Treated Wood Susceptible to Rot, Says Study
A study published in
Forest Products Journal in June 2007 found that wood treated with copper azole or alkaline copper quaternary compound (ACQ) to both above-ground and ground-contact levels is prone to damage from brown-rot fungi. Both chemicals were introduced to replace chromated copper arsenate for residential use several years ago (see
) and together are the current industry standard. Test samples treated with both chemicals lost 20%–60% of their mass due to rot; the study concludes that wood treated to current standards may not be adequately protected. While gathering samples for the study, researchers found that wood treated to higher-retention ground-contact levels was not available at many lumberyards, suggesting that many consumers are using lower retention treated wood in ground-contact applications, creating even greater risk for rot.
Published August 2, 2007