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LVL Durability and Use Classes

LVL Durability and Use Classes for Different Moisture Environments

Hazard Classes have now been replaced by Use Classes (see updated EN 335:2013) but are currently only listed for plywood and OSB.  APA plywood is suitable for classes 1-3 and these are also applicable for LVL.  Specific LVL Use Classes will be available when the current review of LVL standards is  completed.  Click here for a full list.

For maximum biological durability, both Service Classes and Use Classes must be considered when specifying US wood-based panels. APA has produced this guide to help you align Use Classes and Service Classes.  Also see plywood Use Class definitions in EN 636:2012+A1:2015.

Use Classes are based on different environmental exposures that can make the panel susceptible to deterioration. , as given in Eurocode 5, are used for assigning  strength values and calculating deformation in load bearing situations.

DDCEN/TS 1099 also provides info on factors affecting durability  and the relevant biological durability clauses in EN 14279:2004 – Laminated Veneer Lumber (LVL) – Definitions, classification and specification are: 5.3.2, 5.4.2 and 5.5.2.