Coastal and Floodplain Construction Inspector's Practice Exam

What thickness of roof sheathing panels is generally required in high wind areas?

1. 1/4 inch

2. 3/8 inch

3. 15/32 inch

4. 1/2 inch

The correct answer is: 15/32 inch

In high wind areas, the thickness of roof sheathing panels is crucial because the structural integrity of a building can be compromised due to extreme weather conditions. A thickness of 15/32 inch is commonly specified because it strikes an optimal balance between providing adequate strength to withstand wind uplift forces and maintaining weight and cost efficiency. This thickness helps ensure that the panels can effectively distribute the loads and support roofing materials while also meeting building code requirements for structural performance in such environments. Thinner panels, such as 1/4 inch or 3/8 inch, may not provide sufficient resistance to wind pressures and could be prone to bending or breaking under extreme conditions. Similarly, a 1/2 inch thickness might be considered excessive in terms of weight and cost, making it less economically viable for many construction projects. Thus, the 15/32 inch thickness is regarded as a standard, ensuring durability and safety while being compliant with recommended building practices for high wind areas.