Reply by Matt Rogers

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Posted on Is treated lumber safe to use for indoor projects?

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Matt Rogers

110 posts in 2424 days

#1 posted 09-12-2017 01:15 AM

Pressure treated lumber today is fine for interior framing. Think about a slab on grade foundation – every wall will have a sill plate that must be pressure treated. Same for a finished basement – the exterior wall framing in contact with masonry must be pressure treated. So most houses already have some small amount of PT framing lumber inside. The new PT treatments are mostly copper based and should be fine in any application where they are covered by plywood, sheetrock, or not in direct contact with your skin.

I don’t think that you can find any CCA (chromated copper arsenic) lumber outside of some specialized marine application where they get to use much nastier stuff than anywhere else. Of course, there is old lumber still around, but new stuff should be fine.

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