Framing & StructuralQuestion 456 of 700
A roof is designed with a 4:12 slope (4 inches of vertical rise for every 12 inches of horizontal run). If the horizontal run from the wall to the ridge is 15 feet, what is the total vertical rise?
a.3 feet
b.4 feet
c.5 feet
d.6 feet
Explanation
Rise equals run times the slope ratio: 15 feet x (4/12) = 15 x 0.333 = 5 feet. The other answers come from applying the wrong ratio or misplacing the run and rise in the slope fraction.
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