ÖNORM EN 16351

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.