The Best Ceiling Insulation For Australian Homes

Photo of a man installing in Australia ceiling insulation

Did you know an uninsulated ceiling can contribute up to 35% of your home’s winter heat losses and summer heat gains? More than any other area of your home, it’s important that your ceiling is well insulated to keep out the heat in summer and retain the heat in winter.

In Australia, ceiling insulation is available in a variety of brands and R-values ranging from R3.0 to R7.0. Choosing the best insulation for your home is important. That’s why we recommend considering all your options beforehand.

What Is the Best Ceiling Insulation Material?

Ceiling insulation batts are most commonly made from glasswool or polyester. These two materials have excellent thermal properties, are easy to install and affordable.

Glasswool Insulation

Glasswool insulation is made from recycled glass materials and is the most common insulation material used in both residential and commercial buildings because it’s very affordable.

Although glasswool has a stigma of being itchy and uncomfortable to install, recent technological advances have improved this and today many glass wool insulation products claim to be low-itch or itch free.

Polyester Insulation

Polyester insulation is manufactured from recycled PET plastics such as drink bottles. Polyester insulation is bonded together by heat and no binder chemicals are added.

Polyester is more expensive than glasswool and is seen by some as a premium product because of its hypoallergenic properties. Since it contains no breathable fibres, it is safe for use in homes with asthma and dust allergies.

Ceiling Insulation Brand Comparison

At Pricewise Insulation, we stock a large range of reputable and high quality ceiling insulation brands, including Knauf Earthwool, Bradford Gold, Fletcher Pink Batts and Bradford Polymax Insulation.

Below is a list of the most popular features that each brand has to offer:

1. Knauf Earthwool Insulation

  • Soft to handle and install (low itch factor)
  • Manufactured from recycled materials
  • ECOSE technology, renewable bio-based binder
  • No dye or artificial colours
  • No added formaldehyde
  • Fire resistant
  • 50 year product warranty

2. Bradford Gold Insulation

  • Low allergen
  • Made from up to 80% recycled glass
  • Made in Australia
  • 100% bio-soluble
  • Non-combustible
  • Resists shrinking, mould, rot or deterioration
  • R-values up to 7.0

3. Fletcher Pink Batts

  • Lightweight, flexible, and resilient glasswool
  • Made from up to 80% recycled glass
  • Firm and rigid batts making them easy to install between standard stud spacing
  • Up to R6.0 for ceiling insulation
  • Made in Australia
  • 70 year product warranty

4. Bradford Polymax Insulation

  • 100% polyester product – soft and easy to handle
  • .Non-irritant
  • Odourless
  • Made from up to 80% recycled fibre
  • No waste is generated in manufacture
  • Made in Australia

Does R-value Matter for Ceiling Insulation?

When considering the effectiveness of an insulation product, the most important consideration is the R-Value of the product. The R-value of any insulation material tells you how effective it is at insulating. In other words, how well it can stop the transfer of heat.

Read more: What does R-Value mean?

The higher the R-value, the more effective the insulation product is at slowing down heat loss and heat gain. A higher R-Value will help you keep your home a comfortable temperature year round and reduce your heating and cooling costs.

Although a higher R-value is ideal throughout the home, some areas require more insulative power than others. The ceiling is responsible for up to 35% of your home’s heat loss and gain which is more than any other area of the home. It’s therefore very important to consider which R-value you need in your ceiling.

What R Rating for Ceiling Insulation Is Best?

Firstly, it is important to follow the Building Code of Australia (BCA) requirements for ceiling insulation according to where you live. Australia has many different climate zones and each zone has its own requirements when it comes to insulation.

  • Generally, we recommend installing ceiling insulation with a minimum rating of R4.0 for most major cities around Australia. That includes Perth, Brisbane and Darwin.
  • If you live in Melbourne, Sydney or Adelaide upgrading to an R5.0 or R6.0 is recommended. In these cooler climates a higher insulating power is required to minimise heat loss during the coldest part of the year.
  • For alpine conditions we recommend an R6.0 or R7.0 as this is the highest available R-value and most effective for these conditions.

Should I Upgrade to a Higher R-value in My Ceiling?

Due to the rising cost of energy in Australia, many homeowners are choosing to upgrade to a higher R-value than the minimum recommendations set out in the BCA.

Well insulated homes are able to maintain a comfortable temperature throughout the year and rely less on artificial heating and cooling methods.

So not only does insulation help create a more comfortable indoor environment, it also has the potential to reduce your household energy consumption and save you money on your power bill.

Insulation is a long term investment, bringing benefits that last for decades. The Insulation Council of Australia and New Zealand (ICANZ) claims that the payback period for home insulation is around 3 to 5 years.

Ceiling Vs Roof Insulation – Which Is More Important?

Ceiling insulation is installed between or on top of the ceiling rafters whereas reflective roof insulation is installed under the roofing material. Both play an important role in preventing heat loss and gain.

In most cases, using both ceiling batts or rolls in conjunction with reflective roof insulation is the most effective. However, it’s important to consult expert advice, especially if you are planning a DIY installation.

Ceiling insulation batts and rolls are referred to as bulk insulation and are best for preventing heat transfer through conduction. Reflective insulation on the other hand helps reflect radiant heat. Some products (such as Knauf Earthwool roofing blanket) have both a bulk and a reflective component.

Where to Buy Ceiling Insulation Online?

If you’re wondering where to buy insulation online, Pricewise Insulation has you covered. We stock a huge range of insulation products from Australia’s most reliable brands. Our products come in a wide selection or R-Values to suit climates across Australia from Darwin to Hobart and everywhere in between.

Call us today on 1300 729 639 to discuss your project or start browsing our ceiling insulation products now.

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18 thoughts on “The Best Ceiling Insulation For Australian Homes

  1. Les Leunig says:

    Hi, I need to retro fit insulation in the ceiling of a dwelling with cathedral ceilings.
    Zincalume roof over 150 x 50 purlins on king post trusses with lining secured to underside of purlins.
    Is there an R5 product that would fit into the 150 mm – 40 mm foil sarking – cavity?

  2. Roy says:

    Hi, I’m looking for insulation between floors (building double storey in Melbourne ). Main focus being noise cancellation along with thermal properties. Which R rating and bats would you recommend?

    • Pricewise Insulation says:

      Hi Roy,

      Thanks for your question regarding your new double storey home in Melbourne. The product that we recommend for between floors is the R4.0HD Knauf Earthwool® Acoustic Mid-Floor Insulation Batts. At the time our video about acoustic insulation was made in 2019, this product was not available. However, it now an easy choice for between floors in a double storey home.

      These insulation batts are 140mm and offer both thermal and acoustic benefits, which make them perfect for mid-floor applications. They are considerably thicker than the R2.5HD Earthwool Sound Shield Insulation Batts (90mm thick) and more dense than even the R6.0 Earthwool Ceiling Insulation Batts. The R6.0 batts are around 11kg/m3, whereas the R4.0HD batts are around 21kg/m3.

      This product is available here in both 430mm and 580mm widths to suit your home. Feel free to give our team a call on 1300 729 639 if you have any questions.

  3. Janine says:

    Hi, I am considering ceiling insulation for the roof cavity of a second story, in Melbourne. I would prefer non flammable. What would you suggest?

  4. Arturo Thomas says:

    Good evening, I am about to redo my bathroom. I have spray wool insulation that’s 20 plus years old in the ceiling and no wall or floor insulation. I live in Launceston so temperatures are frequently at or below zero in winter overnight and up-to high twenties in summer. The room only gets afternoon sun as the exterior wall to the bathroom faces west.
    The room has a floor area of approx 6sq mtr. What are your suggestions?

  5. Pricewise Insulation says:

    We are elderly and live in an area of Queensland that gets very hot (40’s) as well as very cold (minus temperatures).
    Our house is old with high ceilings and roofing iron will need to be removed to install insulation.
    Our budget is limited.
    Which type of insulation would be best for us please?

  6. Marilyn. Jensen says:

    Hi, I would like to put insulation in the roof cavity of my duplex. Could you recommend what would give me the best result as I live on the Gold Coast.

  7. Guruprasad Katapady says:

    Hi, I am from Sydney, renovation work is going on. Handyman using 2.0 22 wall batts ( 1160*430*90) for wall .
    For celling R3.5 10 calling batts (1160*580*185mm)
    Please let me know the best one.

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