Framing & StructuralQuestion 367 of 700
CALCULATION: A stairway must rise a total of 112 inches from finished floor to finished floor. Using the 7-3/4 inch maximum riser height, what is the MINIMUM number of risers required?
a.13 risers
b.14 risers
c.15 risers
d.16 risers
Explanation
Divide total rise by the maximum riser: 112 / 7.75 = 14.45, which must round UP to 15 risers so each riser stays at or below 7-3/4 inch (112 / 15 = 7.47 inch). Thirteen or fourteen risers would exceed the maximum height, and 16 is more than the minimum needed.
Law Reference: 2025 CA Residential Code §R311.7.5.1Practice all 700 questions free — no signup required.
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