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Originally Posted by cmac2012
It's a quick, easy, and generally substandard way to put in a quickie foundation. They're generally shaped like a pyramid with the top lopped off. About 12 to 16" square at the base, maybe 8 to 10" tall. The square part at the top might be around 6" square. Sometimes, a square piece of 2x6 is recessed into the top. Made of concrete, of course.
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Thanks. I didn't know that's what they were called. We have some of those. FWIW, at the place that gets a lot of snow, one was used to support part of an outside stairway. Last spring it was hanging about an inch in the air (roughly 8 years after it was put in place). I dug out a foot under and backfilled the hole with concrete. Other blocks used to support part of the deck have shown signs of sinking. At the place that doesn't get a lot of snow one has been in use to support an outside stairway for about 20 years and hasn’t moved a millimeter, far as I can tell.