Hi,
Looking for advice for wood posts on concrete interior slab. Do I need a moisture barrier below the posts?
It seems the common wisdom is to put a PT or redwood (here in CA) barrier between concrete and wood framing whenever wood contacts concrete. This seems wise to me when placed against exterior walls, but what about slab floors? I ask because assuming the slab is dry enough to put a wood floor on, why could I not put non rot-resistant wood directly against a slab?
In particular, this slab is actually not on grade, but on a suspended metal deck over a basement. So there will be no direct concrete to ground contact. Is there some hygroscopic property of concrete that it can pull enough moisture out of the air to cause wood to dry-rot?
I may just go get some copper sheet and put it down under the posts.
Thanks,
Chris
Replies
The only requirement is that you not have direct contact with the crete. Your points are seemingly valid, but your local BI can anser how valid.
you can isolate contact not just with PT but with metal, Vycor, mounting hardware, or buy sealing the end grain with FG resin or epoxy
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