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First I find cubic feet.
30x48 divided by 3 for 4 inches thick. 480 cubic feet
27 cubic feet make a cubic yard.
480 divided by 27=17.8
I'd order 18 yards but also tell the ready mix company what I was doing so I wouldn't waste money.

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14y ago
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Q: How many yards of concrate is needed in a 30x48 building?
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