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NEN-EN 16351

Timber structures - Cross laminated timber - Requirements

active, Most Current
Organization: NEN
Publication Date: 1 March 2021
Status: active
Page Count: 100
ICS Code (Plywood): 79.060.10
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 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 reused timber.

It also lays down procedures for assessment and verification of constancy of performance (AVPC) of cross laminated timber.

Document History

NEN-EN 16351
March 1, 2021
Timber structures - Cross laminated timber - Requirements
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...
November 1, 2018
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...
October 1, 2015
Timber structures - Cross laminated timber - Requirements
NEN-EN 16351 sets out provisions regarding the performance characteristics for straight and curved structural cross laminated timber (X-Lam) both without and with large finger joints as a material...
December 1, 2011
Timber structures - Cross laminated timber - Requirements
NEN-EN 16351 sets out provisions regarding the performance characteristics for straight and curved structural cross laminated timber (X-Lam) both without and with large finger joints as a material...

References

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