Labels:dialog box | hakham | person | poster | window | windowpane OCR: Understanding the UL Fire Resistance Directories What isthe difference between "regular" and "type gypstm wallboard? "eXtra" fire resistant Type wallboard. which C typically required to achieve fire resistance ratings, is formulated by adding noncombustible fibers to the gypsum. These fibers help maintain the integrity of the core as shrinkage occurs, providing greater res istance to heat transfer during fire exposure Prev Next diference regutar waltboard
