 Re: Hello from Ames, Iowa, US
Local code here for poured footings is 48" below grade. I had thought of doing post-hole footings at the corners of the slab. The builder I talked to seemed to think that the foam, with good drainage beneath it, would actually do a better job of preventing heave.
I guess the other question is the one that should come first: How serious a concern is frost heave? I have nightmare images of a cracked slab, with the cracks going right on up the oven, but maybe that's just an overactive imagination.
-Ed |