Gypsum Type X is specifically designed for

• A. moisture resistance
• B. fire resistance
• C. acoustic insulation
• D. decorative finish

Answer: (B)

Fire resistance is what Gypsum Type X is designed to deliver. The Type X gypsum board has a fire-resistant core reinforced with noncombustible fibers (often glass fibers). This reinforcement slows heat transfer and helps the panel maintain its structure during exposure to fire, giving the wall or ceiling a higher fire-resistance rating in fire-rated assemblies. In practice, a 5/8 inch Type X board is commonly used to achieve a 1-hour fire rating in standard walls, though exact ratings depend on the assembly details.

Moisture resistance isn’t the primary purpose of Type X; there are moisture-resistant boards for that. Acoustic performance and decorative finish depend on the overall assembly and finishes, not the board’s fire-rated design.