2 cubic feet broken down to a 2inch thick layer would give up 12 square feet at 2inches thick as 2 cubic feet could be 2'L x 1'W x 1'D then if you reduce the depth to 2" then you get 2L x 1'W x 6 ( from 12/2 ) giving you a grand surface area of 12 sq feet a 2" thickness
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