Which term refers to the plywood or dimensional lumber that covers the walls under the siding?

Which term refers to the plywood or dimensional lumber that covers the walls under the siding?

• A. Siding
• B. Sheathing
• C. Framing
• D. Drywall

Answer: (B)

The key idea is the wall’s base layer that sits on the framing and provides a solid surface for the exterior finish. This layer, made of plywood or dimensional lumber like OSB, is called the sheathing. It covers the studs, adds rigidity to the wall, and gives a nailable surface for installing siding plus a base for weather barriers. Siding is what you see on the outside as the finish, framing is the internal structural skeleton, and drywall is the interior gypsum panel. So the base layer under the siding is sheathing.

The key idea is the wall’s base layer that sits on the framing and provides a solid surface for the exterior finish. This layer, made of plywood or dimensional lumber like OSB, is called the sheathing. It covers the studs, adds rigidity to the wall, and gives a nailable surface for installing siding plus a base for weather barriers. Siding is what you see on the outside as the finish, framing is the internal structural skeleton, and drywall is the interior gypsum panel. So the base layer under the siding is sheathing.