After speaking with several people, including local building inspectors (less than helpful), it seems that in this part of Michigan, a foundation needs to extend 42 inches deep to get below the frost line. I've gotten variable responses about the best way to proceed with the foundation. Several have suggested the need to dig below the frost-line for the perimeter of the slab. This seems to be the safest bet. I plan to dig down (that's almost 4 feet!) the entire perimeter of the foundation, then tie the foundation into the concrete slab with rebar. I'd like to do the whole thing with one pour.

Does anyone have a photo of this deep of a foundation? I found one from thebadger (thank you), however his foundation is of block. If I'm pouring the slab, would it be easier to pour the whole thing? How much concrete is this going to require?

thanks

Does anyone have a photo of this deep of a foundation? I found one from thebadger (thank you), however his foundation is of block. If I'm pouring the slab, would it be easier to pour the whole thing? How much concrete is this going to require?

thanks

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