Reconsidering Rot-Resistant Framing Material

摘要

For 60 years or so, a compound called chromated copper arsenate (CCA) successfully protected structural lumber from the harmful effects of weather, bugs, and microbes. Eased off the consumer market at the end of 2003 due to concerns about its toxicity, CCA was replaced by two other compounds also rich in copper but without the arsenic or the chromium: alkaline copper quaternary (ACQ) and copper azole (CA). Now, nearly four years later, they remain the only residential choice for treated wood rated for ground contact.