Viking Roofspec has held this rating for over a year now, and Viking Roofspec believes it is the only Warm Roof supplier in the market to hold this fire rating.
The fire test involved installing the Viking Warm Roof System on a steel structure located inside a special test room with a burner. The system consisted of 75mm-thick polyisocyanurate panels adhered with its specialised two-part polyurethane foam adhesive to the top face of profiled 0.55mm BMT Zincalume steel roofing. The underside of the profiled steel sheet was exposed to the inside of the test room, with temperatures of up to 1000kW, for 20 minutes.
The Group 1 rating was achieved as the heat release from the material did not exceed 1000kW within 20 minutes.
The 'S' in the rating refers to the Smoke Production Rate (SPR), which is averaged over 0-20 minutes and no more than 5.0m²/s. The Viking Warm Roof System achieved 1.9m²/s; thus comfortably achieving the Group Number 1-S Rating.