross laminated timber æ Requirements Structures en bois æ Bois lamellé croisé æ Exigences

Holzbauwerke æ Brettsperrholz æ Anforderungen This draft European Standard is submitted to CEN members for enquiryä It has been drawn up by the Technical Committee

If this draft becomes a European Standardá CEN members are bounwhich stipulate the conditions for giving this European Standard the status of a national standard without any alterationä

This draft European Standard was established by CEN in three ofer language made by translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

Recipients of this draft are invited to submitá with their commentsá notification of any relevant patent rights of which they are aware and to provide supporting documentationä

Warning ã This document is not a European Standardä It is distributed for review and commentsä It is subject to change without notice and shall not be referred to as a European Standardä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels

t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä prEN

s x u w sã t r s z EoSIST prEN 16351:2019

prEN 16351:2018 (E) 2 Contents Page European foreword ............................................................................................................................................. 5 Introduction .......................................................................................................................................................... 6 1 Scope .......................................................................................................................................................... 7 2 Normative references .......................................................................................................................... 8 3 Terms and definitions .......................................................................................................................10 4 Symbols ...................................................................................................................................................14 4.1 Main symbols ........................................................................................................................................14 4.2 Subscripts ...............................................................................................................................................15 5 Designation............................................................................................................................................16 6 Components and product characteristics ..................................................................................16 6.1 Component characteristics ..............................................................................................................16 6.1.1 Timber .....................................................................................................................................................16 6.1.2 Timber laminations ............................................................................................................................16 6.1.3 Timber layers .......................................................................................................................................17 6.1.4 Wood-based panel layers .................................................................................................................17 6.1.5 Species .....................................................................................................................................................17 6.1.6 Adhesives ...............................................................................................................................................18 6.2 Product characteristics .....................................................................................................................18 6.2.1 General ....................................................................................................................................................18 6.2.2 Modulus of elasticity, bending strength, compressive strength, tensile strength and shear strength ......................................................................................................................................19 6.2.3 Bonding strength .................................................................................................................................22 6.2.4 Resistance to fire .................................................................................................................................23 6.2.5 Reaction to fire .....................................................................................................................................23 6.2.6 Dimensional stability .........................................................................................................................26 6.2.7 Emission of formaldehyde ...............................................................................................................26 6.2.8 Durability ...............................................................................................................................................27 7 Assessment and Verification of Constancy of Performance (AVCP) .................................28 7.1 General ....................................................................................................................................................28 7.2 Type testing ...........................................................................................................................................28 7.2.1 General ....................................................................................................................................................28 7.2.2 Test samples, testing and compliance criteria .........................................................................29 7.2.3 Test reports ...........................................................................................................................................36 7.2.4 Shared other party results ...............................................................................................................36 7.2.5 Cascading determination of the product type results ...........................................................36 7.3 Factory production control (FPC) .................................................................................................37 7.3.1 General ....................................................................................................................................................37 7.3.2 Requirements .......................................................................................................................................38 7.3.3 Product specific requirements .......................................................................................................47 7.3.4 Initial inspection of factory and of FPC .......................................................................................48 7.3.5 Continuous surveillance of FPC ......................................................................................................48 7.3.6 Procedure for modifications ...........................................................................................................48 8 Marking and labelling ........................................................................................................................49 oSIST prEN 16351:2019

prEN 16351:2018 (E) 3 Annex A (normative)

Delamination test of glue lines between layers ......................................... 50 A.1 Principle ................................................................................................................................................. 50 A.2 Apparatus .............................................................................................................................................. 50 A.3 Sampling and preparation of test pieces .................................................................................... 50 A.4 Procedures ............................................................................................................................................ 50 A.5 Results .................................................................................................................................................... 52 A.6 Test report ............................................................................................................................................ 53 Annex B (normative)

Tests with laminations with or without finger joints (including compliance criteria) .......................................................................................................................... 54 B.1 Sampling ................................................................................................................................................ 54 B.2 Testing .................................................................................................................................................... 54 B.3 Compliance criteria of finger joints in laminations ............................................................... 55 B.4 Report of tests with finger joints in laminations ..................................................................... 55 B.5 Tests with laminations without finger joints ........................................................................... 56 Annex C (normative)

Determination of strength, stiffness and density properties of cross laminated timber ................................................................................................................................ 57 C.1 General ................................................................................................................................................... 57 C.2 Characteristics determined by tests with out of plane loads.............................................. 61 C.3 Characteristics determined by tests with in-plane loads ..................................................... 65 Annex D (normative)

Measurement of moisture content ................................................................. 70 D.1 General ................................................................................................................................................... 70 D.2 Measurement of moisture content of boards during production ..................................... 70 D.3 Mean moisture content of cross laminated timber made from timber laminations .. 70 Annex E (normative)

Separation tests with finger joints in laminations produced with contact-free application of adhesive ........................................................................................... 71 Annex F (normative)

Minimum production requirements .............................................................. 72 F.1 Personnel ............................................................................................................................................... 72 F.2 Production and storage facilities .................................................................................................. 72 F.3 Equipment ............................................................................................................................................. 72 F.4 Finger joints in laminations ............................................................................................................ 73 F.5 Grooving of laminations ................................................................................................................... 77 F.6 Gaps between laminations .............................................................................................................. 77 F.7 Bonding of layers ................................................................................................................................ 78 F.8 Layup ....................................................................................................................................................... 79 F.9 Cross laminated timber with large finger joints ..................................................................... 81 F.10 Corrected sizes and moisture deformation factor .................................................................. 83 oSIST prEN 16351:2019

prEN 16351:2018 (E) 4 Annex ZA (informative)

Relationship between this European Standard and Regulation (EU) No. 305/2011 .......................................................................................................84 ZA.1 Scope and relevant characteristics ...............................................................................................84 ZA.2 System of Assessment and Verification of Constancy of Performance (AVCP) .............88 ZA.3 Assignment of AVCP tasks ................................................................................................................88 Bibliography ........................................................................................................................................................92

oSIST prEN 16351:2019

prEN 16351:2018 (E) 5 European foreword This document (prEN 16351:2018) has been prepared by Technical Committee CEN/TC 124 “Timber structures”, the secretariat of which is held by AFNOR. This document is currently submitted to the CEN Enquiry. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. For the relationship with Regulation No. 305/2011, see informative Annex ZA, which is an integral part of this document. This document will supersede EN 16351:2015. Compared to EN 16351:2015 the following changes have been made: — the scope is limited to cross laminated timber with or without non-structural edge-bonds produced according to the provisions given in this standard; — provisions for designation codes have been added; — 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 properties of cross laminated timber have been modified; — the standard has been adjusted to the latest templates. oSIST prEN 16351:2019

prEN 16351:2018 (E) 6 Introduction Figure 1 shows the relation of some harmonized 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 harmonized European Standards on structural timber products Cross laminated timber in accordance to this European Standard 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 European Standard. oSIST prEN 16351:2019

prEN 16351:2018 (E) 7 1 Scope This document sets out requirements regarding the performance of characteristics of the following types of cross laminated timber to be used 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. It also lays down procedures for assessment and verification of constancy of performance (AVPC) of characteristics and specifies marking and labelling of cross laminated timber. This document covers cross laminated timber of all three types of cross laminated timber: — manufactured according to this standard, 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 standard; — which may be made of layers made of different species having similar properties; — bonded with phenolic or aminoplastic or moisture curing one-component polyurethane or emulsion polymer isocyanate adhesives of adhesive type I according to the respective standard; — built up of at least three orthogonally bonded layers (at least two of them timber layers); — which may have, depending on the number of layers, adjacent layers bonded parallel to the grain; — made of timber layers which are made of strength graded timber according to EN 14081-1; — made of timber layers having nominal thicknesses between 6 mm (including) and 60 mm (including) depending on the layup; — made of timber layers — which may comprise non-structural edge bonds; and — have a mean gap width of less than or equal to 0,6 mm and a 90th percentile of the gap width of 2 mm; — having nominal overall thicknesses up to 500 mm. Additional provisions of this document apply for straight cross laminated timber comprising only timber layers and comprising large finger joints (type 2): — made from cross laminated timber pieces having the same cross-section and layup; oSIST prEN 16351:2019

prEN 16351:2018 (E) 8 — made from cross laminated timber pieces having nominal cross-sectional thicknesses from 51 mm (including) up to 345 mm (including) and nominal minimum thicknesses of the outer layers not less than 17 mm (including). — made from cross laminated timber pieces solely comprising timber layers; — made from plane cross laminated timber pieces; — with parallel x-axes of the jointed components; — with finger joints having a finger length of at least 45 mm and fingers which are visible at the two narrow sides of the components; — bonded with phenolic or aminoplastic or moisture curing one-component polyurethane adhesives of adhesive type I according to the respective standard. Additional provisions of this document apply for straight cross laminated timber comprising timber and wood-based panel layers but no large finger joints (type 3): — made of structural wood-based panels specified in this European standard; — made of one panel per layer and; — having thicknesses between 6 mm (including) and 45 mm (including); This document applies to cross laminated timber untreated or treated against biological attack. This document

does not cover: — cross laminated timber treated with fire retardants; — cross laminated timber which is produced from re-used timber or wood-based panels comprising re-used timber. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 301:2017, Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification and performance requirements EN 302-2, Adhesives for load-bearing timber structures - Test methods - Part 2: Determination of resistance to delamination EN 302-6, Adhesives for load-bearing timber structures - Test methods - Part 6: Determination of the minimum pressing time under referenced conditions EN 335, Durability of wood and wood-based products - Use classes: definitions, application to solid wood and wood-based products EN 350, Durability of wood and wood-based products - Testing and classification of the durability to biological agents of wood and wood-based materials EN 351-1, Durability of wood and wood-based products - Preservative-treated solid wood - Part 1: Classification of preservative penetration and retention oSIST prEN 16351:2019

prEN 16351:2018 (E) 9 EN 408:2010+A1:2012, Timber structures - Structural timber and glued laminated timber - Determination of some physical and mechanical properties EN 717-1, Wood-based panels - Determination of formaldehyde release - Part 1: Formaldehyde emission by the chamber method EN 789, Timber structures - Test methods - Determination of mechanical properties of wood based panels EN 1995-1-1, Eurocode 5: Design of timber structures - Part 1-1: General - Common rules and rules for buildings EN 12369-2, Wood-based panels - Characteristic values for structural design - Part 2: Plywood EN 13183-1, Moisture content of a piece of sawn timber - Part 1: Determination by oven dry method EN 13183-2, Moisture content of a piece of sawn timber - Part 2: Estimation by electrical resistance method EN 13183-3, Moisture content of a piece of sawn timber - Part 3: Estimation by capacitance method EN 13238, Reaction to fire tests for building products - Conditioning procedures and general rules for selection of substrates EN 13353, Solid wood panels (SWP) - Requirements EN 13501-1, Fire classification of construction products and building elements - Part 1: Classification using data from reaction to fire tests EN 13501-2, Fire classification of construction products and building elements - Part 2: Classification using data from fire resistance tests, excluding ventilation services EN 13823, Reaction to fire tests for building products - Building products excluding floorings exposed to the thermal attack by a single burning item EN 13986, Wood-based panels for use in construction - Characteristics, evaluation of conformity and marking EN 14080:2013, Timber structures - Glued laminated timber and glued solid timber - Requirements EN 14081-1, Timber structures - Strength graded structural timber with rectangular cross section - Part 1: General requirements

EN 14358, Timber structures - Calculation and verification of characteristic values EN 14374, Timber structures - Structural laminated veneer lumber - Requirements EN 15228:2009, Structural timber - Structural timber preservative treated against biological attack EN 15416-5, Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 5: Determination of minimum pressing time under referenced conditions EN 15425:2017, Adhesives - One component polyurethane (PUR) for load-bearing timber structures - Classification and performance requirements EN 16254:2013+A1:2016, Emulsion polymerized isocyanate (EPI) for load bearing timber structures - Classification and performance provisions oSIST prEN 16351:2019

prEN 16351:2018 (E) 10 EN ISO 9239-1, Reaction to fire tests for floorings - Part 1: Determination of the burning behaviour using a radiant heat source (ISO 9239-1) EN ISO 11925-2, Reaction to fire tests - Ignitability of products subjected to direct impingement of flame - Part 2: Single-flame source test (ISO 11925-2) 3 Terms and definitions For the purpose of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses:

IEC Electropedia: available at http://www.electropedia.org/

ISO Online browsing platform: available at http://www.iso.org/obp 3.1 actual size measured size of a cross laminated timber at a related measured/estimated moisture content 3.2 bonding strength structural effectiveness of adhesives between timber pieces when subjected to stresses 3.3 corrected size size of a cross laminated timber corrected by calculation from its actual size to its size at the reference moisture content 3.4 cross laminated timber structural timber consisting of at least three face-bonded layers which comprise solid timber laminations and may comprise wood-based panels, at least one layer orthogonally oriented to the two adjacent layers Note 1 to entry: See also Figure 2.

Key 1 plane of the element 2 wide face 3 narrow face 4 outer layer oSIST prEN 16351:2019

prEN 16351:2018 (E) 11 5 inner layer 6 lamination 7 finger joint in lamination 8 large finger joint 9 usually the length 10 usually the width bCL of a plate or height hCL of a beam

Figure 2 — Cross laminated timber 3.5 curved cross laminated timber cross laminated timber having a precamber greater than 1% of the respective span 3.6 edge bonds non-structural bonds between adjacent laminations within a timber layer 3.7 finger angle inclination

of each side of the fingers of a finger joint Note1 to entry: See Figure 3. 3.8 finger joint interlocking end joint formed by machining a number of similar, tapered, symmetrical fingers in the ends of timber components using a finger joint cutter and then bonded together Note 1 to entry: In this European Standard, the term finger joint is used for finger joints in laminations whereas finger joints between cross laminated timber are defined as large finger joints (see 3.12).

Key bcut tip width of the cutter bt tip width lj finger length lt tip gap p pitch

finger angle 1 tip base Figure 3 — Typical profile of a finger joint 3.9 finger length distance lj between the finger base and the tip of the finger, measured along the centre line of the finger oSIST prEN 16351:2019

prEN 16351:2018 (E) 12 Note 1 to entry: See Figure 3. 3.10 finished thickness thickness after planing 3.11 laminations part of a structural glued timber product consisting of one board or two or more finger-jointed boards 3.12 large finger joint finger joint through the full cross-sectional area of two cross laminated timber components Note 1 to entry: See Figure 4.

Figure 4 — Cross laminated timber with large finger joints 3.13 layup cross-sectional arrangement of timber layers or wood-based panel layers in which layers may be made of different species and may be assigned to different strength classes or technical classes 3.14 maximum delamination length largest delamination length in any single glue line measured around the circumference of the test piece 3.15 mean moisture content mean value of the moisture content of cross laminated timber calculated from at least two measurements Note 1 to entry: See D.3. 3.16 minimum mean density required mean density at reference moisture content, estimated as the weighted mean of the mean densities of the layers, if necessary Note 1 to entry: Minimum mean density is used for the classification of the reaction to fire. 3.17 nominal size size specified at the reference moisture content to which deviations are related 3.18 pitch distance between centres of adjacent finger tips Note 1 to entry: See Figure 3. oSIST prEN 16351:2019

prEN 16351:2018 (E) 13 3.19 ratio of resin to hardener proportion of resin to hardener by mass with the resin set at 100 parts 3.20 reduction factor ratio

between tip width and pitch Note 1 to entry: See Figure 3. 3.21 reference moisture content moisture content of 12 % at which nominal sizes are established 3.22 relative tip gap ratio e between tip gap and finger length Note 1 to entry: See Figure 3. 3.23 rolling shear shear stress for which both complementary stress components are perpendicular to the grain 3.24 solid wood failure wood failure which is invariably more than two cell layers away from the adhesive layer 3.25 timber layer layer made of timber laminations with or without edge bonds 3.26 tip gap distance tp between finger-tip and slot base in a bonded finger joint Note 1 to entry: See Figure 3. 3.27 tip width distance bt between finger faces, measured at the tip of the finger Note 1 to entry: See Figure 3. 3.28 total delamination length sum of delamination lengths of all glue lines measured around the circumference of the test piece 3.29 wood-based panels structural plywood and structural solid wood panels according to EN 13986 and structural LVL according to EN 14374 oSIST prEN 16351:2019

prEN 16351:2018 (E) 14 3.30 wood-based panel layer layer made of one type and technical class of wood-based panels 3.31 wood failure percentage percentage of the solid wood failure area in relation to the glued area before splitting 4 Symbols 4.1 Main symbols A area, in mm2; Aw area of wane, in mm2 (see Figure F.1); a size

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