I would never set a post in concrete for a building as I have found they tend to rot out because the concrete holds water around the post. For a deck it wouldn't matter so much but I personally would still not consider it. I live in northern NY and I have been told that if there are irregularities in the concrete surface that the frost can use them to push the pier up. As you said, the ground freezes from the top down so if the ground near the surface can freeze and grab hold of the pier then when the lower levels freeze and expand they can push the pier up, as I understand the theory. 4 feet should be safe as our frost line is officially 3 feet. Zach
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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