A thermoset single-ply roof membrane is selected for a large low-slope roof. What minimum slope does the IBC list for that roof covering?
Correct Answer
A) 1/4 unit vertical in 12 units horizontal
IBC thermoset single-ply membrane roof provisions use a 1/4:12 minimum slope. Other choices are steeper values associated with other roof-covering types or project preferences.
Why This Is the Correct Answer
IBC thermoset single-ply membrane roof provisions use a 1/4:12 minimum slope. Other choices are steeper values associated with other roof-covering types or project preferences.
Why the Other Options Are Wrong
Option B: 1 unit vertical in 12 units horizontal
Choice B (1 unit vertical in 12 units horizontal) is rejected because 1 unit vertical in 12 units horizontal is an IBC dimensional value for a different stair, door, or egress condition.
Option C: 2 units vertical in 12 units horizontal
In thermal and moisture protection, 2 units vertical in 12 units horizontal is the wrong selection for Thermoset membrane slope: 2 units vertical in 12 units horizontal is an IBC dimensional value for a different stair, door, or egress condition.
Option D: Use 4 units vertical in 12 units horizontal as the thermoset membrane slope threshold
The trap in D is 4 units vertical in 12 units horizontal. That selection is wrong because 4 units vertical in 12 units horizontal is an IBC dimensional value for a different stair, door, or egress condition.
Memory Technique
File thermoset membrane slope under a badge: condition first, number or duty second, answer 1/4 unit vertical in 12 units horizontal.
Reference Hint
Open International Building Code 2021 or 2024; use IBC 2021/2024 Section 1507 thermoset single-ply roofs - slope to confirm that IBC thermoset single-ply membrane roof provisions use a 1/4:12 minimum slope.
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