Performance of Preservative Treated Parallel Strand Lumber in Marine Exposures.
IRG/WP 06-30407
J J Morrell, C S Love, P Merrick
The performance ACZA treated Douglas-fir and CCA southern pine parallel strand lumber (PSL) was studied in marine exposures in Florida or Oregon. While materials treated to retentions below the recommended levels for marine exposure were attacked in Oregon, properly treated panels of either species performed well. Panels treated with these same chemicals and exposed in Florida experienced attack regardless of retention, primarily due to attack by preservative tolerant pholads. Panels treated with either ACZA or CCA and creosote performed well at this site and would be the preferred treatment for sub-tropical conditions. The results indicate that preservative treated PSL will perform well in marine exposures.