Is there a frost risk with underslab inslation?
I was talking with a fellow builder the other day and he asked me if I was worried about frost getting under my slab on grade houses because I use 2″ xps insulation under my slabs. I also install 2″ xps down four feet vertically along foundation walls. His thoughts were that heat loss from the house often keeps underslabs warmer and frost out.
I am in zone 6.
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