4.8/5 stars based on 550+ reviews

Product details

Description

Made from 100% non-irritating polyester, these rolls are safe to handle with no itch, no loose fibres, and no harmful chemicals—making installation easy for DIYers, owner-builders, and professionals alike. Polymax insulation snugs securely between floor joists, reducing heat loss, blocking draughts, and dampening noise from below. Whether you're insulating a new build, renovation, or existing home, this durable, eco-friendly solution will help maximise comfort and energy efficiency

✅ Superior thermal insulation – Warmer in winter, cooler in summer.

✅ Blocks underfloor draughts – Helps reduce energy loss & lower power bills.

✅ Non-itch, no loose fibres – Safe & easy to handle.

✅ Eco-friendly & non-toxic – Free from harmful chemicals.

✅ Excellent acoustic insulation – Reduces noise transfer through floors.

✅ Fits snugly between joists – No sagging, long-lasting performance.

✅ Ideal for renovations, retrofits & new builds – Perfect for homeowners & builders. Upgrade your home’s comfort with Polymax Underfloor Insulation—shop now!

At a glance

  • Typical Coverage: 9.0m2

  • 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

Frequently Asked Questions

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.

Load video:

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

What difference does it actually make?

Before

After

Customer Reviews

Based on 2 reviews
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Tom Radtke
Underfloor insulation - Worth the wait

A cold 80's beach shack on poles, with virtually no insulation,an underfloor joist spacing (of nominally 400mm) I went with the polymax R2.5 (which is available in a 430mm roll width) insulation and self installed. Very happy with the result. The Polymax product took a little longer to arrive because it is made to order, but installation was relatively straightforward (I used a Ryobi staplegun and Arrow T50 10mm staples). Importantly - it works and I can definitely feel the difference in the house. Thanks to the EcoMaster team for helping me with the purchase and for delivery.

Hi Tom,
We can only imagine how cold the home was before installation...bbbbrrrr! but as you said - 'it's worth the wait' - and we totally agree because Polymax Polyester Insulation is a beautiful product! We are very happy to hear that it has now made a real difference in your homes comfort level.
We appreciate your business and look forward to being able to help you again sometime soon. Thank you for your review!

H
Harley V.
Great product

I ultimately chose this polyester insulation due to its greater density which should also provide better sound insulation as well as the R2.5 thermal insulation. One side of the batt is slightly more dense in the first 5 - 10mm giving me greater confidence to staple through the batt and have it remain securely fixed in place.

It was a pleasure dealing with Ecomaster, and I found the YouTube videos really helpful. Looking forward to dealing with Ecomaster again when we come to insulate our walls.

Hi Harley,

We do all we can to provide our customers with the best service, and it always makes our day when a customer appreciates it. We hope to make your next visit with us just as positive.
Have an amazing day!