Expol Black Underfloor Insulation R1.8



With Expol Underfloor R1.8 Black Insulation, you can take action to reduce your energy bills and contribute to a cleaner environment by reducing your carbon footprint. This high-performance insulation is made with graphite, which makes it 30% more thermally efficient than Expol White R1.4. Designed to be used in extreme environments, so you can be sure that your home will stay warm and comfortable all year round.

As of now, the available size is designed to fit 410mm joists, ensuring a perfect match for your underfloor needs. With its superior insulation properties and easy installation, Expol Black R 1.8 is an excellent choice for enhancing energy efficiency and comfort in your home.

Expol Underfloor R1.8 Black Insulation is:

  • Ideal for any home:
    Expol Underfloor Insulation is the perfect solution for any home, whether you’re looking to retrofit your existing floor or install new flooring. Expol Underfloor  R1.8 is backed by a 50-year EXPOL product warranty, so you can be sure that it will last for many years to come.
  • Available to buy online in Victoria & South Australia:
    Expol Underfloor R1.8 Black is currently available in a 410mm width and can be ordered online or via special order at Bunnings. The boards have been engineered with concertina edges that can be cut to size to further ensure a perfect fit.
  • Quick and easy to install:
    Expol Underfloor R1.8 Black Insulation is quick and easy to install, so you can get started on your home improvement project right away. This insulation is also lightweight, so it is easy to move into place. It is designed for new and existing timber floors and fits snugly in-between timber floor joists to stop drafts and damp from entering your home.
  • Long-lasting and energy-efficient:EXPOL Underfloor Insulation is long-lasting and energy-efficient, so you can save money on your energy bills for years to come. Its material composition will help to keep your home warm and dry, which is healthier for you and your family. Expol Black R1.8 is a rigid polystyrene board that has been infused with graphite, so it won’t sag over time. It is also flame retardant, vermin resistant and helps reduce noise from timber floors.
Expol Black R 1.8 underfloor insulation is now conveniently accessible online. Additionally, leading hardware stores offer the option of special ordering this cutting-edge insulation product. Just call them and ask! (Victoria & South Australia only)

The benefits:

  • 30% more thermally efficient than EXPOL R1.4 White Insulation
  • When possible, can contain up to 30% recycled content and can be easily recycled
  • Flame retardant
  • Rigid board so won’t sag over time
  • Available in 410mm.
  • Easy to Install with concertina cuts which allow for compression of up to 20mm
  • Resistant to moisture – perfect for flood zones
  • No nutritional value to vermin, birds or animals
  • Ideal for both retro-fit applications and new floors
  • Comes with a 50 year product warranty

EXPOL R1.8 Black can be easily recycled. Simply return your offcuts or unused boards to a StyroCycle drop off bin.



All EXPOL timber floor insulation solutions comply with the Australian and New Zealand Standard AS/NZS 4859.1:2002.

If you live in a climate with extreme temperature variations and would benefit from a product with a higher R-Value, check out Expol Underfloor R1.8 Black. Infused with graphite to make it 28% more thermally efficient, Expol R1.8 works effectively in both extreme heat and extreme cold conditions to maintain consistent indoor temperatures.

Time to enjoy warmer feet and
save up to 12% on your heating bill.