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Field Stake Performance of Parallel Strand Lumber Treated with Waterborne Copper Naphthenate
2008 - IRG/WP 08-40435
Wood and wood products have been considered a premium building material for residential and industrial structures for many centuries. More recently, structural composite lumber (SCL) products have played an increasing role in satisfying the needs of the building industry. However, both wood and wood composites are naturally biodegradable materials which require enhanced durability when used in certain applications. This paper summarizes in-ground test performance of the structural composite lumber product parallel strand lumber (PSL) protected with the wood preservative waterborne copper naphthenate (CuN-W). ACQ-C was used as a reference preservative. Using AWPA standardized testing under high deterioration hazard conditions, PSL field stakes manufactured from southern yellow pine and Douglas fir and treated with both preservatives have performed well against decay and subterranean termites. PSL manufactured from the diffuse-porous hardwood specie yellow poplar, was not sufficiently protected by either of preservative formulation.
G P Merrick, M H Freeman, J A Brient


Douglas-fir PSL Treated with Oilborne Copper Naphthenate – Treatment Experience & Efficacy
2014 - IRG/WP 14-40687
Treating characteristics, field stake efficacy and the results from treatment trials for oilborne copper naphthenate (CuNap) and Douglas-fir parallel strand lumber (PSL) are summarized in this paper. Treatment with a P9 Type-C based solution in laboratory tests showed full cross section penetration of large cross sections could be achieved. Commercial treatment trials using a P9 Type-A solution showed that AWPA Standards for penetration and retention of CuNap could be met and that the use of a steam conditioning step had no negative impact on product dimensions. The ability of oilborne copper naphthenate to protect Douglas-fir PSL is demonstrated with field stake test data conducted in Florida over 12 years of exposure.
G P Merrick