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I made a 10x12 shed. I used my tractor to dig out about a foot down where I got to pretty well consolidated DG. I put down piers with the 4 in. wide hardware on top. I used 4x4, pressure treated posts for the sub floor and put 2x4's on top spaced at about a foot. Then over that I laid down my plywood floor. If you have frost down to 42", I'd sink those cardboard tubes you can buy at a place like H.D. (maybe 12" dia.) to a little deeper than that and pour them full of concrete and put a mounting hardware into the top of the concrete. I did 12 piers (three rows of four). How many you put in would be your decision.
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Marv Evans
'69 911E
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