Warm Roof Technology Need Not Be Complex

The increase in the level of warm roof specification is encouraging as Kiwis have been subjected for too long to damp buildings that are too hot in summer and too cold in the winter.

The warm roof hype has encouraged the introduction of superfluous materials such as mechanical plates/fasteners and cover boards to name a few. These 'assemblies' add unnecessary complexity, avoidable cost and more importantly, reduce the thermal efficiency of a warm roof.

The Viking Warm Roof system doesn't detract from its primary purpose — thermal efficiency — removing superfluous extras to allow the system to do its job unimpeded.

Viking's BRANZ appraised warm roof system (no. 713) comprises of two-layers: (i) rigid Kingspan polyisocyanurate insulation installed on top of a substrate (plywood, concrete or steel) with; (ii) any of Viking's BRANZ appraised waterproofing membrane systems installed on top. (NB: A vapour barrier is also required in Climate Zone 3).

Kingspan polyisocyanurate's superior density removes the need for a cover board, which is heavy and typically for crush-proofing. A hero of Viking's system is its two-part polyurethane foam adhesive (called F.A.S.T.) for securing insulation panels to the substrate. The wind uplift resistance of F.A.S.T. outperforms that of plates and fasteners, preventing thousands of screw punctures in the insulation and substrate that results in expensive thermal bridging.

The Viking Warm Roof system is not only suitable for new-builds, but is also commonly used as an overlay solution for re-roofing. This makes it easier for specifiers and building owners as building consents are not required, providing the existing roof is not being replaced and has satisfied the minimum 15 year durability requirement under B2.

The Viking Warm Roof also has the industry's highest possible fire rating (Group 1-S).

To learn more or register for an information pack, contact Viking Roofspec.

WarmRoof System

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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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