ČSN EN 16351-ed.2 (732832)

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Anotácia textu normy ČSN EN 16351-ed.2 (732832):

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