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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.
The Letter X. The letter X in CDX refers to the type of glue used in the factory to bond the plywood veneers. Some mistakenly think the X stands for exteriorâwhich is not true, exactly. The letter stands for exposure, which means the plywood is tough enough to withstand a little moistureâbut for only a short time.