North Carolina Building Contractor License Practice Exam

What is the minimum thickness for unreinforced parapet walls?

1. 2 inches

2. 3 inches

3. 3-7/8 inches

4. 4 inches

The correct answer is: 3-7/8 inches

The minimum thickness for unreinforced parapet walls is set at 3-7/8 inches. This specific measurement is important because it helps ensure the structural integrity and stability of the parapet. Parapet walls serve as protective barriers extending above the roofline, and their thickness is vital in resisting environmental pressures, including wind load and potential impacts. An unreinforced parapet wall must be thick enough to provide adequate strength without the support of internal reinforcement. The 3-7/8 inches standard reflects a balance between material efficiency and the need for a robust structure. If the wall is built thinner than this specified thickness, it may be susceptible to cracking or failure due to stressors it was not designed to withstand. Thus, adhering to this minimum thickness is crucial for safety and compliance with building codes.