What class includes construction consisting of masonry or fire material with a fire resistance rating of 2 hours or less?

The correct answer refers to Class 5 - Modified Fire Resistive. This classification is assigned to buildings that are constructed using masonry or other fire materials and have a fire resistance rating of 2 hours or less. The key factor in this classification is the fire resistance rating, which allows for some level of fire safety while still being considered "modified" compared to higher classifications that require stronger resistance ratings.

Buildings in this class might typically include reinforced concrete or concrete block structures that meet specific criteria for fire safety. Understanding the differences in fire-resistive classifications is crucial, especially since they impact insurance ratings, premiums, and overall risk assessments for structures.

The other classifications pertain to different types of construction materials and fire resistance ratings. Class 4 involves noncombustible masonry construction with different longevity against fire, while Class 6 requires a higher level of fire resistance, often demonstrating more robust protective measures. Class 2 is focused on heavy timber construction but does not pertain to masonry or fire materials with a lesser fire resistance rating. Understanding these distinctions is essential for accurate assessment and compliance in property insurance and construction standards.