Core TradesQuestion 43 of 700
A continuous membrane roof (such as built-up or single-ply) is generally required instead of shingles when the roof slope is LESS THAN about:
a.6:12
b.4:12
c.2:12
d.1:12
Explanation
Slopes below about 2:12 are considered low-slope and shed water too slowly for shingles, so a continuous membrane system is required. Slopes of 4:12 and 6:12 are steep-slope and suited to shingles.
Law Reference: 2025 CA Residential Code (CRC) R905 (Roof Coverings)Practice all 700 questions free — no signup required.
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