(11-19-2012, 01:32 PM)CC Solutions Wrote: Are we limiting the discussion to slab on grade concrete without a proper vapor retarder?
Or are we discussing elevated slabs and slabs with a proper vapor retarder?
And did the ACI statement you quoted refer to a specific scenario?
The discussion is only limited to concrete. A vapor barrier/retarder does not make concrete more or less permeable. Elevating a slab does not make it more or less permeable.