0
12 inches = 1 foot
1 cubic yard = 27 cubic feet
9 inches = 0.75 foot
15 x 8 x 0.75 = 90 cubic ft = 3 and 1/3 cubic yards
I've never ordered concrete. but I suspect they'll charge you for 4 .
Cost for 3-1/3 = $100
Cost for 4 = $120
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∙ 14y ago
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You need to specify the slab's width and the length as well.
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