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How Much Does A Yard Of Concrete Cover If It Is 4 Inches Thick?

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Larry Patterson answered
A cy is 27 cubic feet. If you divide 27 by 0.33 (4 inches in feet).

The result is 81.8 square feet. Any shape (volume) of 81.8 sf, 4 inches deep could be filled with 1 cy of concrete.

For example, 1 foot by 81.8 feet. Or 2 feet by 40.9 ft. Or the square root of 81.8 is about 9.
So 9 x 9 x 0,33 rounded off is 27 cubic feet

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