General Contractor Practice Exam

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According to the code, what is the minimum slope on which asphalt strip shingles may be installed?

3:12
1:12
2:12
4:12

The correct answer is: 2:12

The minimum slope for installing asphalt strip shingles is 2:12. This means that for every 12 horizontal units, there must be at least 2 vertical units of rise. Roof slopes below this can lead to water infiltration issues since the shingles may not shed water effectively, putting homes at risk for leaks and damage. While some roofing materials may be suitable for lower slopes, asphalt strip shingles are typically designated for a minimum of 2:12 to ensure proper drainage and longevity of the roofing system. Slope requirements are established in building codes to ensure safe and effective construction practices, reflecting the performance characteristics of the materials used. Higher slopes are preferable for shedding water, but the 2:12 minimum is a standard threshold to maintain reliability and structural integrity in various weather conditions.