Framing & StructuralQuestion 403 of 700
On a residential stairway, the MAXIMUM allowable variation between the largest and smallest riser height within a single flight is generally limited to what value?
a.1/8 inch
b.3/8 inch
c.3/4 inch
d.1 inch
Explanation
Uniformity rules limit the difference between the largest and smallest riser (and largest and smallest tread) in a flight to no more than 3/8 inch, preventing trip hazards from uneven steps. 1/8 inch is stricter than required, while 3/4 inch and 1 inch exceed the limit and create dangerous inconsistency.
Law Reference: 2025 CA Residential Code §R311.7.5.3Practice all 700 questions free — no signup required.
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