Sustainable insulation products can make all the difference in dramatically boosting your home’s energy rating and tending to the environment. The most eco-friendly insulation materials are Glasswool, Polyester, Sheep’s wool, Cellulose and Earthwool. 


Glasswool, also known as fibreglass, is the most cost-effective option. It is naturally fire retardant, does not rot or attract vermin and is made from recycled glass bottles and sand.

Glass Wool Insulation Archisoul Architects

Polyester Insulation

Polyester Insulation can be misleading as it doesn’t sound eco; however, it can be continually recycled because it is polyester. In addition, this product is generally made from recycled plastic bottles and does not have any dust particles or breathable fibres, therefore suitable for people with respiratory issues.

Polyester Insulation Archisoul Architect

Sheep’s Wool

Sheep’s wool is incredibly natural as it comes directly from the source… a sheep! In addition, the material is excellent at regulating the humidity, absorbing harmful substances from the atmosphere, and its fibres trap air providing an excellent thermal barrier.

Cellulose Insulation

Cellulose Insulation is incredibly sustainable. This type of insulation is made from recycled newspapers. It is an affordable option with resistance to air leaks; however, it can burn quickly, even if treated with a fire-retardant chemical.

Cellulose Insulation Archisoul Architects

Earthwool insulation

Earthwool is free of chemicals such as phenol, formaldehyde, acrylics and artificial colours. It is fire resistant and made from renewable bio-based materials. It is relatively new to the Australian market but very popular.

If you would like to know more about eco-friendly insulation, please don’t hesitate to contact us. We are experts in the sustainability field and love to answer your questions, especially our very own, Certified Passive House Designer and Consultant, Carole Haurd!