What is the role of sheathing in roof framing?

Sheathing plays a crucial role in roof framing primarily by providing structural strength and serving as a nailing base for the roofing material. It is typically made from plywood or oriented strand board (OSB) and creates a solid layer that enhances the overall structural integrity of the roof. This layer helps distribute the load from the roof covering and other forces acting on the roof, such as wind and snow, thereby ensuring stability.

The sheathing also serves as a reliable surface for attaching roofing materials, such as shingles or metal roofing, ensuring that these materials are securely fastened and can withstand the elements. Additionally, while sheathing may contribute to some degree of waterproofing, its primary function is not to act as a waterproof barrier, but rather to provide a robust framework for the roofing system and help maintain the roof's shape under various stresses.