Drywall is compressed gypsum between harder stock paper or in some cases fiberglass. It makes a much easier and nicer interior finish over past ways of having slats and plaster or some real or faux beaded wood paneling. In some modern construction it has to be used when a structural sheathing is used like thermoply, thermobrace or dryline is used to have the proper structural strength for walls in stud built house.
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