See APA’ s guide to Service Classes and Use Classes. For maximum biological durability, both Service Classes and Use Classes must be considered when specifying US CE-marked panels . This guide helps you make the right selection.
‘Hazard classes’ have been replaced (see updated EN 335:2013) by Use Classes covering plywood and OSB. They will also cover LVL when the LVL standards have completed their current update. 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. They are determined by the moisture content of the panel corresponding to the environmental humidity and temperature during service.