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4"X8"= 32 sq in . . . 144 sq in per sq ft . . . 4.5 bricks per sq ft . . . 450 bricks cover 100 sq ft plus joint width and height
81 bricks.12 feet times 12 inches per foot = 144 inches.144 inches divided by 16 inches per brick = 9 bricks in length/width.9 bricks (length) times 9 bricks (width) = 81 bricks.
If you are using the red brick which are 4" x 8" you will need 4.5 bricks per square foot (just call it five.) 5 x 400 is 2000 bricks.
It depends on the size of the bricks and their orientation.
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