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

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Multiple Choice

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

Explanation:
That backing layer is called sheathing—the plywood or dimensional lumber installed over the wall framing to provide a solid surface for attaching the siding. It adds rigidity to the wall and serves as a base for the exterior finish, often working with a moisture barrier and insulation. Siding is the exterior finish itself, not the layer beneath. Framing is the structural skeleton of the wall (the studs and plates). Lath is a base used with plaster or stucco, not the typical backing for modern siding.

That backing layer is called sheathing—the plywood or dimensional lumber installed over the wall framing to provide a solid surface for attaching the siding. It adds rigidity to the wall and serves as a base for the exterior finish, often working with a moisture barrier and insulation. Siding is the exterior finish itself, not the layer beneath. Framing is the structural skeleton of the wall (the studs and plates). Lath is a base used with plaster or stucco, not the typical backing for modern siding.

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