Treatment of spruce species with preservatives for poles and their field performance : investigations of the treating characteristics and performance under subsequent service of eastern spruce preserved under plant conditions
There are a number of good fire retardant formulation now being used commercially by the wood products industry, including several formulations developed and patented by Forintek as well as a number of inorganic proprietary formulations that have been used for many years. To date, these formulations have been evaluated mainly on their ability to reduce flame spread and combustion and their leach resistance.
Various treated commodities and simulated commodities have been put in test by Forintek Canada Corp. and its predecessors the Western and Eastern Forest Products Laboratories. This report draws together performance data on sawn-wood commodities pressure treated with CCA and pays particular attention to the relationship between preservative penetration and commodity performance. Non-incised, hem-fir decking with penetrations close to the proposed CSA 080, 2 inch decking standard has remained sound after 7 and 10 years exposure in British Columbia. Material which did not come close to this standard showed early signs of decay. In contrast, non-incised, finger-jointed SPF lumber samles have remained sound, despite very shallow preservative penetration, after 10 years above-ground exposure, possibly due to very low decay hazard conditions. In Ontario non-incised landscape ties made from sawn red pine have performed well over five years in test; hovever, even CCA-treated aspen-poplar peeler cores have performed well over this short time period.