Best Roof Insulation for Perth Homes in 2025: Earthwool, Ametalin & More Compared
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Best Roof Insulation for Perth Homes in 2025: Earthwool, Ametalin & More Compared
Choosing the right roof insulation is one of the most important decisions you can make for your Perth home. With WA's hot, dry summers and chilly winter mornings, quality insulation keeps your home cooler, reduces your energy bills, and creates a more comfortable living environment year-round.
Whether you’re building new or upgrading an existing roof, this guide breaks down the best insulation products for Western Australia’s climate in 2025 – including Earthwool ceiling batts, Ametalin thermal break foil, and EcoTherm boards.
What to Look for in Roof Insulation for Perth
- High R-value to block out radiant summer heat
- Thermal break protection under Colorbond roofs
- Condensation control to avoid mould and moisture
- Non-combustible, low-allergen materials
1. Earthwool Ceiling Batts – R4.0 to R7.0+
Earthwool is Australia’s most trusted glasswool insulation, made with ECOSE technology for a softer, less itchy experience during install. It’s perfect for both new builds and retrofits and comes in a wide range of R-values to suit different budgets and performance goals.
- R4.0 – budget-friendly for basic installs
- R5.0–R6.0 – ideal for most Perth homes
- R7.0+ – recommended for passive builds and high-performance homes
Browse Earthwool Ceiling Batts
2. Ametalin ThermalBreak Foil
For steel frame or metal-roof homes, Ametalin ThermalBreak 8 is essential. It provides a compliant thermal break as required by the NCC, plus it reflects up to 97% of radiant heat. It doubles as sarking to protect against moisture and dust entry.
- Complies with NCC for thermal breaks
- Reduces condensation risk
- Lightweight, easy to roll out before roofing goes on
3. EcoTherm LD Foil Insulation (CSR Bradford Alternative)
EcoTherm LD Foil Insulation is a flexible, fibre-free, low-density thermal insulation product designed as a cost-effective alternative to CSR Bradford’s Space Blanket and similar foil-faced products. It's ideal for use in metal-roofed homes, sheds, and garages across Western Australia where a thermal break is required beneath Colorbond roofing.
- Low-density insulation with reflective foil facing
- Acts as a thermal break and vapour barrier
- Ideal for roof applications under tin or Colorbond
- Economical alternative to Bradford Space Blanket
This product is not a rigid board like PIR but instead comes in flexible roll form, making it easy to work with and install across joists and purlins.
What R-Value Do You Need in Perth?
| Application | Recommended R-Value |
|---|---|
| Standard Perth Homes | R5.0 or R6.0 |
| Passive Homes or Energy-Efficient Builds | R7.0+ |
| Sheds / Non-Habitable Spaces | R2.5 to R4.0 |
Roof Types and the Best Insulation Solutions
Tiled Roofs
- Earthwool R5.0 or R6.0 batts
- Add foil sarking for condensation control
Colorbond / Steel Roofs
- Ametalin ThermalBreak 8 + Earthwool batts
- Foil adds radiant heat reflection and NCC compliance
Flat or Skillion Roofs
- EcoTherm or high-density Earthwool
- Confirm available cavity space before installing
Conclusion: What’s Best for You?
Most Perth homes benefit from a mix of thermal batts (R5.0 or higher) and reflective foil. If your roof cavity is spacious and you're aiming for future energy savings, consider R6.0 or R7.0 insulation. For steel frames or Colorbond roofs, never skip the thermal break – Ametalin makes that easy and compliant.
Not sure what suits your home? We can help.
Need Help Choosing the Right Insulation?
Perth Insulation Centre offers fast delivery, trade discounts, and expert advice for builders, homeowners, and owner-builders across WA.
Visit our website or contact our team for a free quote today.