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Airlay Insitu Wall Performance

Airlay Insitu Wall Performance

Airlay Insitu Wall Performance

The New Zealand Building Code energy efficiency requirements are based on the system performance of building components rather than R-Value of individual elements, such as insulation. The laboratory tested R-value of wall insulation is not necessarily an accurate reflection on its ‘real life’ installed performance.

Construction R-value is a combination of the R-values of the individual components, including the effects of thermal bridging of the framing.

In order to realise its true performance, wall insulation MUST:

  1. Long-lasting without sagging or settling. Wall insulation should not sag or slump over time since this would result in a significant reduction in its performance.
  2. Be self-supporting to maintain it's nominal thickness. The use of mechanical fixings, folds and creases reduce R-value proportionate to the rate of compression. 
  3. Be friction fitted without gaps between dwangs and studs. “Gaps around the edge of wall insulation can reduce its effective R value by approximately 3% for every 1mm gap*.”

    These three factors have proved to be a real challenge for traditional insulation materials. 

* BRANZ House Insulation Guide


InZone Industries Ltd has the only Airlay insulation manufacturing plant in Australasia producing medium and high density thermal and acoustic insulation. 

The Mammoth® wall insulation produced on the Airlay plant is different to traditional carded polyester or fibreglass insulation. The springy nature of Airlay medium density insulation means it squeezes into wall cavities to be self-supporting, uncompressed and gap-minimising. It performs exceptionally well in wall and underfloor systems. Download a copy of our brochure here.

Card Vs Airlay


Thermal Wall

To prove and document the performance of Mammoth Airlay insulation, New Zealand’s leading building research laboratory was commissioned to undertake comprehensive independent insitu testing.

Conducted over the winter period June - July 2014, measurements were made using heat flux transducers and associated software developed and calibrated by New Zealand’s leading building research laboratory. 

Test walls were 1.2m wide by 2.4m high with 90mm deep timber framing. The walls were installed in a research building and had three different types of cavity cladding:

  • Timber weatherboard
  • 12mm plywood sheet
  • Brick veneer


    Insitu Wall Testing Results


    Peace of Mind - when performing H1 calculations, specify the tested Mammoth Airlay Wall insulation with confidence, knowing that the wall construction R-Value will outperform the generic averages for equivalent systems. 

    Download the Mammoth Airlay Insulation brochure for more details.

    Read More


    Mammoth® Modern Insulation
    Manufactured by InZone Industries Ltd
    PO Box 204 289
    Auckland 2161
    New Zealand


    Call Us:
    0800 MAMMOTH
    (0800 626 668)

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