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Sounds good unless...

Posted by Dodgeman on May 7th, 2001 01:40 PM
In reply to how much foundation insulation is needed with floor heating? by tom on May 5th, 2001 09:45 PM [Go to top of thread]

You are in northern NM in the mountains where the cold is extreme in the winter. Even in that case, I would think 2" of styrofoam (R10) would be good for under the slab towards the interior of the house. I would put 3 to 4 inches (R15 to R20) arount the perimeter if the winter temps get to -20 deg F.

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