Planning & EstimatingQuestion 534 of 700
An interior stair must connect two floors with a total floor-to-floor height of 108 inches. If the code limits each riser to a MAXIMUM of 7.75 inches, what is the MINIMUM number of risers required?
a.12 risers
b.13 risers
c.15 risers
d.14 risers
Explanation
Minimum risers = total rise divided by maximum allowed riser height = 108 / 7.75 = 13.9. Because you cannot have a partial riser and going below the count would exceed the maximum height, you round UP to 14 risers. With 14 risers each is 108 / 14 = 7.71 in, which is within the limit. With 13 risers each would be 8.31 in, exceeding 7.75 in. Options a and b give risers that are too tall; option c adds an unnecessary riser. Round the count up so each riser stays at or below the maximum.
Law Reference: 2025 California Residential Code §R311.7.5Practice all 700 questions free — no signup required.
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