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Norm Abram replies: The 5/8-inch, fire-code drywall (called Type X) increases a wall's fire rating to a minimum of 1 hour, from the 30-minute rating for standard Â½-inch drywall. And it's not just thickness that makes the difference. Type X has a denser core and contains glass fibers that keep it from crumbling in the heat.
American Gypsumâs Shaft Liner has been approved for use in the following assemblies: 1  U 375: 2 Hour H-Stud Area Separation Wall System. 2  V 455: 1 & 2 Hour Shaftwall Systems using I, C-H and C-T Studs. 3  U 428: 2 Hour Shaftwall System using C-H and C-T Studs. 4  U 429: 2 Hour Area Separation Wall System using C-H and C-T Studs.