Gypsum board, also known as drywall, plasterboard or wallboard, is used to form panels made of gypsum plaster pressed between two thick sheets of paper. Gypsum board is used as partitions and linings of walls, ceilings, roofs and floors. It possesses many attributes that make it an attractive construction material.

A gypsum board containing 45% by weight of PCM was reported to store 5 times more energy per unit mass than a conventional plasterboard and the same amount of energy than a brick wall of 12 cm thick.

Gypsum board may be used also in bathrooms as an underlying surface which is covered with plastic or ceramic tile and for this purpose it is often referred to as a "tile-backing board." In applications such as these, it is important that the gypsum board exhibit good water resistance.