Last been told by builder to put 18 inches 100 yards down for the base, plus I will need another 75 yards for to fill the center. This is for a 20,000 bushel bin. How much are others doing? My worry is if I don't do it and the concrete falls apart they will be able to blame it on the lack of gravel.
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how much gravel to put under a bin for a base?
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