A modified bitumen roof assembly is proposed over tapered insulation. What minimum slope should be checked under the IBC roof-covering provisions?
Correct Answer
D) 1/4 unit vertical in 12 units horizontal
IBC modified-bitumen roof provisions use a 1/4:12 minimum slope. Other choices confuse membrane roofing with shingles, tile, or a steeper project-specific drainage target.
Why This Is the Correct Answer
IBC modified-bitumen roof provisions use a 1/4:12 minimum slope. Other choices confuse membrane roofing with shingles, tile, or a steeper project-specific drainage target.
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