North Carolina Building Contractor License Practice Exam

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What is the minimum thickness of aluminum used as valley lining material?

  1. 0.025 inches

  2. 0.05 inches

  3. 0.075 inches

  4. 0.1 inches

The correct answer is: 0.05 inches

The minimum thickness of aluminum used as valley lining material is specified to ensure durability and performance in roofing applications. A thickness of 0.05 inches strikes a balance between providing adequate strength to withstand environmental forces, such as wind and precipitation, while also being lightweight and manageable for construction purposes. This thickness is critical because it helps prevent issues like warping or bending under the stress of weather conditions. It's common in building standards to establish specific material properties to ensure safety and longevity in construction. Therefore, 0.05 inches is recognized as the appropriate thickness for aluminum valley lining, allowing it to effectively channel water and prevent leaks in roofing systems.

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