hello started a 32 x28 pole , frostline in va is 18 inches ,my footers are 24 -32 inches deep. 1 bag of 80 lb concrete then post then another 80lb concrete put in after footer sets.barn will be 10 ft tall then fill hole with gravel dirt, 12inch hole .think this will be ok as far a depth decided to fill holes with concrete because of depth.
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