Concrete and masonry are excellent building components because of their what kind of fire resistance?

• A. Mandated
• B. Require
• C. Structural
• D. Natural

Answer: (D)

Concrete and masonry have inherent, or natural, fire resistance because they are noncombustible and dense. Their mass absorbs heat and slows heat transfer, helping the structure maintain stability during a fire. This resistance comes from the material itself, not from any requirement or added protection, which is why it’s described as natural fire resistance.