if you hit clay you need to use bigfoots niko, or at least last I knew, and unless you hit and unmovable boulder they need to be at least 4' you building at your house?
Definately use bigfoots. You will not be sorry later. Especially if you close it in and heat it later. 4 ft. is code, but the extra support from the bigfoot will not allow any movement later. Especially on clay.
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