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Mammoth polyester insulation will last for 50 years


InZone Industries Ltd (InZone) manufactures Mammoth® 100% polyester insulation products in New Zealand which are designed to provide long-lasting, durable thermal and acoustic insulation.

InZone warrant that, provided the polyester insulation is installed correctly and remains adequately protected, Mammoth will perform as well as when installed for 50 years*.

This 50 year Manufacturer’s Warranty covers insulation material durability when installed in accordance with the manufacturers installation instructions and NZ4246: Energy Efficiency - Installing insulation in residential buildings. 

Download our Mammoth Insulation Warranty here.

*50 Year Warranty applies only to 100% polyester insulation products manufactured by InZone Industries Ltd and not to other composite products manufactured by InZone.

BRANZ Appraised


Where required for an assurance of building code compliance, a selection of Mammoth’s thermal insulation and acoustic products are BRANZ appraised.

All Mammoth ceiling blanket, and wall and underfloor sections have been appraised by BRANZ and are covered by BRANZ Appraisal 797 (2020) and Appraisal 802 (2020).

Why does Mammoth last so long?

  • All Mammoth insulation products are made from 100% polyester, are heat-bonded and contain no glues or other materials that may break down over time.
  • Mammoth's thermal and acoustic insulation is made from 100% polyester and uses up to 15,600 recycled plastic bottles per 100 sqm*. Read more about our sustainability commitment.
  • We take fibre made from plastic bottles, which would otherwise be waste, and manufacture the fibre from the bottles into polyester insulation. Read more about our manufacturing.
  • And if you ever need to remove Mammoth insulation, our products are 100% recyclable.
  • Unaffected by moisture, Mammoth insulation will continue to perform once dried out.

Current presence in the New Zealand market

  • We are the biggest supplier to the government’s EECA programme for polyester insulation for existing homes.
  • We have a large presence in the new build and commercial markets within NZ.
  • We are the exclusive insulation supplier for Kainga Ora - Existing homes through Placemakers nationwide.
  • We supply building merchants, insulation resellers, installers, and other EECA programmes nationwide.

Our Quality Control and Assurance Processes

Our business carries third party accreditation, for which the criteria are audited to ensure our processes are robust and quality is designed, measured and controlled.

  • carboNZero certified organisation
  • Thermal products are BRANZ appraised
  • Environmental Choice certified (ECNZ) for selected range of insulation products

All product is manufactured to specification, measured and graded during and at the completion of the production process.

All raw materials and sampled finished products are sent for third party QA testing as a control.


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


Call Us:
(0800 626 668)

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