WarmSpan - the future of low-slope roofing

Viking WarmSpan is a warm-roof-on-steel roofing system for low-sloped roofs. It has been engineered in New Zealand and is the country's simplest, most energy efficient and cost-effective warm roof system.

Viking's full proprietary, BRANZ Appraised WarmSpan system is made up of three components: a wide-spanning steel tray roof deck that also forms the vapour barrier; Kingspan Polyisocyanurate (PIR) rigid insulation panels are adhered on top, waterproofed with one of Viking's membrane systems.

Viking WarmSpan is not just a roofing system. It is a tool that provides building owners and architects with a fully-engineered; energy efficient low-slope roof system; facilitating a smarter method for a design and construction.

Viking WarmSpan has been specifically engineered and tested to comfortably exceed New Zealand’s Building Code’s minimum standards. The WarmSpan system has a spanning ability between purlins of up to 3.6m (versus the 400mm centered joists required under a heavy 17mm plywood substrate for a traditional membrane roof).

This reduces a building’s overall structural cost without compromising the integrity of the building and delivers increased performance and greater durability.

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System Benefits:

Less weight than a traditional membrane roof
No fasteners required means no thermal bridging
Highest possible fire rating – Group 1S
Integrated vapour barrier (one less layer than other systems)
Strong wind uplift resistance (6.5kpA)
Specialised two-part foam adhesive to secure panels to steel tray (avoids mechanical fasteners and thermal bridging)
Tapered option = promotes watershed
Polyiso has the highest R-Value = maximum ROI
The ability to add a cover board for high foot traffic commercial roofs
Installed only by Viking Licensed Applicators
Full System Warranty Option: 20-years (conditions apply**)

The simplest assembly is called WarmSpan ‘Classic’. Additional components such as vapour barrier; cover board; and walkway rolls are available depending on the specific requirements of the building, determined by geography; acoustics; foot traffic, etc.

The complete WarmSpan series is outlined below.

Dave Taylor - Dave Taylor Roofing Ltd

"Aside from WarmSpan’s cost-effectiveness, the sequence of installation is also user-friendly eg: The steel tray substrate is installed first, providing the building with a waterproof cover which allows interior trades to commence work earlier than normal. The rest of WarmSpan’s components can then be installed with the care they deserve ie: with slightly less time pressure to ‘Get the roof on!"

The WarmSpan Series

WarmSpan 'Classic'

This is Viking’s basic assembly comprising of:

Engineer-tested Steel tray substrate (either Steel & Tube ST900, or Metalcraft’s Metcom7)
Kingspan TR27 Polyisocyanurate insulation board
Either of Viking’s CodeMarked membrane systems; Viking Torch-On or Enviroclad

WarmSpan 'Acoustic'

This is Viking’s answer to those buildings with specific sound insulation requirements. When used with 75mm Polyiso board and two-layer Torch-On the WarmSpan Acoustic roof blocks 31 decibels of outside noise (STC rating) and transmits 53 decibels of rain noise.

The full assembly includes:

Engineer-tested Steel tray substrate (either Steel & Tube ST900, or Metalcraft’s Metcom7)
Kingspan TR27 Polyisocyanurate insulation board
USG Boral Secure Rock cover board 10mm
Either of Viking’s CodeMarked membrane systems; Viking Torch-On or Enviroclad

WarmSpan 'Light Traffic'

While most roofs experience next to no foot traffic apart from the occasional roof inspection; some require protection from regular foot traffic. In the case of those roofs waterproofed with Viking’s Enviroclad, a proprietary TPO weldable walkway mat can be installed in strategically placed parts of the roof to channel visitors along the same protective pathway.

In the case of Torch-On projects, an extra layer of cap sheet in a different colour; coated with two layers of crystal glaze, will achieve the same result.

The full assembly includes:

Engineer-tested Steel tray substrate (either Steel & Tube ST900, or Metalcraft’s Metcom7)
Kingspan TR27 Polyisocyanurate insulation board
Either of Viking’s CodeMarked membrane systems; Viking Torch-On or Enviroclad
Either TPO-weldable walkway mat or an extra layer of a different coloured cap sheet

WarmSpan 'Heavy Traffic'

Roofs can be daily work places for some people. In these cases, extra protection is recommended in the form of cover board (with walkway mat on top) installed in specific areas, not just for foot traffic but, for example, where freight is regularly craned onto the roof and stored.

The full assembly includes:

Engineer-tested Steel tray substrate (either Steel & Tube ST900, or Metalcraft’s Metcom7)
Kingspan TR27 Polyisocyanurate insulation board
Either of Viking’s CodeMarked membrane systems; Viking Torch-On or Enviroclad
SG Boral Secure Rock cover board installed in strategically placed traffic areas
Weldable walkway mat or cap sheet installed on the cover board

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