Construction Supervisor License Practice Exam

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What is the minimum slope roof that metal shingles are permitted to be installed on a two-family dwelling?

A. 5:12
B. 4:12
C. 2:12
D. 3:12

The correct answer is: D. 3:12

The minimum slope of 3:12 for installing metal shingles on a two-family dwelling is important to ensure proper drainage and prevent water accumulation, which can lead to leaks and other issues. At this slope, metal shingles can effectively shed rainwater, allowing it to flow off the roof without pooling on the surface. This is crucial not only for the roofing material's durability but also for the overall safety and integrity of the structure. When a roof has a slope lower than 3:12, the ability of the roofing system to resist wind-driven rain and other weather effects diminishes, increasing the risk of water infiltration and related problems. Therefore, the adopted building codes reflect this minimum requirement to promote better performance and longevity of the roofing system. This standard ensures that metal shingles, which are often used for their longevity and low maintenance, perform effectively in various weather conditions when installed at this slope or steeper.