5 Home Insulation Myths Debunked

Insulation is one of the most effective ways to improve comfort, energy efficiency, and long-term savings in your home — especially in Perth’s hot summers and cool winters. But there are still plenty of outdated ideas floating around. Let’s clear the air by busting 5 of the most common home insulation myths (including the one about over-insulating!).

Myth 1: "You Can Over-Insulate a House"

This is one of the most common concerns — and one that’s often misunderstood. The truth is: you can’t really over-insulate if your home is properly ventilated.

Modern insulation products like Earthwool ceiling batts are designed to work with your home’s ventilation system. The key is striking the right balance between thermal resistance (R-value) and airflow.

If you're sealing every single gap without accounting for airflow (especially in older homes), that’s where moisture issues can arise — not because of “too much insulation,” but because of poor ventilation design.

Myth 2: "All Insulation Is the Same"

There are huge differences in material, R-value, acoustic performance, and environmental impact between insulation types. For example:

• Earthwool insulation is made using up to 80% recycled glass and ECOSE® Technology — no added formaldehyde or artificial dyes.
• Foil insulation works best in combination with bulk insulation for radiant heat control.
• Older insulation materials may not meet modern standards for energy efficiency.

That’s why it’s important to choose the right insulation for each area of your home — roof, wall, or floor.

Myth 3: "Insulation Only Matters in Winter"

This couldn’t be further from the truth — especially in Perth! In fact, the hotter the climate, the more important insulation becomes.

In summer, roof spaces can exceed 60°C. Without proper insulation, that heat transfers straight into your living spaces. High-R-value products like the Earthwool R7.0 Thermal Ceiling Batts help keep the heat out, reducing your need for air conditioning — and your energy bill.

Myth 4: "Old Insulation Is Still Doing the Job"

Just because you have insulation doesn’t mean it’s effective. Over time, insulation can:

• Settle or compress (especially in ceilings)
• Lose thermal resistance
• Become damp or rodent-damaged

If your insulation is 15+ years old, it’s worth checking whether an upgrade is needed. Newer products are not only more efficient — they’re often easier to install and safer to handle.

Myth 5: "Insulation Is Only for New Homes"

Wrong again. Retrofitting insulation into existing homes is one of the best ways to improve energy performance. Whether you’re adding wall insulation behind plasterboard or laying underfloor batts beneath timber floors, the benefits of retrofitting are huge — especially in older Perth homes built before energy efficiency codes existed.

Final Thoughts: Don't Let Insulation Myths Hold You Back

Insulation myths cost homeowners comfort, efficiency, and money. The reality is that modern insulation — when properly installed and chosen for your climate — makes a huge difference all year round.

Need help finding the right product? Explore our full range of insulation solutions at Perth Insulation Centre or call us on 0417 910 326 for expert advice.

Insulate smarter. Save more. Live better.