4.8/5 stars based on 550+ reviews

Product details

Description

Made from 100% non-irritating polyester, these batts 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 5 reviews
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Robert Morton
Great product

I bought the Polymer R2.5 polyester underfloor insulation (10 packs) in March to install under our timber floors. Install was straightforward with helpful video advice provided by ecoMaster. My only gripe is that the product went on sale shortly after my purchase, so I paid $530 more for my insulation, than if I had waited a few weeks before ordering.

S
Sarah Hallett
What a difference!

I already had wall and ceiling installation. The addition of floor insulation has made another noticeable difference. The heater clicks on less often, holds the heat longer. My house doesn't feel as cold! It was easy enough to install ourselves.

Thank you for your great 5 star review Sarah. We really appreciate your business and helping to share the word about ecoMaster and our products. The entire team are delighted to hear that they have helped to make your home warmer and noticeable more comfortable.

M
Marlon Leicester
Excellent product and easy to work with

My home's subfloor is low enough that I couldn't find any tradesperson to insulate it, so decided to DIY it. Needless to say, it's a miserable process, but that's got nothing to do with this polyester insulation. In fact, if the insulation wasn't so good I would have given up. It's positively pleasant to work with, tears only in one direction, just as advertised, and isn't irritating whatsoever. The scraps make perfect pillows to lie on while working in the subfloor. Haven't finished the whole house but under bare feet, I can already feel the difference in floor temperature in the insulated areas.

Thanks Marlon. We are glad that you are now feeling the difference in floor temperature despite not having the entire house insulate yet. Good choice with the DIY.