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Conversions Table. 1 Roofing Squares to Square Feet = 100. 70 Roofing Squares to Square Feet = 7000. 2 Roofing Squares to Square Feet = 200. 80 Roofing Squares to Square Feet = 8000.
Multiply the square footage of your roof by .1 to get the 10 percent waste allowance. To conclude the example, if your total roofing area is 17,300 square feet, your waste allowance would be 17,300 x .1 = 1,730 square feet. The total amount of roofing material you need is 17,300 + 1,730 = 19,030 square feet.