A Drywall is used to construct walls and ceilings and has become a popular material now used in most homes. Drywall is also known as wallboard, plasterboard or gypsum board and takes the form of panels of gypsum plaster pressed between thick sheets of fiberglass matting or heavyweight paper that are called facers and backers. Additives that prevent mildew, condensation or flammability can be induced in the gypsum plaster layer.