Thread: Treated lumber?
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Old May 9, 2016   #23
Cole_Robbie's Avatar
Join Date: Jun 2012
Location: Illinois, zone 6
Posts: 8,288

The new treated lumber used today contains arsenate, instead of arsenic. It is less toxic. It is also highly corrosive to greenhouse plastic. Treated lumber needs to be painted before touching poly.

I read that with the old stuff, root crops grown in pure treated lumber sawdust would get slightly above the government safety threshold, but only on the very tip of the radish or carrot, the part that a person would not eat.
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