Alabama Contractors License Practice Exam

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In construction standards, what thickness is usually acceptable for a vented cladding system?

3 mil
6 mil
12 mil
18 mil

The correct answer is: 6 mil

A vented cladding system typically serves the purpose of allowing proper drainage and ventilation to prevent moisture accumulation. In general construction standards, a thickness of 6 mil (0.006 inches) is commonly used for vapor barriers or membranes in such applications. This thickness provides a good balance of durability and flexibility, ensuring that the material can withstand environmental conditions while still allowing for proper airflow and moisture control. Thinner materials, such as 3 mil, may not provide adequate resistance to tearing and puncturing, especially in the installation phase or under duress from building movement or environmental factors. Conversely, thicker materials such as 12 mil and 18 mil can be overly rigid and may not allow efficient ventilation, limiting the performance of the cladding system. Therefore, 6 mil is the most suitable choice as it meets the requirements for both performance and durability in a vented cladding system.