FM classes of roof systems are based on what criterion?

FM classes of roof systems are based on what criterion?

• A. Cost
• B. Installation speed
• C. Color variety
• D. Protection level

Answer: (D)

FM classes of roof systems are based on the level of protection the roof provides. This classification reflects how well a roof assembly can guard the building and its contents under defined hazards, especially fire exposure and weather-related stresses. The rating increases as the protective performance improves, so a higher class means a greater degree of protection. It isn’t about cost, installation speed, or color options—those do not measure protective capability. Insurance and risk managers rely on these classifications to gauge risk and guide decisions, but the key idea is the roof’s ability to protect.

FM classes of roof systems are based on the level of protection the roof provides. This classification reflects how well a roof assembly can guard the building and its contents under defined hazards, especially fire exposure and weather-related stresses. The rating increases as the protective performance improves, so a higher class means a greater degree of protection. It isn’t about cost, installation speed, or color options—those do not measure protective capability. Insurance and risk managers rely on these classifications to gauge risk and guide decisions, but the key idea is the roof’s ability to protect.