USG Corp. has unveiled Durock Advanced Skim Coat Floor Patch and Durock X Floor Patch, the newest additions to a line of versatile, easily installed products engineered to deliver superior performance. USG Durock Advanced Skim Coat Floor Patch is a premium, trowelable, calcium aluminate patch and skim coat, which is ideal over concrete and wood subfloors and most interior floors, including tile. USG Durock X Floor Patch is a versatile, trowelable cementitious patching compound ideal for interior use over concrete and approved wood subfloors.