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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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