Coastal and Floodplain Construction Inspector's Practice Exam

Which orientation is required for roof sheathing in relation to the framing?

1. The long dimension shall be parallel to framing

2. The long dimension shall be perpendicular to framing

3. The short dimension shall be staggered

4. The end joints shall be aligned

The correct answer is: The long dimension shall be perpendicular to framing

The correct orientation for roof sheathing is to place the long dimension perpendicular to the framing. This configuration provides maximum support and strength, as it allows for greater load distribution across the rafters or trusses. When the long dimension of the sheathing panels is perpendicular to the framing, it minimizes the potential for sagging or deflection in the roof structure, enhancing its overall stability and durability. Additionally, this orientation helps in resisting wind uplift forces, which can be critical in coastal and floodplain areas prone to strong winds and storms. It also facilitates proper fastening to the framing, as more fasteners can be utilized along the edges and during installation, ensuring that the sheathing is securely attached. Other options suggest orientations or arrangements that do not provide the same structural integrity or load-bearing capacity. For example, aligning the long dimension parallel to the framing would not effectively support loads across the panels, increasing the risk of bending or failure. Staggering short dimensions or aligning end joints may be practical in some contexts, but they do not address the critical load distribution needed in roof assemblies.