I live in a frost area (northern VT). I've had good luck building pole barns and sheds that don't move by using pyramid shaped posts. I make a form with plywood, make sure the bottom of them is below frost and the top is above grade, and fill them with concrete. I generally make the bottom about 18-24" square, tapering up to about 10" square on top. By making pyramid shaped forms, when the ground freezes and lifts (like it always does), it will lift away from the post. I've tried sono tubes, pressure treated posts with slippery covers on them, and a pipe within a pipe. Nothing I've tried works better than these pyramid shaped posts.

Corm

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