Framing & StructuralQuestion 396 of 700
A stair must rise a total of 108 inches from finished floor to finished floor. If each riser is designed at 7.2 inches, how many risers are required?
a.12 risers
b.14 risers
c.15 risers
d.18 risers
Explanation
Number of risers equals total rise divided by riser height: 108 / 7.2 = 15 risers exactly. 12 risers would give a 9-inch riser (too tall); 14 risers gives about 7.7 inches (acceptable but not the designed 7.2); 18 risers gives only 6 inches, more than designed.
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