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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.
Dow Blue Board & Thermax Rigid Board Insulation. We offer Dow Thermax (polyisocyanurate) and Dow Styrofoam (XPS, extruded polystyrene) known as Blue Board. Both are closed cell foam products. Rigid insulation comes in panels of various thickness which provide different R values.