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Depends on how thick the slab is, but 4" thick (.33 or 1/3 of a foot thick) would be typical. So multiply 10 x 10 = 100 square feet of area times .33(thickness in feet) equals 33 cubic feet. A 90 lb. bag contains about .66(two thirds) of a cubic foot of concrete, so you would need about 1 1/2 bags per cubic foot or 50 bags for 10'x10'x4"

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13y ago
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Q: How many bags of concrete to pour 10 foot by 10 foot space?
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