California Residential Inspector Practice Exam

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Prepare for the California Residential Inspector Exam. Utilize interactive quizzes and detailed explanations to master the required knowledge. Enhance your test-taking skills and boost your confidence for achieving high scores!

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Which roof slope is not suitable for the installation of asphalt shingles?

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

The correct answer is: 1:12

Asphalt shingles have specific installation guidelines that relate to the slope of the roof, which affects their performance and longevity. A roof slope of 1:12 is considered too low for asphalt shingles because at this pitch, water does not drain quickly enough, which can lead to potential leaks and moisture accumulation. Asphalt shingles are typically recommended for use on roofs with a minimum slope of 2:12, as this allows for proper drainage and helps to keep the shingles dry, reducing the risk of deterioration. Roofs with slopes of 2:12 and steeper are generally suitable for asphalt shingles, as they provide sufficient angle for water runoff. It’s also essential to ensure that underlayment and other waterproofing materials are properly installed, especially on low-slope roofs. The choice of 1:12 as unsuitable stems from its failure to meet these drainage criteria, making it a less reliable option for asphalt shingles and increasing the likelihood of maintenance issues over time.