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 - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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