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It has 2 inches of foam underneath the slab. The center of the slab is 6 inches thick.
Alan,It was a monolithic slab. 12 inches down and 12 inches wide. The DNR didn't want me to dig so we did a floating slab. Why?Toyotaboy
Monolithis slab covers that nicely; that's what we call them in NM. That's what we have under our home, 18" deep around the perimeter footing portion. Ours is 27 years old. Back then no insulation was used at all. The thing that is probably most confusing is how it "works" in a cold climate where the ground can freeze deeper than the depth of the perimeter. I have not bothered to do any research on that. I do know there are ways of using a prescribed amount of dense rigid foam under the slab to make a shallow frost free foundation; different methods for permanently heated and non heated or occasionally heated buildings, I believe.
And how are you handling your water and plumbing now that your slab is poured?interesting build, thanks for sharing with us.
Wetlands are a PITA, aren't they.