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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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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