Are the wood treatment wars over?
from Deck Magazine
The withdrawal in 2004 of chromated copper arsenate from the residential treated-wood market led to a spate of new preservatives such as ammoniacal copper quat and copper azole. Both of those chemicals rely on higher concentrations of copper to pick up the slack left by the absence of chromium and arsenic. While both ACQ and CA are effective preservatives, they are also more corrosive than CCA. Briefly, copper eats steel and aluminum for lunch, and one of the benefits of the now-missing arsenic and chromium was that they made the copper less corrosive. This one-two combination caught a lot of deck builders and hardware manufacturers short, and before long, deck builders were talking about little other than failing flashing, fasteners, and hardware.
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