Underfloor Insulation

What is Underfloor Insulation?

Underfloor insulation generally refers to insulation to underneath the ground floor of a home.  This is not to be confused with under soffit, under slab or between floors insulation.

It prevents cooling and heating from escaping through the floors. Even a sealed floor will allow the cold and heat to pass through because of the materials thermal transfer. The bigger the temperature difference between inside and outside, the more you’ll notice that you need underfloor insulation.

How to Choose the Best Underfloor Insulation

The right under floor insulation depends on your floor type, climate, and personal needs.

Insulation TypeProduct ExampleBest ForKey Features
Glasswool BattsPink Batts Floor Insulation BattsExcellent thermal insulationEnergy efficiency, soundproofing, moisture resistance
Polyester BattsGreenstuff Polyester Underfloor Insulation, Bradford™ Polymax Acoustic Insulation BattsSafe, thermal & acoustic insulationGood thermal & soundproofing, high moisture resistance
Polyester RollsPolyester Solutions Underfloor Insulation RollDIY-friendly, flexible installationGood thermal & acoustic properties, high moisture resistance
Foil-Faced Acoustic InsulationAngelStep Gold4 & Gold8 – AcousticPremium soundproofing & heat reflectionReflects radiant heat, very high soundproofing, moisture resistance
Soundproofing PanelsAngelStep 220, 48P, 630 – AcousticApartments, vinyl floors & carpet tilesHigh soundproofing, thermal insulation, moisture resistance
High-Performance Thermal InsulationKingspan Aircell Permifloor Insulation, Kingspan Aircell Permifloor 500 InsulationHigh energy efficiency & floor insulationGreat thermal insulation, soundproofing, high moisture resistance
Rigid Floor Insulation BoardKingspan Kooltherm K3 Floor Board, Expel Polystyrene Underfloor InsulationHigh-performance thermal insulationExcellent thermal insulation, soundproofing, high moisture resistance
Earthwool InsulationKnauf Earthwool Underfloor Insulation BattsNatural, low-itch insulationGood thermal & soundproofing, high moisture resistance

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Climate Considerations

Cool-Temperate Climate (Melbourne):

  • Cold winters and mild summers mean higher R-values (R2.5 – R3.5) are ideal to retain warmth efficiently.
  • Glass wool batts or polyester rolls provide excellent thermal insulation 

Warm-Humid Climate (Brisbane & Gold Coast):

  • Hot, humid summers and mild winters require breathable insulation that allows airflow while preventing moisture buildup.
  • Polyester insulation rolls are a great choice as they are moisture-resistant and mold-resistant.
  • Reflective foil insulation can be used to reduce heat buildup in summer while maintaining comfortable temperatures year-round.

Signs Your Home Needs Underfloor Insulation

Here are the top signs you should insulate your floors:

✔️ Your floors feel cold even when the heater is on
✔️ Your energy bills are increasing despite heating/cooling adjustments
✔️ You feel cold drafts around your feet
✔️ Uneven room temperatures – Some areas feel much colder than others

We offer a wide range of underfloor insulation products to suit different climates and energy efficiency goals. For standard applications, our R2.0 underfloor insulation is a popular choice, providing solid thermal performance and comfort. If you’re building in colder regions or want higher insulation performance, our R2.5 underfloor insulation delivers greater resistance to heat flow, helping reduce energy costs year-round.

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