Which gypsum product is required for fire-rated applications?

• A. Gypsum Type X
• B. Gypsum Green board
• C. Gypsum System Standard Sizes
• D. Gypsum wallboard installation

Answer: (A)

Fire-rated assemblies need a gypsum board that can withstand heat longer and keep the wall’s integrity during a fire. Gypsum Type X is designed for that purpose. Its fire-resistant core and glass-fiber reinforcement slow heat transfer and help prevent early failure of the board, allowing the assembly to achieve a certified fire rating. In practice, a common choice is 5/8 inch Type X board used with the right framing and joint treatment to meet a 1-hour rating; thicker boards or additional layers can achieve longer ratings as required by code. Other options described are not about fire resistance—green board is moisture-resistant, standard gypsum wallboard installation covers general installation practices, and system sizes refer to dimensions, not fire performance. So the material formulated for fire resistance is the Type X gypsum board.