North Carolina Building Contractor License Practice Exam

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What is the minimum head lap for slate roofs with a slope greater than 20:12?

1/4:12
1/8:12
1:12
1:16

The correct answer is: 1/4:12

The correct minimum head lap for slate roofs with a slope greater than 20:12 is indeed one-quarter of an inch per foot of slope, which is a significant aspect of slate roofing installation. This head lap measurement is crucial as it ensures that water runs off the roof effectively, reducing the risk of leaks and ensuring durability. The minimum head lap specification for slate roofs on steeper slopes addresses the fact that on these slopes, water drains more quickly compared to lower slopes, allowing for less water retention behind the slates. By having a head lap of one-quarter inch, the installation provides enough overlap to prevent water intrusion while still maintaining the aesthetic appearance of the roof. This aspect of roofing is essential for professionals to understand, as adhering to guidelines like these helps in ensuring the longevity and effective performance of the roofing system. Understanding the nuances of different materials and their specific installation requirements is critical for compliance with building codes and best practices in construction.