CEN/TC 124/WG 3 - Glued laminated timber

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.

This European Standard sets out provisions regarding the performance characteristics for structural finger jointed timber with rectangular cross section for use in buildings and bridges.
The use of structural finger jointed timber may be limited to certain service classes in some member states.
It also lays down minimum production provisions and procedures for Assessment and Verification of Constancy of Performance for structural finger jointed timber.
This European Standard is applicable to structural finger jointed timber made of coniferous timber species listed in this standard or poplar.
Although it may be possible to produce structural finger jointed timber made from specific broadleaf species based on some provisions of this European Standard, this standard is not applicable to these products.
This European Standard is only applicable to finger joints between timber sections of the same species.
This European Standard does not cover impressed (die-formed) finger joints.
This European Standard covers structural finger jointed timber untreated or treated against biological attack. Structural finger jointed timber treated with fire retardants is not covered.

This European Standard sets the performance requirements of the following glued laminated products:
-   Glued laminated timber (glulam);
-   Glued solid timber;
-   Glulam with large finger joints;
-   Block glued glulam
for use in buildings and bridges.
It also lays down minimum production requirements, provisions for evaluation and attestation of conformity and marking of glued laminated products.
This European Standard is applicable for glued laminated timber made of coniferous species listed in this standard or poplar consisting of two or more laminations having a thickness from 6 mm up to 45 mm (inclusive).
It may be possible to produce glulam made from specific hardwood species based on some provisions of this European Standard. In this case, Annex ZA does not apply.
This European Standard is applicable for glued solid timber made of coniferous species listed in this standard or poplar consisting of two to five laminations having a thickness greater than 45 mm and less than or equal to 85 mm.
This European Standard is applicable for large finger joints in glued laminated timber with a finger length of at least 45 mm.
This European Standard is applicable for block glued glulam having solid rectangular cross sections.
This European Standard also gives the requirements for glued laminated products treated against biological attack. Glued laminated products treated with fire retardants are not covered.

This document specifies the requirements for laminated veneer lumber for structural applications. The tests to be used, methods to carry out the evaluation of conformity and content of the marking of the product are given.
This document does not cover laminated veneer lumber treated against biological attack or fire.

This European Standard specifies the requirements for glued laminated timber for use in load bearing structures. It also specifies the requirements for large finger joints in the glued laminated timber. This European Standard specifies the requirements for glued laminated timber produced from untreated timber or from timber treated against biological attack.

This document sets out requirements regarding the performance of characteristics of the following Types of laminated veneer lumber (LVL):
-   Type 1: LVL for structural applications in buildings and bridges in dry, humid and exterior conditions;
-   Type 2: Multiple glued LVL for structural applications in buildings and bridges in dry, humid and exterior conditions;
-   Type 3: LVL for non-structural internal and external applications in construction.
This document covers laminated veneer lumber of all Types:
-   made of at least five veneers having a maximum veneer thickness of 6 mm;
-   which may comprise veneers made from different species;
-   solely made of parallel veneers or symmetrically build up with at least two crossband veneers.
This document also covers multiple glued LVL (Type 2) which is produced by face gluing several panels according to this standard.
This document covers laminated veneer lumber of any Type being either preservative treated or untreated against biological attack or treated to improve the reaction to fire performance.
This document also lays down procedures for assessment and verification of constancy of performance (AVCP) and specifies marking and labelling of laminated veneer lumber.
This document does not cover laminated veneer lumber which is produced from re-used timber.

This European Standard 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 for the manufacture of structural elements to be used in buildings and bridges.
This European Standard applies to cross laminated timber:
-   to be used in service class 1 or 2 according to EN 1995 1 1;
-   made of coniferous species and poplar listed in 5.1.5 of this standard;
-   built up of at least three orthogonally bonded layers (at least two of them timber layers);
-   having, depending on the number of layers, adjacent layers which may be 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 thicknesses between 6 mm and 60 mm (including) taking into account the layup requirements given in this European standard;
-   made of timber layers which may be edge bonded or which are not bonded and have spacing less than 6 mm between adjacent laminations;
-   which may comprise wood based panel layers made of structural wood based panels specified in this European standard, fulfilling the requirements for use in service class 2 or 3 according to EN 1995 1 1, having no structural joints between the single panels and having thicknesses between 6 mm and 45 mm (including);
-   bonded with adhesives, fulfilling the requirements given in this European standard;
-   having overall thicknesses up to 500 mm;
-   which is not made from reused timber or wood based panels comprising reused timber.
This European Standard also applies to cross laminated timber with large finger joints:
-   made from cross laminated timber pieces having the same cross section and layup;
-   made from cross laminated timber pieces having cross sectional thicknesses from 51 mm up to 345 mm (inclusive) and minimum thicknesses of the outermost layers not less than 17 mm.
-   made from cross laminated timber pieces solely comprising timber layers;
-   made from plane cross laminated timber pieces jointed so that no regular change between the grain directions of the layers occurs;
-   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.
This European Standard applies to cross laminated timber treated against biological attack. Cross laminated timber treated with fire retardants is not covered.
It also sets out minimum production requirements and procedures for Assessment and Verification of Constancy of Performance.

This European Standard specifies the requirements for glued laminated timber for use in load bearing structures.
It also specifies the requirements for large finger joints in the glued laminated timber.
This European Standard specifies the requirements for glued laminated timber produced from untreated timber or from timber treated against biological attack.

This standard specifies requirements for the components of glued laminated timber structures members and minimum requirements for the production of such members for structural use.
This standard is applicable to products with a finished lamination thickness of not more than 45 mm.
Although most glued laminated timber is made from coniferous species this standard also applies to broad leaved species if information is available to enable them to be satisfactorily bonded.

This standard specifies requirements for bonded finger joints and minimum requirements for the manufacture of cut, interlocking, bonded finger joints in structural timber members. Requirements are given for timber, adhesive, moisture content, cutting and bonding.
This standard is only applicable to finger joints between timber members of the same species type.
Although most finger joints are produced in coniferous species this standard also applies to broad-leaved species where information is available to enable them to be satisfactorily bonded.
It does not cover impressed (die-formed) joints. In the case of glued laminated timber it applies only to individual laminations. Large finger joints in glued laminated timber are covered by EN 387.
NOTE   This standard is elaborated as a supporting standard for a harmononized standard on structural timber with finger joints to be published in the future.

This standard specifies requirements for large finger joints and minimum requirements for the production of these in structural members of glued laminated timber also with corner pieces of laminated veneer lumber or plywood with a finger length of at least 45 mm. The glued laminated timber and the laminated veneer lumber shall be made from conifers and poplar. Such finger joints may be employed for joints in straight beams or for frame corners, see Figure 1.

This standard describes a method for measuring the shear strength of the glue line parallel to the direction of grain. The standard is applicable in the fieldof continuous quality control of the glue line.

This standard specifies tolerances on sizes of glued laminated timber for structural use and the reference moisture content at which sizes are established. It also gives a method for the calculation of corrected sizes for glued laminated timber with a moisture content deviation from that of the reference moisture content. It is applicable to glued laminated timber with rectangular cross sections having sizes in the range of: width: 50 mm to 300 mm,depth: 100 mm to 2500 mm.

This prestandard specifies requirements for large finger joints and minimum requirements for the production of these in structural members of glued laminated timber made from coniferous wood. Such finger joints may be employed for joints in straight beams or for frame corners, see figure 1.

This standard specifies in part requirements for the components of glued laminated timber members, in part minimum requirements for the production of such members for structural use. The standard is applicable to products with a finished lamination thickness of not more than 45 mm. Although most glued laminated timber is made from coniferous species this standard also applies to broad leaved species if information is available to enable them to be satisfactily bonded.

This standard specifies requirements for bonded finger joints and minimum requirements for the manufacture of cut, interlocking, bonded finger joints in structural timber members. Requirements are given for timber, adhesive, moisturecontent, cutting, bonding and preservative treatments and flame retardant treatments. This standard is only applicable to finger joints between timber members of the same species type.

This standard specifies three delamination methods for continuous quality control of the glue line integrity of glued laminated timber.