EN 16351:2021

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 layers made of different species;- 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;- made of timber laminations having a nominal width between 40 mm (including) and 300 mm (including);- 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 47 mm (including);- made of timber layers which may comprise edge bonds;- 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 large finger joints having a finger length of at least 45 mm and fingers which are visible at the two narrow sides of the components;- having large finger joints 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 document;- 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.It also lays down procedures for assessment and verification of constancy of performance (AVPC) of cross laminated timber.