Underfloor Insulation

Our underfloor insulation uses

Mammoth™ products - a sustainable choice.

  • All Mammoth™ products are Red List Free - International Living Future Institute

  • Manufactured within a carboNZero certified organisation.

  • Mammoth products contain recycled polyester fibres. The recycled fibre used by Mammoth comes from recycled plastic bottles.

  • Recycling plastic protects the environment by keeping the carbon content locked up in the polyester fibre and reducing landfill waste.

  • Mammoth products are made in a near zero waste production process and are fully recyclable.

  • R2.5 Wall Section & R2.6 Wall Blanket is Environmental Choice certified.

  • Soft roll-form blanket insulation

  • 100% polyester fibres

  • Moisture resistant for use underfloor

  • Won't affect electrical wiring like polystyrene options can

  • Heat bonded - no glues or resins used in manufacture

  • No Formaldehyde or pesticides added

  • Easy to handle - non-irritant and non-toxic

  • Performance warranted for 50 years*

  • Manufactured in New Zealand by a carboNZero certified manufacturer

About the Mammoth Underfloor Insulation Blanket


This is made from 100% polyester fibres and is a great option for reducing heat loss through floors.

The blanket is moisture resistant is designed to be stapled into place between floor joists by an experienced installer or builder. Mammoth underfloor blanket is suitable for both new and existing homes and is available in the range of widths.