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Polymax R2.5 | NSW Sydney | Polyester Underfloor Insulation

Polymax R2.5 | NSW Sydney | Polyester Underfloor Insulation

Underfloor Insulation

Regular price $240.00
Regular price $318.00 Sale price $240.00
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Tax included. Shipping calculated at checkout.
  • 100% Polyester
  • Made from 45% recycled plastic bottles
  • Not itchy, non toxic, non allergenic
  • Australian Made
  • Returns within 30 days


Timber floors can have a natural beauty when polished but they can feel quite cold in winter and unnecessarily warm in summer. This not only makes them uncomfortable, but it also causes more energy use to combat the discomfort, more heating in winter and more cooling in summer.  Even carpet and underlay only adds the tiniest amount of insulation value to wooden floors.

The answer is to insulate your floor with Polymax polyester rolls. Polymax is made by CSR Australia, especially for Australian wooden floors. 

Non-Toxic & Non-Irritant: allowing for people-friendly installation without the need for gloves, specialised equipment or glass splinters embedded in your skin

Eco-Friendly & Sustainable: made from minimum 40% recycled plastic bottles

Hydrophobic:  Not impacted by water spills.  If it gets wet, it will dry out and not need to be replaced

Fire Resistance: polyester insulation is a non-flammable material due to its self-extinguishing properties that prevent it from catching fire and it will not carry a flame

Noise Reduction: as an added bonus it will also help provide a sound barrier to reduce noise

High R Rated Insulation:  R2.5 underfloor is standard

Comes in Two Widths: Making it easier to get your project done.

Australian Made: Manufactured by Bradford CSR, and brought to you by ecoMaster, a well known Australian energy efficiency business.

AU/NZ Building Code: is compliant with Australia/NZ building insulation regulations

    The best, most cost effective way to insulate your floor is to do it yourself. That's why we have produced easy-to-follow "How to" videos" for you to Do it Yourself. 

    Polymax underfloor insulation comes in two different widths. To make sure you order the correct width for your project.  Be sure to check out the Specs tab.



    • 100% Polyester
    • Contains up to 80% recycled component
    • Non irritant, non-toxic, non-allergenic, and non-respirable.
    • No itching, no glass fibres in your skin, eyes or lungs.
    • Maintains its loft (thickness) for the lifetime of your home
    • Can be firmly secured between the joists with staples 
    • Hydrophobic, does not hold moisture
    • Not affected by mold or mildew
    • Rodent resistant – rats and mice don’t like it, won’t eat it, and won’t nest in it
    • Non flammable – will not hold a flame
    • Heat-bonded, with no binding chemicals or glues
    • Formaldehyde-free
    • ISO9001 Quality Certification
    • ISO14001 Environmental Management System Certification
    • 70 years Durability Warranty
    • Manufactured in Australia
    • Made for Australian wooden floors


    • Helps make your home warmer in winter and cooler in summer
    • Reduces energy costs by up to 20% while improving comfort
    • Prevents draughts from coming up through your floor boards 
    • Perfect for allergy sufferers as it is non toxic and non allergenic
    • Improves the value of your home
    ecoMaster's polyester subfloor insulation is rated at R2.5, which achieves an overall rating of R 3.2 (without carpet) or R 3.5 (with carpet).



    Width 450mm 430mm
    Product R Rating R2.5 R2.5
    Pack Type Standard Narrow
    Area Per Pack 13.4m2 8.62m2
    Typical Coverage 13.4m2 9.0m2
    Rolls Per Pack 3 2
    Length Per Roll 10 metres 10 metres
    Loft/Thickness 140mm 140mm
    Size of Pack Height 1350mm 860mm
    Size of Pack Diameter 700mm 700mm
    Weight ~24Kg ~15Kg
    Material Polyester 100% 100%
    Material Recycled Poly 80% 80%
    Manufactured Australia Australia
    Apha W 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:


    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: Can I get a sample?
    A: Yes. There is an underfloor insulation sample kit available. 
    The cost of the sample kit is refunded when you purchase your underfloor insulation from ecoMaster.

    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. 


    Q: How will my order be delivered?
    A: We will contact you to advise when your order can be manufactured and delivered to your home.  

    Q: Where can you deliver to?
    A: Orders can be delivered to just about anywhere within Australia. However, the freight costs can become relatively high if you are in a regional or remote area. Please contact us with your location for a freight quote. 

    Consider collaborating with your neighbours to share an order as the freight price is the same whether there are a few bags or the truck is filled to capacity.

    Q: Can I collect my order from the Sydney manufacturing plant? 
    A: Yes, you can.  When your order is ready for collection, you will be advised.

    Q:  Can I get a return excess insulation?
    A:  No.  All Polymax orders are "made to order" and cannot be returned.  If you can excess insulation, please contact us and we will help you sell it via social media.  There is a buoyant market for polyester insulation.


    Q: What is the product warranty for all the insulation products in the Sample Kit?
    A: Polymax carries a product warranty of 70 years, Greenstuff and Value Poly both carry a 50 year warranty.
    However, all three brands can be highly effective for much longer than that. We have not yet seen a 'failed' polyester product.
    It is incredibly robust and is not damaged by the elements that would generally damage other types of insulation such as rodents and water / storm damage. 

    Q: What is the installation warranty?
    A: As these are DIY products there is no warranty on installation.  

    If you have any questions, contact the ecoMaster team. We are all ex-installers and have done this work thousands of times before. We are here to help you.


    View full details

    Customer Reviews

    Based on 10 reviews

    When it works it is convenient to install but firstly I thought I was getting 3 rolls per pack (as per the 450mm and picture) but I ended up getting 2 per pack because I didn't notice the fine print so I don't have enough product and ended up going to Bunnings for the rest. Then I found out that the 10m rolls I thought I was getting are actually 9.2 - 9.5m so I have even less than I thought. This is in the process of being resolved which they have been good about, but still not resolved.

    What I really need is the 500mm width rolls for a small area of my project, but they only supply > 200m2 of this width so I have to do something else there. Of course it is the most difficult bit of the project, so I didn't realise the joist widths there are different from the rest.

    In all if I'd known about all these issues I wouldn't have started but now I'm stuck with 5 rolls of the stuff (thought I was getting 15, have put in 5) that I need to put somewhere so I'm trying to complete. It's an old kitchen so I expected issues and tried to make it easy for myself but this is too much. I'm not sure I'm going to be able to staple it down because I've had enough.

    The good things - not itchy, easy to work with when joist widths correct, feel happier about avoiding wiring issues than the other stuff, doesn't burn.

    Hi Liz,

    Thanks for your review.

    As part of the resolution you alluded to, we have sent you an additional pack of insulation free of cost to make up for those rolls that were shorter than the 10m specified. The Manufacturer takes such discrepancies in their product seriously and we at ecoMaster take them even more seriously.

    I'm sorry to hear that you did not get the number of rolls expected. We do go to great efforts to make all relevant information about our products available on our webstore; Each one of our products have 'How To' and 'FAQ' sections that demonstrate the ins and outs of measuring joist spacings and installing insulation.

    The products also have the 'Specs' section, which thoroughly documents the specifications of our product including its sizing. These sections are readily visible just under the photos of our products and are alluded to in the Description of the Product too.

    Under some circumstances Insulation manufacturers will make custom sized insulation. As this is a bespoke solution the minimum order quantities are high to ensure the logistics of the manufacturer are un-hindered. Typically a domestic residence is not large enough to justify the cost of bespoke sized insulation.

    As a result, the way that professional install crews manage varied joist spacings is by using the “Turn and Tear” method. This is done by installing the insulation rolls in segments perpendicular to the joist. Indeed this is the way we here at ecoMaster handled this quite common occurrence on over 10 000 underfloor insulation instals.

    In the case that our documentation is not ample information, our sales and support staff are ready for all possible questions. Give your helpful ecoMaster team a call on 1300 326 627

    Jose Rodrigues
    Polyester Insulation

    Great product easy to install

    Thank you for your terrific 5 star rating Jose. Hearing that our customers think that our insulation is such a great product that's easy to install is what we strive for.
    Appreciate you sharing.

    Andrew Darbin
    Tops for Underfloor insulation

    What a TOP product, light and flexible to work with when crawling around under my house. Zero itching and scratching breath easy product. Made a quality improvement to the family home. Highly impressed.

    We are very pleased to hear that our underfloor insulation has made a real difference to your homes comfort level Andrew. Thank you for sharing your 5 star review

    Con Stefanidakis
    Polymax R2.5

    Great work ecoMaster. I purchased a substantial quantity of PolymaxR2.5 from the ecoMaster team. The customer service and advise I received from the team was excellent. Even when I had a small issue with one batch of the product the team were straight onto it and organised replacement product immediately. Having had the Polymax installed for a couple of weeks now I must say it has made a noticeable difference to the comfort of my home.
    Thank you again ecoMaster.

    Thanks for the feedback Con!

    Glenn F.
    Great service great product

    Fast response
    The difference in our house heating was noticeable as soon as we finished.
    Working with polyester, too easy

    Thank you Glenn!