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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.
Drywall is a panel made of calcium sulfate dihydrate with or without additives and normally pressed between a facer and a backer. It is used to make interior walls and ceilings. The plaster is mixed with fiber, plasticizer, foaming agent, and various additives that can decrease mildew, increase fire resistance, and lower water absorption. Drywall construction became prevalent in North America as a speedier alternative to traditional lath and plaster.