replying to clint wood, Mark Hudson wrote:
Concrete is permeable. If it were not permeable you could sweep water off of
concrete and it would not appear wet. Especially most slab concrete because
it is air entrained to protect against freeze/thaw cycles and most slab
concrete is 3000 psi. Concrete can be non-permeable with the correct mix
design, but that is not usually the case for slabs. If concrete is
non-permeable why does the code require vapor barriers????

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