What is 'sheathing' primarily used for in building construction?

Sheathing serves a critical role in building construction, primarily by providing a structural layer for walls and roofs. It consists of sheets of materials, such as plywood or oriented strand board (OSB), that are attached to the framing of the building. This layer contributes to the overall strength and stability of the structure, providing resistance against lateral forces, such as wind and seismic activity.

Additionally, sheathing acts as a base for other materials, such as roofing or siding, and aids in preventing air and moisture penetration, which is essential for energy efficiency and the longevity of the building. This makes it a fundamental element in both residential and commercial construction, as it supports not just the structural integrity but also the functional aspects of the building envelope.