Core TradesQuestion 153 of 700
A simple gable roof has two identical planes, each measuring 40 ft along the ridge by 18 ft up the slope. How many roofing squares of material cover the roof (before waste)?
a.12 squares
b.18 squares
c.14.4 squares
d.21.6 squares
Explanation
Each plane is 40 x 18 = 720 square feet; two planes total 1,440 square feet. One roofing square equals 100 square feet, so 1,440 / 100 = 14.4 squares. 12 and 21.6 come from counting one plane or mis-multiplying; the calculation must use the sloped dimension, not the flat footprint.
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