The classification of type 'X' gypsum board refers to the panel's:

The classification of type 'X' gypsum board refers to the panel's:

• A. Fire resistance
• B. Water resistance
• C. Edge finish
• D. Surface finish

Answer: (A)

Type X in gypsum board labeling points to how the panel performs in fire. This designation means the board has a fire-resistant core engineered to slow heat transfer, often with additives or fibers that boost its ability to maintain integrity in a fire. Because of that enhanced fire performance, Type X boards are specified for fire-rated walls and ceilings to meet code requirements for certain hours of fire resistance. This focus on fire performance is what makes Type X different from other gypsum boards. It isn’t about resisting water exposure, which would involve moisture-resistant products, nor about the way the edges are finished or the surface texture, which relate to installation details and aesthetics rather than fire protection. So the best choice is fire resistance, since the classification is all about how long the panel can help resist fire in a rated assembly.

Type X in gypsum board labeling points to how the panel performs in fire. This designation means the board has a fire-resistant core engineered to slow heat transfer, often with additives or fibers that boost its ability to maintain integrity in a fire. Because of that enhanced fire performance, Type X boards are specified for fire-rated walls and ceilings to meet code requirements for certain hours of fire resistance.

This focus on fire performance is what makes Type X different from other gypsum boards. It isn’t about resisting water exposure, which would involve moisture-resistant products, nor about the way the edges are finished or the surface texture, which relate to installation details and aesthetics rather than fire protection. So the best choice is fire resistance, since the classification is all about how long the panel can help resist fire in a rated assembly.