USG Corporation, through its subsidiaries, engages in the manufacture and distribution of building materials primarily under SHEETROCK, DUROCK, and FIBEROCK brands worldwide. The company manufactures and markets gypsum and related products, including gypsum wallboard, joint compounds used for finishing wallboard joints, cement boards, gypsum fiber panels, poured gypsum underlayments, and various construction plaster products. Its gypsum products are used in various building applications to finish the interior walls, ceilings, and floors in residential, commercial, and institutional construction.