Since the early 1930s, the most widely used chemical treatment
for treated wood has been chromated copper arsenate (CCA)
compounds. CCA-treated wood has proved to perform successfully in
many applications, including as roof assembly components.
As of January 2004, wood preservers voluntarily removed
CCA-treated wood from U.S. and Canadian consumer markets as a
result of an agreement with the U.S. Environmental Protection
Agency (EPA). EPA cited the arsenic and chromium contained in the
CCA treatment as being possible environmental concerns when used in
certain outdoor applications, such as furniture and...
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