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Expol: The ultimate DIY timber floor for all seasons

Insulation acts as a barrier to the flow of heat, working to keep your home warm in winter and cool in summer. A well-insulated home can reduce your need for heating and cooling, which in turn is an effective way to reduce the greenhouse gas emissions that your home produces.

If you are investigating which timber floor insulation is the best solution for your home, check out our comprehensive guide below, which covers all of the choices available in the Australian market.

How Expol Underfloor Insulation Works

Heat naturally moves from places of high thermal energy (hot air) to areas of low thermal energy (cool air). In your home, heat continues to move around the inside until the temperature is consistent in all areas of your home.

Without proven insulation solutions such as Expol, this can become an issue in winter when the warm air escapes and leaves your home uncomfortably cold, and in summer when unwanted hot air can sit inside your home.

By insulating timber floorboards you manage the natural flow of heat throughout your home and achieve a comfortable temperature cost-effectively year-round.

Find out how much under timber floor insulation you will need.

Expol Underfloor Insulation
Home timber flooring
Expol home

Underfloor Insulation for Existing Timber Floors or New Floors

Expol is ideal to retrofit underfloor insulation and for new homes with insulation underfloor. Installation is quick and easy, and each pack comes with a complete set of instructions. Watch our installation video for installing underfloor insulation tips.

Expol is also often used in home renovation, extension or knock down rebuild projects to improve and modernise the insulation properties of existing homes.

Why choose polystyrene underfloor insulation?

Easy to install

Available nationwide

Fire Retardant

Moisture Resistant



50 Year Warranty

Branz Appraised

High Strength

Light weight & easy to install

Manufactured in Australia

Support local

Underfloor insulation foam FAQs

What sizes is Expol Underfloor Insulation available in?

Expol Underfloor Insulation rigid polystyrene panels are 1.2 metres long and 60mm in thickness and are produced in four standard joist widths (560mm, 470mm, 410mm, 360mm) to fit between most standard joists in Australian homes. All Expol panels are concertina cut on both sides to allow for a compression of up to 20mm, which makes installation quicker and easier while ensuring a snug fit between your joists.

Is Expol Underfloor Insulation fireproof?

Expol Underfloor Insulation is manufactured with a fire retardant which is an Australian building requirement for all insulation products. In the event of a fire, flame propagation is significantly slowed, if not stopped.

Where is Expol Underfloor Insulation made?

Expol Underfloor Insulation is a 100% Australian made insulation solution. All Expol products are manufactured to the highest quality standards at Foamex owned and operated facilities in Australia.

Is Expol Underfloor Insulation recyclable?

Yes, Expol is a sustainable insulation solution and is a 100% recyclable product. In fact, Expol’s manufacturer Foamex is one of the largest recyclers of EPS in Australia.

How much does Expol Underfloor Insulation cost?

The cost of Expol Underfloor Insulation will vary depending on the size of your house and which Expol product you need. To help you get an accurate estimate to insulate your home, Find out how much under timber floor insulation you will need.

Customer Reviews

I'm very happy with the end result, we didn't use our heater half as much after the Expol insulation was installed and our baby boy crawling around the floor probably noticed the most difference, without getting such cold hands and knees. We are very happy with the product and service provided.


We are very happy with the installation of Expol, even though it's only been a bit over a week since it was installed we have noticed a big difference & find we are turning the air conditioner off about 1 hour before going to bed because the lounge room is so warm, which we have never done before. I would have no hesitation in recommending your product & your service, which was excellent.


Up to 20% of heat loss occurs through your floors. Make your home more energy efficient and save on power bills