Quote:
Originally Posted by SIKSUKR
Very true however,Most basements are just that,in the basement and mostly below grade so the ground becomes your insulation.
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This is true with below grade but the heat loss above grade is tremedous. Any time you have a surface area gaps and voids of 5% cut your R value in half. So basically the heat is rushing to the uninsulated above grade portion at such an accelerated rate it doesn't matter what is going on below grade. Insulation to 1ft below grade is the most cost effective way of going about it. The only difference is when you have a rock wall foundation you want to bring the foam down to the floor to get the foundation air sealed preoperly.