A Class A fire-resistant roof includes the entire roofing system, including the deck, insulation, underlayment, and even the roof incline. The roof sheathing material plays a large role in preventing ignition and slowing the spread of fire to other parts of the building.
Materials used in Class A fire-resistant roofs include materials such as thermoplastic-reinforced polymer (TRP), metal panels, asphalt felt, or rigid mat systems.