Which feature describes Type X drywall?

Which feature describes Type X drywall?

• A. It is foil backed
• B. it has fire resistant core additives
• C. it is for exterior use
• D. it is waterproof

Answer: (B)

Type X drywall is defined by its fire-resistant core. The gypsum core includes additives (often fibers) that slow flame spread and help the board maintain integrity longer in a fire, giving it a higher fire rating than standard drywall. This makes it suitable for fire-rated walls and ceilings where code requires increased fire resistance. Foil backing, exterior use, and waterproofing are not the defining features of Type X; foil-backed boards exist for other purposes, drywall isn’t typically used as exterior siding, and waterproofing is provided by other materials.

Type X drywall is defined by its fire-resistant core. The gypsum core includes additives (often fibers) that slow flame spread and help the board maintain integrity longer in a fire, giving it a higher fire rating than standard drywall. This makes it suitable for fire-rated walls and ceilings where code requires increased fire resistance. Foil backing, exterior use, and waterproofing are not the defining features of Type X; foil-backed boards exist for other purposes, drywall isn’t typically used as exterior siding, and waterproofing is provided by other materials.