When homeowners think about insulation, the attic and walls usually come to mind first. However, one critical area often overlooked is the floor, especially if your home has a crawl space or is built on piers. Installing underfloor insulation can dramatically boost your home’s energy efficiency, comfort, and HVAC performance year-round.
Why Insulating Your Floor Matters
Your floor is a major conduit for heat transfer. In fact, up to 15% of your home’s heat can be lost through an uninsulated floor to the cold ground or crawl space below.
In summer, that same uninsulated space allows warm, humid air to seep into your living environment, forcing your air conditioner to work harder and often creating a damp, musty smell.
By adding insulation beneath your floorboards, you create a robust thermal barrier that delivers year-round benefits:
1. Consistent Temperature Control
Polyester underfloor insulation significantly reduces heat transfer, ensuring that the temperature you set on your thermostat stays inside your living space.
- In Winter: Floors feel warmer underfoot, eliminating cold drafts and keeping heat trapped indoors.
- In Summer: Insulation blocks heat and humidity from rising up, making it easier and cheaper to cool your home.
2. Reduced Energy Bills
With polyester insulation, your heating and cooling systems don’t need to run as often or as long. This means:
- Lower energy consumption
- Reduced strain on your HVAC system
- Significant savings on your utility bills
3. Moisture and Mold Management
Crawl spaces are damp, musty, and a breeding ground for mold unless properly sealed. Moisture rising through an uninsulated floor leads to:
- Higher indoor humidity
- Musty odours
- Risk of mold and mildew that can affect your family’s health
- Polyester insulation is moisture-resistant, helping protect your home, subfloor, and joists from rot and long-term damage.
Why We Use Polyester Insulation
At 1STOPINSULATION, we specialise exclusively in polyester underfloor insulation using the floor block method. Here’s why polyester is the superior choice for Victorian homes:
Non-toxic and non-irritant – safe for families, pets, and allergy-sensitive households Moisture and rodent resistant – won’t sag, deteriorate, or attract pests Durable and long-lasting – holds its shape for decades with no settling Thermal comfort guaranteed – significantly reduces heat loss and improves year-round comfort Fully NCC-compliant – meets or exceeds Australian building standards
The Bottom Line
If your floors feel cold in winter or your home struggles with damp, musty air in summer, upgrading to polyester underfloor insulation is one of the most effective steps you can take.
Don’t let up to 15% of your heating and cooling disappear through the floor. Seal it in and enjoy the savings!
Ready to Upgrade?
At 1STOPINSULATION, we offer free underfloor assessments to determine the best solution for your home.
Polyester insulation supplied and installed
Installed by trained in-house professionals — no subcontractors
Fully NCC-compliant and backed by long-term performance
Call us today on 0404 412 111 or visit 
1stopinsulation.com.au to book your free quote.
Frequently Asked Questions About Underfloor Insulation in Victoria
In Victoria, up to 15% of a home’s heat can be lost through an uninsulated floor, especially in older homes with crawl spaces or timber floors.
Yes. Polyester insulation is non-toxic, non-irritant, and allergy-friendly, making it one of the safest insulation products available for households with children and pets.
Absolutely. In winter, it keeps floors warmer and reduces drafts. In summer, it prevents warm, humid air from rising up into your home — keeping your living space cooler and reducing strain on your air conditioner.
Polyester insulation is extremely durable and long-lasting, often performing for several decades without sagging, deteriorating, or losing effectiveness.
Yes. Crawl spaces in Victoria are often damp and musty. Polyester underfloor insulation is moisture-resistant, helping prevent mould, mildew, and rot while improving air quality inside your home.
Professional installation is critical. At 1STOPINSULATION, we use the floor block method, ensuring a secure, friction-fit installation that complies with the National Construction Code (NCC) and delivers full coverage for maximum performance