Viking Warm Roof System's Group 1-S Fire Rating

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.

WarmRoof System

Viking Roofspec

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The most commonly accepted definition of a warm roof (for low slope roofs) is 'a roof where the insulation is installed on top of the roof structure' i.e.

NZ-Owned Business

The Viking WarmRoof System has been appraised for use as an insulating roof on buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1, paragraph 1.1 with regards to building height and maximum floor plan areas; and,
on limited access flat roofs with concrete, plywood or steel structural decks subject to specific structural design; and,
with roofs constructed to drain water to gutters and drainage outlets complying with the NZBC; and,
with roofs constructed to suitable falls (refer paragraph 15.3 and 15.4 of the Viking Warm Roof BRANZ Appraisal); and,
with no integral roof gardens; and,
situated in NZS 3604 Building Wind Zones, up to, and including Extra High

The Viking WarmRoof System has also been appraised for durability and thermal performance as an insulated roofing system on buildings that are the subject of specific design with no building height restriction. Building designers are responsible for the building design and for the incorporation of the Viking WarmRoof System into their design in accordance with the declared properties and instructions of Viking Roofspec.

Clause B1 STRUCTURE: Performance B1.3.1. The Viking WarmRoof System meets this requirement.
Clause B2 DURABILITY: Performance B2.3.1 (b), 15 years. The Viking WarmRoof System meets this requirement. See paragraph 10.1 of the Viking WarmRoof BRANZ Appraisal.
Clause E2 EXTERNAL MOISTURE: Performance E2.3.1 and E2.3.2. The Viking WarmRoof System meets these requirements. See paragraphs 15.1 — 15.9 of the Viking Warm Roof BRANZ Appraisal.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. The Viking WarmRoof System meets this requirement and will not present a health hazard to people.
Clause H1 ENERGY EFFICIENCY: Performance H1.3.1 (a). The Viking WarmRoof System will contribute to meeting this requirement. See paragraph 14.1 of the Viking WarmRoof BRANZ Appraisal.
Clause C/VM2 FIRE PERFORMANCE (of wall and ceiling linings) — ISO9705, Group 1S = highest possible rating.

BRANZ Appraised

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