Polymax R2.5 | VIC Melbourne | Polyester Underfloor Insulation
Polymax R2.5 Underfloor Insulation is the game-changer for chilly Melbourne mornings and long, draughty winters. Keep your toes warm, your home cosy, and your bills under control.
🚛 Delivery direct to your doorstep
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Pickup available at Preston Warehouse
on Tuesdays and Fridays 8AM - 3PM🗓️ Availability: In Stock
🔄 Replacement guarantee
🏅 70 years product warranty
Pairs well with
Polymax R2.5 | VIC Melbourne | Polyester Underfloor Insulation
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Product details
Description
Specification
| Width | 450mm | 430mm |
| Product R Rating | R2.5 | R2.5 |
| Pack Type | Standard | Narrow |
| Area Per Pack | 9.0m2 | 8.62m2 |
| Typical Coverage | 9.0m2 | 9.0m2 |
| Rolls Per Pack | 2 | 2 |
| Length Per Roll | 10 metres | 10 metres |
| Loft/Thickness | 140mm | 140mm |
| Size of Pack Height | 860mm | 860mm |
| Size of Pack Diameter | 700mm | 700mm |
| Weight | ~18Kg | ~15Kg |
| Material Polyester | 100% | 100% |
| Material Recycled Poly | 80% | 80% |
| Manufactured | Australia | Australia |
| MKS RAYL/M | NA | NA |
| Apha W | NA | NA |
| NRC | NA | NA |
How To
ecoMaster have made it easy for you to insulate your own wooden floors with the safest and most effective Polymax underfloor insulation.
What you will need:
- Stapler (Electric or Cordless, Double Insulated - not a hand stapler)
- Staples (Galvanised)
- LED Headlamp or Work Light
- Gloves (Garden)
- Goggles
- Tarps (Helps keep insulation clean)
- Lead/Extension Cord (if using an electric stapler)
- Clothes that can get dirty
- An installation buddy
Insulating a Web Truss Floor can be tricky, so we have a "How To" video to make it easy:
Pro Tips:
- Open the packs promptly to allow the insulation to reloft before installing.
- We recommend stapling the material to the lower edge of the floor joists at 100mm intervals to ensure it is secure and will not sag over time.
- Fit the insulation ensuring that the upper surface is in direct and flat contact with the floor. Excessive bunching up of the insulation creates voids which encourages vermin access.
- Where the joist spacing is not amenable to straight going, use the turn and tear method to ensure continuous contact with the floor to exclude rodents. Neatness counts!
- For the greatest long lasting result, make sure the insulation staples that are used are galvanised staples.
Find Out More:
- Join the ecoMaster MasterClass with Technical Director Maurice to find out all about underfloor insulation and details on how to install underfloor insulation to get the greatest hassle free installation experience.
- How to Measure Your Home's Floor Area
- How to Calculate How Much Insulation You Need
Delivery
Can I collect my order from the Melbourne depot?
No. The Melbourne depot is closed to the public.
Where can you deliver to?
We can ship to all suburbs of Melbourne and surrounding areas. Regional freighters may be able to deliver to regional areas in Victoria. Please contact us with your location for a freight quote.
How will my order be delivered?
Your order will be delivered by a CSR driver.
Please take note of our Refund Policy before you place your order.
FAQ
Frequently asked questions
Q: What does Polymax Underfloor Insulation do?
A: Polymax underfloor insulation acts as a thermal barrier for your floors, to keep the outer temperature outside, and maintain the temperature of your home inside. It also stops draughts, dust and pollen from coming up through your floorboards.
Q: Can Polymax Underfloor Insulation be used in my climate zone?
A: You can use Polymax Underfloor Insulation in climate zones 2, 4, 5, 6, 7, & 8.
Q: Should I order the 430mm or the 450mm wide Polymax?
A: For best fit and easiest installation, the material width should be 20mm wider than the space between the joists. To order the best material for your project, it is best to measure the space between the joists of your floor. Measure a number of joist spaces as they do vary. Use the most common spacing. Typically, joists will be 410mm (common in Sydney and Brisbane) so order 430mm wide. For spaces of 430mm between the joists (common in Melbourne) use the 450mm wide Polymax. If you are unsure please give us a call on 1300 326 627.
Q: Not all my joist spacing is the same?
A: This is normal. Every underfloor has some degree of joist spacing variation. It is inevitable that some degree of Turn and Tear installation will need to be done. Be sure to watch the installation video found under the How To tab.
Q: Is Polymax vacuum packed?
A: No it is not vacuum packed but it is squeezed tightly into a double bag (compressed). For this reason it is best to immediately open the bags when you receive them to ensure the material has time to fluff up to its natural thickness before you install.
Q: Is Polymax Underfloor Insulation easy to install?
A: The difficulty of installing underfloor insulation largely depends on your individual home. Factors like height under the floor, joist spacing, access, among other things all play a part. Feel free to reach out to us if you have any questions about the installation, email us here, or call 1300 326 627.
Q: Do you have a recommended installer for the underfloor insulation?
A: A recommended installer is highly location dependent. To find out if we have a recommended installer in your area please email us here, or call 1300 326 627.
Q: What is the underfloor insulation made of?
A: Polymax underfloor insulation is made from 100% polyester, with up to 80% of that being recycled PET (plastic bottles).
Q: Is it fire rated?
A: This excerpt is taken from the datasheet:
The following results were obtained when Polymax was subjected to early fire hazard testing in accordance withAustralian Standards AS 1530.3:
* Ignitability Index: 0
* Heat Evolved Index: 0
* Spread of Flame Index: 0
* Smoke Developed Index: 0
Q: Is there a noise reduction benefit on using the bulk insulation products
A: All insulation will have an acoustic benefit due to its density, unfortunately it is difficult to say how much because underfloor insulation is designed for thermal performance.
Q: How much improvement would underfloor insulation make?
A: Without underfloor insulation, your floorboards are the same temperature as outside, this is due to the floorboards rating is R0.7. With carpet and a great underlay, the rating is R1.0 and for many people an additional R0.3 is noticeable. When you add our underfloor insulation to your home, your floor will have a minimum rating of R3.2 with a timber floor, or R3.5 with carpeted floor. With underfloor insulation installed, your floorboards are the same temperature as inside.
Q: Does wind affect the effectiveness of underfloor Insulation?
A: Polymax underfloor insulation has a slightly more dense face. Ensure that is facing the ground. Apart from being better for stapling through it also reduces wind penetration of the insulation. Unless your underfloor is extremely windy, the wind will not penetrate the insulation. "Wind wash" is simply a marketing term.
Q: Can I cut the Polymax Underfloor Insulation?
A: Manipulating Polymax underfloor installation can be quite easy due to the manufacturer designing it to have a strong integrity when it is rolled out. It is quite easy to tear across the roll. It is impossible to tear along the roll. When installing underfloor the easy way to deal with non-standard joist spacing is by using the turn and tear method. If you prefer to trim the width of the roll you are able to that with a fine metal cutting blade attached to an angle grinder. Best not to do this under your floor. Watch this video for instructions on cutting the width of a roll.
PLEASE NOTE This method may not be desirable due to the waste that will inevitably be produced and also reducing the coverage that the underfloor insulation pack will provide.
Q: What are the dimensions?
A: There are two different variants of Polymax underfloor insulation. Please check the Specifications carefully. [Learn More]
Q: Can I return the insulation if I have ordered too much?
A: As this is custom manufactured to your order, you cannot return it. However, if you have over-ordered, please contact us and we will help you sell it via social media where the demand for polyester underfloor insulation is quite buoyant.
At a glance
Typical Coverage: 9.0m2 per bag
Cost per m2: 430mm: $16.67 | 450mm: $17.77
Dimensions: 10m x width x 140mm x 2 Rolls Per Pack
Minimum Packs per Order: 1
Made in Australia
Will underfloor insulation make a noticeable difference?
Yes—especially in homes with timber floors. Without underfloor insulation, up to 20% of your heating and cooling can be lost through the floor. You’ll likely notice warmer floors in winter, reduced draughts, and better temperature stability throughout your home - making it a smart, long-term investment for both comfort and cost savings. Many people also report needing their heater or air con less often after installation.
Is it safe and environmentally friendly?
If you’re using Polymax, yes! It’s made from 100% polyester (like a doona), contains no nasty chemicals, and won’t irritate your skin or lungs. It’s also non-toxic, low allergen, and fully recyclable—so it’s better for you and the planet. And it carries a 70 year warranty.
What is underfloor insulation made from?
Our most popular underfloor insulation, Polymax, is made from 100% thermally bonded polyester fibres—the same safe, soft material used in quilts and pillows. It contains no glass wool, formaldehyde, or itchy fibres, making it safe to touch, low allergen, and ideal for DIY installs. It’s also fully recyclable and proudly made in Australia.
Can I install it myself, or do I need a professional?
If you're reasonably handy, you can absolutely DIY underfloor insulation! Polymax is safe and itch-free to handle. We provide clear, step-by-step guides to help you through it. That said, if your floor is very low to the ground or access is tricky, you may prefer to hire a pro. Please contact us for a referral to a trusted installer in your area.
Perfect for
🔹 Keeping Your Home Comfy – Helps keep your house warm in winter and cool in summer
🔹 Saving Money – Stops heat and cool from escaping, so you don’t need to use your heater or air conditioner as much
🔹 Soft and Safe – Made from soft, non-itchy polyester insulation that won’t cause allergies
🔹 Long-Lasting Protection – Strong and stays in place. Guaranteed to work for you for 70 years
What You'll Love
100% Polyester
Made out of 100% recyclable polyester
80% recycled plastic bottles
Made out of up to 80% recycled plastic bottles
Non toxic, non itchy
Not toxic, non itchy, non allergenic, formaldehyde-free
No chemicals or glues
Heat-bonded. No binding chemicals or glues
Rodent resistant
Rats don't like to chew on it. Snug install ensures a rodent-free experience
Not impacted by water or mould
Water doesn't affect polyester. No mould issues
Fire rating NCC compliant
Fire compliant and safe
Maintains its loft
Maintains its thickness, will not collapse
Staples securely
Staples securely between joists. Suitable for variable width joists
Icons: Flaticon.com
What difference does it actually make?
Before
After