PVC-coated steel roofing tiles are a common roofing material widely used in places such as industrial plants, warehouses, and carports. Many people are concerned about one specific property—fire resistance—because it is directly linked to building safety as well as the safety of people’s lives and property. PVC-coated steel roofing tiles are made of thermoplastic materials, and their fire resistance rating depends on two factors: the type of flame retardants added to the formulation and the proportion of those flame retardants. As a result, the fire resistance performance of PVC-coated steel roofing tiles produced by different manufacturers varies significantly.
What fire resistance rating can PVC-coated steel roofing tiles achieve?
According to the national standard for classifying the fire performance of building materials, plastic-steel roofing tiles generally meet Class B1 requirements. Class B1 is defined as “flame-retardant,” meaning the material does not ignite easily when exposed to an open flame. Furthermore, once removed from the flame, it self-extinguishes without producing molten droplets. It is suitable for locations with high fire safety requirements. Although Class B2 plastic-steel roofing tiles are combustible, they burn at a relatively slow rate. When used in typical industrial facilities, they can still meet basic fire safety codes.
When actually selecting a product, you can verify the specific fire resistance rating by reviewing the product’s test reports. PVC-steel roofing tiles manufactured by reputable manufacturers will have their fire resistance rating labeled on the product and will also provide reports issued by third-party testing agencies. For special facilities such as chemical processing plants and flammable goods warehouses, it is recommended to use Class B1 flame-retardant plastic-steel roofing tiles. These products contain highly effective flame retardants in their formulation, which can effectively slow the spread of fire.
How to Determine the Fire Resistance Quality of PVC-Coated Steel Roofing Tiles
The most direct way to assess the fire resistance of PVC-steel roofing tiles is to check whether the product has passed testing by the National Fire Protection Product Quality Supervision and Inspection Center. For compliant flame-retardant plastic-steel roofing tiles, the test report will clearly list key indicators such as the oxygen index, burning droplets, and smoke density. The higher the oxygen index, the more difficult it is for the material to burn; generally, the oxygen index for flame-retardant plastic-steel roofing tiles is 30% or higher.
Furthermore, a simple method for testing is to use a lighter to ignite the edge of a tile. High-quality, flame-retardant PVC-steel tiles will extinguish immediately once removed from the flame source, with only slight charring visible on the surface and no spread of open flames. In contrast, ordinary, non-flame-retardant plastic-steel roofing tiles will continue to burn, producing thick black smoke and melting. Furthermore, plastic-steel roofing tiles manufactured by reputable manufacturers are backed by a comprehensive and transparent quality traceability system, with the packaging clearly marked with the production date, batch number, and fire resistance rating.
When using plastic-steel roofing tiles in industrial buildings, fire safety measures must also be taken into account. Even if Class B1 flame-retardant plastic-steel roofing tiles are selected, fire compartments must be established on the roof, and automatic sprinkler systems and fire alarm devices must be installed. During daily use, avoid piling flammable debris on the roof and regularly inspect the roofing panels for damage to ensure that fire resistance is not compromised by aging. Choose products from large, certified manufacturers—such as Gaoyi, Hongbo, and Gongli—as their products offer greater assurance in terms of fire resistance.
Keywords: Fire-resistant PVC-coated steel roofing tiles
