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The attached pic shows a plan of my yet-to-be-built foundation. Note the three spread footings in the interior of the house area (the other area to the lower left is the storage and shop area under the garage). Must these go way down deep, as deep as the frost walls all along those upper perimeters? Or can their tops be just under the base gravel and foam we’ll put under the floor slabs? Logic tells me that the area under the warm house is frost-protected, and we do not have to go deep, as long as the bases of these footings are on undisturbed soil.
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The attached pic shows a plan of my yet-to-be-built foundation. Note the three spread footings in the interior of the house area (the other area to the lower left is the storage and shop area under the garage). Must these go way down deep, as deep as the frost walls all along those upper perimeters? Or can their tops be just under the base gravel and foam we'll put under the floor slabs? Logic tells me that the area under the warm house is frost-protected, and we do not have to go deep, as long as the bases of these footings are on undisturbed soil.