For which purpose is plasterboard predominantly used?

Plasterboard, also known as drywall or gypsum board, is predominantly used for interior walls and ceilings in construction. Its primary purpose is to create a smooth, even surface that can be painted or finished to provide an aesthetic appearance while also contributing to the fire resistance and insulation of a building.

In residential and commercial construction, plasterboard is favored for its ease of installation, lightweight properties, and ability to be shaped around various architectural features. It is typically used in conjunction with metal or wooden framing to create partitions and ceilings that are durable and cost-effective.

The other options listed do not align with the primary use of plasterboard. Roof sheathing, for example, utilizes materials that provide structural support and weather resistance; fascia and soffits serve different weatherproofing and aesthetic functions; and shear walls are specifically designed to resist lateral forces, generally constructed from more robust materials such as plywood or concrete, rather than plasterboard.