Expol Underfloor Insulation R1.4

Underfloor Insulation for New & Existing Floors

Expol Underfloor Retrofit Existing Homes

Expol Underfloor Insulation by Foamex is a cost-effective way to improve your home’s comfort and energy efficiency by creating a thermal barrier that stops heat entering in summer and escaping in winter. Manufactured in Australia using high-quality expanded polystyrene (EPS) — and, where possible, incorporating recycled content — Expol contains flame retardant, is CFC-free, and designed to compress snugly between timber floor joists with concertina cuts allowing up to 20mm of flexibility.

Suitable for both new and existing homes, Expol is non-allergenic, safe, and easy to install. Any offcuts can be returned to Foamex for recycling, supporting a closed-loop process and reducing waste.

Available from leading hardware stores and directly from Foamex.

Why Choose Expol Underfloor Insulation?

Creates a reliable thermal barrier to reduce heat loss in winter and heat gain in summer.
Manufactured in Australia to strict quality standards using expanded polystyrene (EPS).
Incorporates recycled content where possible and all offcuts are fully recyclable through Foamex.
Lightweight and easy to handle — ideal for DIYers and professional installers alike.
Snug fit between floor joists with up to 20mm compression thanks to concertina-cut panels.
Non-allergenic, water-resistant and contains flame-retardant for safe and long-lasting performance.
Suitable for new builds, retrofits under-timber floors.
Helps reduce energy bills by improving overall home insulation and comfort.
Backed by a 50-year product warranty for peace of mind.

Expol- Underfloor Insulation

New & Existing Timber Floors

Whether you’re building a new home with a suspended timber floor or retrofitting an existing one, Expol Underfloor Insulation delivers an efficient, long-term solution to reduce heat loss and improve comfort. While most builders specify ceiling and wall insulation, underfloor insulation is often overlooked — yet homes can lose up to 20% of heat through the floor. Installing Expol during the build phase is ideal, but it can also be added later as a retrofit with minimal disruption. Designed to fit snugly between timber joists, Expol protects against drafts, cold air and moisture from below, helping maintain a consistent internal temperature year-round.

Expol White R1.4

Expol White R1.4 is a rigid EPS (expanded polystyrene) insulation panel designed to deliver reliable thermal performance for standard residential applications. It’s ideal for homes with suspended timber floors and exceeds the minimum insulation requirements under the National Construction Code. With an R-value of 1.4 and concertina-cut edges that compress up to 20mm, it installs easily between joists at 410mm, 470mm or 560mm spacing.

Expol Black R1.8

For colder climates or homeowners seeking maximum energy savings, Expol Black R1.8 offers enhanced thermal performance thanks to its advanced graphite-infused EPS core — delivering up to 30% more efficiency than Expol White. With an R-value of 1.8, it’s ideal for energy-conscious builds or upgrades where improved comfort and sustainability are priorities. Currently available in a 410mm width, Expol Black fits snugly between timber floor joists and features the same durable, concertina-cut design for flexibility and precision. Expol Black is available to order directly from Foamex and online in select regions including Victoria and South Australia. Custom manufactured sizing also available.

Accessories

EXPOL WireGuard Insulation Roll

Protect your electrical cables with WireGuard — a waxed adhesive paper strip that prevents contact between EPS panels and wiring. Simple to install and essential for safety when Expol insulation is used around electrical cables in floors and subfloors.

EXPOL Joist Saddles – New Floor Builds

Speed up your underfloor installation with Expol Joist Saddles. Designed for new builds, these durable saddles hold panels in place from above the joist, saving time and ensuring correct positioning before floorboards or sheeting are laid. Pack of 50.

EXPOL Z Clips – New & Existing Floors

Quick-fit Z Clips make installing underfloor insulation even easier. No nails needed — just push into place between the joist and panel. Use two clips per panel to secure Expol insulation snugly and safely. Suits both new and existing floors.

WHITE R1.4 BROCHURE

BLACK R1.8 BROCHURE

Technical Specifications

FAQ's

Frequently Asked Questions Expol Underfloor Insulation

What is the R-value of Expol Underfloor Insulation?

Expol Underfloor Insulation is available in two options: Expol White with an R-value of 1.4 and Expol Black with an enhanced R-value of 1.8. Both options help meet or exceed the minimum requirements under the National Construction Code.

Can Expol Underfloor Insulation be installed in existing homes?

Yes. Expol Underfloor Insulation is ideal for retrofitting existing homes with suspended timber floors. It fits snugly between joists and can be installed from underneath with L Brackets or Z Clips to hold the panels in place securely.

Is Expol Underfloor Insulation safe to install?

Absolutely. Expol is made from expanded polystyrene (EPS), which is non-allergenic, lightweight, easy to handle, and manufactured with a flame retardant. It’s safe for both professional installers and DIY users.

Where can I buy Expol Underfloor Insulation?

Expol is available from leading hardware stores across Australia and can also be purchased directly through Foamex. For added convenience, Expol Black R1.8 is available online in select regions including Victoria and South Australia.

Is Expol Underfloor Insulation environmentally friendly?

Yes. Where possible, Expol contains recycled material and all offcuts can be returned to Foamex for recycling. EPS is resource-efficient, using minimal raw material and delivering substantial thermal energy savings over its lifespan.