A natural slate roof is detailed over wood decking. What minimum slope is generally listed for slate shingles in the IBC roof-covering provisions?
Correct Answer
C) 4:12, the slate-shingle minimum
IBC slate-shingle provisions generally use a 4:12 minimum slope. Other choices belong to asphalt, wood shingles, or low-slope membrane assemblies.
Why This Is the Correct Answer
IBC slate-shingle provisions generally use a 4:12 minimum slope. Other choices belong to asphalt, wood shingles, or low-slope membrane assemblies.
Why the Other Options Are Wrong
Option A: 2:12, the asphalt-shingle minimum
Choice A (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 B: 3:12, the wood-shingle value
In thermal and moisture protection, 3:12, the wood-shingle value is the wrong selection for Slate shingle slope: 3:12, the wood-shingle value is an IBC dimensional value for a different stair, door, or egress condition.
Option D: 1/4:12, a membrane-roof slope
Choice D gives 1/4:12, a membrane-roof slope. Its specific error: 1/4:12, a membrane-roof slope is an IBC dimensional value for a different stair, door, or egress condition.
Memory Technique
File slate shingle slope under a anchor: condition first, number or duty second, answer 4:12, the slate-shingle minimum.
Reference Hint
Open International Building Code 2021 or 2024; use IBC 2021/2024 Section 1507 slate shingles - slope to confirm that IBC slate-shingle provisions generally use a 4:12 minimum slope.
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A reroof area requires 14,720 sf of rigid insulation. Boards are 4 ft by 8 ft, and the order includes 5 percent waste. How many boards are needed?