Under Oregon building codes, what is the maximum riser height allowed for residential stairs?
Correct Answer
B) 7.75 inches
Oregon building code limits residential stair risers to a maximum height of 7.75 inches.
Why This Is the Correct Answer
Oregon building code (based on IRC R311.7.5.1) sets the maximum riser height for residential stairs at 7-3/4 inches (7.75 inches). This dimension balances comfort, safety, and accessibility for typical residential use.
Why the Other Options Are Wrong
Option A: 8 inches
8 inches exceeds the Oregon maximum. While some older codes allowed 8-inch risers, the current Oregon residential code limits risers to 7.75 inches to reduce tripping and fall hazards.
Option C: 7.5 inches
7.5 inches is within the allowed range but is not the maximum — it is a more conservative (safer) measurement. The question asks for the maximum permitted, which is 7.75 inches.
Option D: 8.25 inches
8.25 inches exceeds both the Oregon maximum and the IRC standard. Risers at this height significantly increase fall risk and are not permitted in residential construction.
Memory Technique
Think '7-3/4 is alive' — residential risers must stay at or under 7.75 inches. Anything over feels like climbing a ladder, not stairs.
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