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The Importance of Ceiling Insulation in Every Australian Home

High-Performance Ceiling Insulation with Earthwool®

Good ceiling insulation is essential for keeping your home comfortable year-round. It helps reduce energy use and lowers heating and cooling costs. At Earthwool®, we offer a wide range of ceiling insulation batts, including popular options like R4.0 and R4.1 insulation, suitable for homes across Australia’s diverse climates.

Our products are designed for maximum thermal performance, while being soft to handle, easy to install, and eco-friendly. Made with ECOSE® Technology, Earthwool® insulation contains no added formaldehyde and is made from up to 80% recycled glass, making it a safer, more sustainable choice for your home.

Why Choose Earthwool® for Your Ceiling Insulation Needs

When it comes to insulating your ceiling, Earthwool® stands out for its innovation, safety, and sustainability. Whether you’re installing R4 ceiling insulation, upgrading with insulated ceiling panels, or simply seeking better thermal performance, here’s why Earthwool® is the trusted choice across Australia.

  • Made with up to 80% recycled glass
  • ECOSE® Technology: No added formaldehyde
  • Soft to handle and easy to install
  • Excellent thermal and acoustic performance
  • Available in a range of R-values to suit different climates and needs

What Are R-Values and Why Do They Matter?

R-Values and Earthwool® Ceiling Insulation

R-Values indicate how well insulation resists heat flow—higher R-Values mean better thermal performance and energy efficiency. Choosing the right R-Value can help reduce heating and cooling costs while improving comfort year-round.

Earthwool® offers high-performance ceiling insulation batts ranging from R-3.5 to R-8.0, ideal for meeting different climate and building requirements. Whether you’re upgrading existing insulation or building new, Earthwool® provides energy-efficient, environmentally friendly solutions that support long-term savings and comfort.

It's easy to see why our Earthwool® range is a popular choice amongst DIYers and installers.

It’s lightweight, easy to install, and with revolutionary ECOSE® Technology its not too itchy as well! There are Earthwool® insulation products designed specifically for roofs, ceilings, walls and under floors, and they all provide outstanding thermal insulation as well as exceptional acoustic performance.

Take a look at the benefits:

  • Exceptional thermal and acoustic performance
  • Reduces energy bills
  • Soft handling
  • No added formaldehyde
  • Odourless
  • Naturally brown – no artificial colours added
  • Non-Combustible
  • Manufactured using up to 80% recycled glass

Explore our Ceiling Insulation Products

Frequently Asked Questions

What is the fire performance of Earthwool® insulation?

Earthwool® insulation is non-combustible and complies with the requirements of the Australian Standard AS1530.1 1994.

What is the acoustic performance of Earthwool® Ceiling insulation?

All Earthwool® products will provide some acoustic performance, as glasswool insulation comes with inherent sound absorbing properties.

Are vermin or insects attracted to Earthwool®?

No. Earthwool® insulation has been tested to show that it will not sustain vermin or attract insects.

Can I use Earthwool® Ceiling batts in my walls?

No. Earthwool® Ceiling batts are not designed to be used in walls and should not be compressed (squashed). Compressing Earthwool® insulation will reduce the thermal performance (R-Value) of the product and could potentially cause future issues, as the products are designed to recover to their specified thickness.

Why is Earthwool® softer and less itchy than traditional glasswool?

Earthwool® uses a combination of new technologies, which make the product more comfortable to handle. Firstly, Knauf Insulation’s proprietary fiberisation process creates longer strands resulting in less ‘ends’, to reduce mechanical irritation. Secondly, Knauf Insulation’s patented ECOSE® Technology results in a much softer, less ‘crunchy’ and less dusty insulation product compared to traditional glasswool products made using formaldehyde.

Why is Earthwool® brown?

The distinctive brown colour of Earthwool® results from ECOSE® Technology. This natural binding process leads to a natural shade of earthy brown – free from dye or colourants. This is a result of five years of intensive research and development, as part of our commitment to being at the forefront of sustainability. In some cases, if Earthwool® is exposed to UV radiation, it may result in a white bleaching effect, however product performance is not diminished.

How does the use of ECOSE® Technology make Earthwool® more sustainable than traditional glasswool products with formaldehyde?

ECOSE® Technology is more sustainable because it uses a natural resin, which is less energy intensive than traditional formaldehyde binders. With ECOSE® Technology, rapidly renewable, organic materials replace the traditional petro-based chemicals used in standard insulation binders to create more advanced and sustainable products. ECOSE® Technology is formaldehyde free.

What testing has Earthwool® with ECOSE® Technology gone through?

Earthwool® products have undergone a comprehensive and rigorous evaluation to determine their environmental effects and acceptability in use, and indicate that products with ECOSE® Technology improve on the already excellent performance of conventional glasswool products. As with all Knauf Insulation products, Earthwool® has been independently appraised with BRANZ to comply with Australian Standards. Also, Earthwool® insulation is certified by Eurofins Gold as an ‘outstanding material’, according to the VOC (Volatile Organic Compounds) Indoor Air Quality emissions regulations. Earthwool® was awarded Eurofins Scientific’s first Indoor Air Comfort Gold Standard certificate as part of the Eurofins Air Comfort Gold standard testing and certification programme.

Why does the Earthwool® insulation packaging look different in store?

We’re currently in the process of updating some of our packaging, so you may find that the images shown here on our website vary slightly from what you see in store. The products within the packaging are of the same high quality though, so be sure you check the specs on the outside to make sure you’re buying the right insulation for your needs.

Check out our official Ceiling Insulation Installation Guide.

It will show you how to prepare, install and complete your project efficiently

View Guide