HI, my name is Joe and I am about to start my pizza oven build. I live in Canada, Mississauga to be exact just outside of Toronto. Frost is a big concern here because of our winters and I really don't want to dig four feet if I don't have to. I'd like to dig 16" trenches around the perimeter along with 6 to 8 - 8" sono tubes about 4' down. I'm putting down gravel, 6mil poly and mybe some 2" foam. My question is this has anyone ever put a 3 to 4" layer of the vermiculite and cement mixture before the 5.5" foundation slab? Your thouhts would be appreciated. This site is amazing and has already answered a 100 questions that I didn't have to ask.
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