Framing & StructuralQuestion 460 of 700
A roof rises 3 inches for every 12 inches of horizontal run. Expressed as a percentage, what is the slope of this roof?
a.25 percent
b.33 percent
c.3 percent
d.12 percent
Explanation
Percent slope equals rise divided by run times 100: (3 / 12) x 100 = 25 percent. Thirty-three percent would be a 4:12 slope, 3 percent and 12 percent come from misreading the rise-over-run ratio.
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