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50 Year Warranty for Assurance

Product assurance that Mammoth Insulation will last and last.


Mammoth polyester insulation will last for at least 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.

Ceiling Thumbs Up

BRANZ Appraised
All Mammoth ceiling blanket and wall and underfloor sections have been appraised by BRANZ and are covered by BRANZ Appraisals 797(2014) and 802(2014). 

Why does Mammoth last so long?

 - All Mammoth insulation products are heatbonded and contain no glues or other materials that may break down over time.
 - And if you ever need to remove Mammoth insulation, our products are 100% recyclable.

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


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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