A wood-framed egress stair is laid out under the IBC commercial stair provisions. What maximum riser height applies before considering special exceptions?
Correct Answer
A) 7 in.
IBC 1011.5.2 generally limits stair riser height to 7 in. for egress stairs before listed exceptions. Other choices are residential-style or nonmatching values.
Why This Is the Correct Answer
IBC 1011.5.2 generally limits stair riser height to 7 in. for egress stairs before listed exceptions. Other choices are residential-style or nonmatching values.
Why the Other Options Are Wrong
Option B: 7-3/4 in.
Choice B gives 7-3/4 in. Its specific error: 7-3/4 in. is an IBC dimensional value for a different stair, door, or egress condition.
Option C: 8 in.
Choice C (8 in.) is rejected because 8 in. is an IBC dimensional value for a different stair, door, or egress condition.
Option D: 6 in.
In wood framing, 6 in. is the wrong selection for Egress stair risers: 6 in. is an IBC dimensional value for a different stair, door, or egress condition.
Memory Technique
Link egress stair risers to its book condition; a different condition means a different answer than 7 in.
Reference Hint
Open International Building Code 2021 or 2024; use IBC 2021/2024 Section 1011.5.2 riser height to confirm that IBC 1011.5.2 generally limits stair riser height to 7 in.
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