What is the purpose of a sheathing material in construction?

The purpose of sheathing material in construction primarily centers on its role in providing structural support and creating a surface for finishes. Sheathing is typically installed on exterior walls before insulation and siding are added, and it serves to stabilize the wall structure. By adding rigidity, sheathing helps prevent the walls from warping or collapsing under loads, thus ensuring the overall integrity of the building.

Additionally, sheathing materials—such as plywood or oriented strand board (OSB)—create a solid surface that can support various exterior finishes, like siding. This attachment point is crucial for the long-term performance and protection of the building envelope. While sheathing may offer some degree of insulation and may play a part in the aesthetic aspect of a home, its primary function is to provide strength and a suitable base for subsequent layers in the construction process. Thus, the emphasis on structural support and finish surface is what strengthens the validity of this answer.