Definitions

1. noun

A type of construction material made from paper-based materials, often used as a substitute for gypsum board or drywall.

“The carpenter used wallboard to cover the walls of the new room.”

2. noun

In the context of building codes, a wallboard can also refer to a type of exterior sheathing material made from oriented strand board (OSB) or plywood.

“The builder checked the local building codes before installing the wallboard on the exterior of the house.”