Marine borer degradation of treated and untreated parallel strand lumber panels
Published: 2007
Publication Name: Forest products journal
Publication URL: https://agris.fao.org/agris-search/search.do?recordID=US201300768868
Abstract:
Southern pine and Douglas-fir parallel strand lumber (PSL) panels were treated with chromated copper arsenate (CCA) or ammoniacal copper zinc arsenate (ACZA), respectively, and exposed in a marine environment in Massachusetts for 7 years. Untreated PSL was also tested and performed well in comparison to untreated solid pine wood and displayed no delamination. Treatment with 16 kg/m3 (1 pcf) or greater of either wood preservative provided adequate protection of the panels. ACZA treated samples displayed significant mass losses over the 7-year exposure period even though no marine borer attack of the higher retention samples occurred. Internal and external evaluation of the samples after 7 years indicated that external evaluation accurately estimated the conditions inside the samples when limited degradation was present. However, as degradation progressed, the data suggest that internal degradation may be more extensive than indicated by the external ratings, at least when shipworm damage was most prevalent. Overall, the PSL panels performed very well in the marine environment when treated with appropriate levels of preservative.