Durability of reaction to fire – performance: Classes of fire-retardant treated wood-based products in interior and exterior end use applications (NT FIRE 054)

Abstract

  This document prescribes the classification requirements for the durability of the reaction to fire performance of fire-retardant treated wood-based products to be used in interior and/or exterior end use conditions. The products must initially meet required reaction to fire classification. In addition, the products must meet the minimum durability of reaction to fire performance requirements specific to the end use. For interior use, limited hygroscopicity has to be verified. For exterior use, the reaction to fire performance level has to be maintained after accelerated or natural weathering. This document may be used as a basis for an approval system.