What is the primary purpose of sheathing in construction?

The primary purpose of sheathing in construction is to provide structural support and a base for exterior finishes. Sheathing consists of materials such as plywood or oriented strand board that are attached to the framing of a building—typically the walls, roofs, and sometimes floors. It contributes to the overall structural integrity of the building by providing rigidity and strength to the frame. Moreover, sheathing serves as a reliable base for various types of exterior finishes, such as siding and roofing, contributing to the building's aesthetic and protective qualities.

While other options mention important aspects of construction, they do not capture the primary role of sheathing. For instance, sheathing is not primarily intended to complete the exterior finish of a building, nor is it specifically designed to add insulation or to waterproof the foundations. Rather, insulation is usually added separately as part of the wall assembly, and waterproofing measures are more commonly applied directly to foundations rather than as part of the sheathing system on above-grade walls or roofs.