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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.
Views: 2498. ACX plywood is a type of plywood of a very high grade. While it is not a species of tree or wood, specifically, it is a very specific degree of wood. The letters in the name âACX Plywoodâ refer to the grade of wood, and glue, used to make the plywood product.hile it is not a species of tree or wood, specifically, it is a very specific degree of wood. The letters in the name âACX Plywoodâ refer to the grade of wood, and glue, used to make the plywood product.