Which statement best describes Type X gypsum board?

• A. It resists moisture best
• B. It provides fire resistance
• C. It has superior sound insulation
• D. It has low thermal conductivity

Answer: (B)

Type X gypsum board is specifically designed to provide fire resistance. This type of board contains additional fibers and additives that enhance its ability to withstand high temperatures, making it suitable for applications where fire safety is a concern, such as in wall assemblies rated for fire resistance. This capability is indicated by its ability to delay the passage of fire, which can be crucial in meeting building codes and ensuring safety in residential and commercial structures.

While Type X gypsum board has some moisture resistance and can contribute to sound insulation compared to standard boards, its primary designation and characteristic that sets it apart from other types is its enhanced fire-resistant properties. The mention of thermal conductivity is less relevant in the context of Type X specifications, as its design is not predominantly focused on that aspect.