Metal roof shingles shall not be installed on roof slopes below which value?

• A. 0.10
• B. 0.13
• C. 0.17
• D. 0.20

Answer: (B)

Metal roof shingles require a minimum slope to ensure proper drainage and reliable sealing. If the roof is too flat, water won’t shed effectively and fasteners and underlayment are at greater risk of failure, leading to leaks. The accepted minimum is 0.13 rise per unit of run (roughly 1.56 inches of rise for every 12 inches of run, about a 1:7.7 ratio). Slopes below 0.13 are not permitted for this roofing type. Slopes at or above 0.13 are acceptable, with 0.17 and 0.20 being steeper but still compliant.