We put sustainability at the heart of everything we do.

Environmental Statement

Earthwool® glasswool insulation is a high performance product with environmental and sustainability credentials. Earthwool® glasswool insulation is manufactured using the latest state-of-the-art technology, industry leading innovation and certified manufacturing processes to deliver one of the most sustainable and environmentally friendly glasswool products available in New Zealand.


Environmental Product Declarations (EPD)

Earthwool® glasswool insulation supports environmental claims with market leading Environmental Product Declarations (EPDs). The EPDs supporting Earthwool® glasswool insulation are one of the most comprehensive evaluations of any insulation product in New Zealand. The five separate, independently certified EPDs provide clarity and transparency about the life-cycle and environmental impact, a declaration making Knauf Insulation market leaders in product declaration.


GreenTag Certification

Earthwool® glasswool insulation is supported by GreenTag Level A certification. GreenTag is one of the leading independent eco certification organisations. Not only does it demonstrate Earthwool® glasswool insulation's environmental credentials, it also helps achieve Green Star and Homestar building certification.
GreenTag is recognised by New Zealand Green Building Council (NZGBC).

Eurofins Gold Certification

Earthwool® glasswool insulation is supported by Eurofins Indoor Air Comfort Gold as an “outstanding material” according to VOC and Indoor Air Quality Emissions certification.

The ECOSE® Technology that is used to manufacture our products replaces the phenol formaldehyde that is used by other New Zealand manufacturers. Phenol formaldehyde is a known carcinogen and even low levels are considered unacceptable by leading air quality certification organisations. This places Earthwool® glasswool insulation in a unique position and makes it impossible for our competitors to currently match this level of certification.


EUCEB Certification

Earthwool® glasswool is manufactured using EUCEB certified glasswool. Products bearing the EUCEB trademark are continually monitored and independently classified as being bio-soluble. Specifiers, installers, building owners and the public can have complete confidence in glasswool products that carry the EUCEB trademark.

Recycled Raw Material

Earthwool® glasswool insulation is manufactured using up to 80% recycled glass that is made up of post-consumer glass bottles rather than plate glass from the window industry. This process removes glass bottles from landfill, turning them into high performance, energy saving Earthwool® glasswool insulation products.

Zero Waste to Landfill

The plants that manufacture Earthwool® glasswool wall and ceiling insulation send zero waste to landfill. This achievement marks a significant milestone in Knauf Insulation's sustainability journey, in which they are constantly developing their products and processes to contribute towards greener and more energy efficient environments.

Certification for Earthwool® glasswool insulation

Manufacturer Certification


Discover the sustainability achievements the Knauf Insulation Group made in 2021