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 Type Product Example Best For Key Features
Glasswool Batts Pink Batts Floor Insulation Batts Excellent thermal insulation Energy efficiency, soundproofing, moisture resistance
Polyester Batts Greenstuff Polyester Underfloor Insulation, Bradford™ Polymax Acoustic Insulation Batts Safe, thermal & acoustic insulation Good thermal & soundproofing, high moisture resistance
Polyester Rolls Polyester Solutions Underfloor Insulation Roll DIY-friendly, flexible installation Good thermal & acoustic properties, high moisture resistance
Foil-Faced Acoustic Insulation AngelStep Gold4 & Gold8 – Acoustic Premium soundproofing & heat reflection Reflects radiant heat, very high soundproofing, moisture resistance
Soundproofing Panels AngelStep 220, 48P, 630 – Acoustic Apartments, vinyl floors & carpet tiles High soundproofing, thermal insulation, moisture resistance
High-Performance Thermal Insulation Kingspan Aircell Permifloor Insulation, Kingspan Aircell Permifloor 500 Insulation High energy efficiency & floor insulation Great thermal insulation, soundproofing, high moisture resistance
Rigid Floor Insulation Board Kingspan Kooltherm K3 Floor Board, Expel Polystyrene Underfloor Insulation High-performance thermal insulation Excellent thermal insulation, soundproofing, high moisture resistance
Earthwool Insulation Knauf Earthwool Underfloor Insulation Batts Natural, low-itch insulation Good 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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