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A roofing square covers an area of 100 square feet. A standard 4x8 sheet measures 32 square feet (4 feet x 8 feet). To determine how many 4x8 sheets are in a roofing square, divide 100 square feet by 32 square feet, which equals approximately 3.125 sheets. Therefore, you would need about 4 sheets of 4x8 to cover a roofing square, accounting for waste and cuts.
1980
20
4-ft x 8-ft = 32 square feet in each sheet400/32 = 121/2 sheets
Assuming it's 4x8 inches, then one brick = 1/3 feet * 2/3 feet, so the area of a brick is 2feet2/9. 120 feet2/(2feet2/9) = 540 bricks