Quote:
Originally Posted by S-F
The concern I was stating about moisture didn't have anything to do with drainage issues. Of course you MUST sort that stuff out first. Any living environment will produce moisture. Where's it going to turn back into a liquid as it moves through the wall? If there is a vapor impermeable layer on both sides (foam and concrete) the moisture will be trapped there and things will go south. R - 15 on the outside of a foundation may perform like R 40 above grade. I don't know. It certainly isn't fixed though. Soil temperatures change with the seasons.
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The house has and will have vapor barriers on the exterior, but why would I put a vapor barrier on the interior?