Core TradesQuestion 156 of 700
A roof has a total surface area of 2,000 square feet. Adding a 15% allowance for waste, hips, and starter courses, how many roofing squares should be ordered?
a.20 squares
b.21.5 squares
c.25 squares
d.23 squares
Explanation
2,000 square feet equals 2,000 / 100 = 20 squares of net area. Adding 15% for waste: 20 x 1.15 = 23 squares. 20 squares ignores waste; 21.5 uses about 7.5% instead of 15%; 25 overstates the allowance.
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