What is the primary material used in drywall?

The primary material used in drywall is gypsum. Gypsum is a naturally occurring mineral composed of calcium sulfate dihydrate, which provides the necessary properties for making drywall sheets. These sheets consist of a layer of gypsum sandwiched between two thick sheets of paper. The gypsum core is what gives drywall its fire resistance and sound-dampening qualities.

When installed, drywall creates a smooth surface that can be painted or finished, making it a popular choice for interior walls and ceilings. This material is favored in construction because it is lightweight, easy to handle, and can be quickly installed compared to other wall materials. Its non-combustible nature also contributes to safety in buildings, as it aids in fire protection.

Other materials listed in the options, such as wood or plastic, may be used in construction and finishing but do not serve as the fundamental component of drywall itself. Fiberboard may have applications in specific situations, but gypsum remains the defining and primary ingredient in drywall production.