What is pressure treated lumber treated with?

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asked May 8, 2018 in Do it yourself by riplstripe (380 points)
What is pressure treated lumber treated with?

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answered May 12, 2018 by Essmann (42,860 points)
Pressure treated lumber is treated with arsenic, Chromium.

That is mainly for pressure treated lumber used in commercial applications though and residential pressure treated lumber is usually treated with copper based pesticides.

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