Which tests are conducted by FM for roof systems?

• A. Wind uplift resistance only
• B. Hail impact resistance and fire resistance
• C. Wind uplift resistance, hail impact resistance, fire resistance, puncture and tear resistance, thermal cycling and fatigue
• D. Thermal cycling and fatigue only

Answer: (C)

FM Approvals tests roof systems across a broad set of performance criteria because roofs face multiple threats in service. Wind uplift resistance shows the system can stay in place under high wind pressures; hail impact resistance checks the surface’s ability to withstand hail damage; fire resistance evaluates how the system behaves in fire scenarios and contributes to overall safety; puncture and tear resistance assesses durability against punctures and tearing from walking, equipment, or sharp debris; and thermal cycling and fatigue simulate repeated temperature changes that cause expansion, contraction, aging, and potential sealant or attachment failures over time. Together, these cover the main ways a roof can fail in the field, which is why the comprehensive set is the best answer. The other options leave out important performance areas, such as hail, fire, puncture/tear, or thermal cycling, which are all relevant to real-world roof performance.