Why Earthwool® glasswool?

German innovation - 50 Year Warranty

Earthwool® glasswool insulation is so good that we offer a full 50 year warranty. Check your pack for warranty information.

Absorbs Sound

Earthwool® glasswool insulation will absorb sound transfer between rooms and floors.

BRANZ Appraised

Earthwool® glasswool is BRANZ appraised to ensure compliance with the building code, AS/NZS 4859.

More Insulation Per Pack - Reduces Handling

Unique compression packaging means you get up to 55% more insulation per pack and more insulation per load.

Soft To Handle - Easier To Install

The super-soft feel of Earthwool® glasswool insulation comes from a revolutionary, patented binder based on rapidly renewable materials.

ECOSE® Technology

Earthwool®glasswool insulation made with ECOSE® Technology benefits from a binder which has no added formaldehyde and is based on renewable, bio-based materials instead of traditional petro-based chemicals.

Made Using Recycled Glass

Earthwool® glasswool is made using up to 80% recycled glass and sand making it a great choice for environmentally conscious customers.

No Added Formaldehyde

Earthwool® glasswool insulation with ECOSE® Technology has no added formaldehyde.

Natural Colour

Earthwool® glasswool insulation contains no added bleaches, dyes or artifical colours. The earthy brown colour just comes naturally.


Earthwool® glasswool insulation comes with inherent fire performance and will not catch fire.

New Zealand’s Building Product Information Requirements (BPIR)

Building products that are covered by the CodeMark™ certification scheme are deemed to not be impacted by the regulation and do not require a separate BPIR document. The CodeMark™ certificate, along with associated reference documentation, provides all information outlined in the BPIR regulations, alternatively Knauf Insulation has a dedicated BPIR document for quick reference.


Solutions for the H1 compliance

New R7.0 and R8.0 single layer ceiling insulation batts are designed to reduce heat transfer through the ceiling, improve comfort and enhance energy efficiency. Insulation batts are specifically tailored to fit the most common ceiling joist spacings for quick and easy single layer installation. If using a double layer ceiling insulation solution, the top layer of insulation must cover the truss chords to reduce thermal bridging. If using a single layer insulation solution, some insulation may need to be notched — ours has been designed specifically so that it doesn’t require notching!