Chemical redistribution in CCA-treated decking

It is hypothesized that minor amounts of mobile chromated copper arsenate (CCA) preservative components redistribute during weathering into exposed untreated checks preventing infection by spores of wood-rotting basidiomycetes. Leaching and migration of CCA in commercially treated boards were investigated. A steady loss of arsenic was detected, which correlated with weather conditions during exposure. The redistribution of mobile chemicals was confirmed, as substantial amounts of all CCA components were found at the exposed untreated checked surfaces. Copper was the primary chemical redistributed onto the checked surface exposed during service, although chromium and arsenic were also recorded.

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