How thick should footers be in West TN in rocky hill soil? My width is going to be 12 inches but I can not find anywhere on the thickness required. And should those footers be below the frost line? Frostline here is 18 inches.
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Bottom of the footing must be below the frost line. Check your state building code.
Thickness & width will depend both the soil type AND what the state (or local) code requires. What it's supporting may also come into consideration - single story or more.