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A concrete block is 18 inches long and 8 inches high. Therefore, about 6 block for each side = 9 feet 6 inches, with the end block of the next side turned sideways. 4 sides X 6 block is 24 block per course and where I live I would need at least 6 coarses below grade for a total of 144. I would get 10% extra just in case which would make it 158. You would have to add to this for any height above grade.

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∙ 14y ago

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