A cedar wood shingle roof is shown on a small entry roof. What minimum slope should be checked under the IBC wood-shingle provisions?
Correct Answer
D) 3:12, the wood-shingle minimum
IBC wood-shingle provisions use a 3:12 minimum slope. Other choices are membrane, asphalt-shingle, or slate-style slope values rather than the wood-shingle minimum.
Why This Is the Correct Answer
IBC wood-shingle provisions use a 3:12 minimum slope. Other choices are membrane, asphalt-shingle, or slate-style slope values rather than the wood-shingle minimum.
Why the Other Options Are Wrong
Option A: 1/4:12, the low-slope membrane-roof value
Choice A gives 1/4:12, the low-slope membrane-roof value. Its specific error: 1/4:12, the low-slope membrane-roof value is an IBC dimensional value for a different stair, door, or egress condition.
Option B: 2:12, the asphalt-shingle minimum
Choice B (2:12, the asphalt-shingle minimum) is rejected because 2:12, the asphalt-shingle minimum is an IBC dimensional value for a different stair, door, or egress condition.
Option C: 4:12, the slate-shingle value
In thermal and moisture protection, 4:12, the slate-shingle value is the wrong selection for Wood shingle slope: 4:12, the slate-shingle value is an IBC dimensional value for a different stair, door, or egress condition.
Memory Technique
Treat wood shingle slope like a labeled shelf; only the matching condition belongs with 3:12, the wood-shingle minimum.
Reference Hint
Open International Building Code 2021 or 2024; use IBC 2021/2024 Section 1507 wood shingles - slope to confirm that IBC wood-shingle provisions use a 3:12 minimum slope.
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