Thermally Broken Windows in Melbourne: What the Term Means and What Your Best Option Is
Thermally broken windows in Melbourne come up often in conversations about energy-efficient upgrades, particularly for homeowners comparing aluminium and uPVC options. The term refers to a specific technique used in aluminium window frames to reduce heat transfer, and understanding what it means, how it compares to uPVC construction, and where each option makes sense helps you make a better-informed decision for your home.
What a Thermal Break Actually Is
A thermal break is an insulating barrier inserted between the inner and outer sections of an aluminium window frame. Aluminium is a highly conductive metal that transfers heat readily from one side of the frame to the other. Without a thermal break, an aluminium frame can bypass the insulating gap in double glazing entirely by conducting heat through the metal itself.
A thermal break interrupts that conduction pathway by placing a low-conductivity material, usually a polyamide strip, between the two aluminium sections. This reduces, though does not eliminate, the heat transfer through the frame and improves the overall thermal performance of the window system.
Thermally broken windows in Melbourne represent a genuine improvement over standard aluminium frames, particularly for commercial applications where aluminium is preferred for structural reasons. For residential applications, however, uPVC frames offer inherently better thermal performance without requiring a thermal break component.
How uPVC Compares to Thermally Broken Aluminium
The comparison between thermally broken aluminium and uPVC frames is worth understanding in detail before making a purchasing decision.
- Thermal conductivity: uPVC has a naturally lower thermal conductivity than aluminium with a thermal break. The multi-chamber profile design of quality uPVC frames like Aluplast further reduces heat transfer through the frame, often achieving lower U-values than thermally broken aluminium alternatives.
- Maintenance: Both materials are low maintenance compared to timber. However, aluminium can corrode in coastal environments without regular cleaning and treatment, while uPVC is fully resistant to moisture and corrosion without any maintenance.
- Cost: Thermally broken aluminium windows are generally more expensive than standard aluminium but can be comparable to or more expensive than uPVC double glazed windows depending on the specification.
- Aesthetics: Aluminium offers very slim sightlines that suit certain architectural styles. uPVC profiles are slightly thicker but available in a wide range of colours and finishes that suit most residential designs.
- Long-term performance: Quality uPVC profiles maintain their thermal performance over a lifespan of 30-plus years without degradation. The polyamide insert in a thermally broken aluminium frame can age differently from the metal components over the same period.
What Astellite Recommends for Melbourne Homes
For most residential applications in Melbourne, uPVC double glazed windows deliver better overall thermal performance, lower maintenance requirements, and stronger long-term value than thermally broken aluminium alternatives. Astellite manufactures its full range using German-engineered Aluplast uPVC profiles, which achieve the performance levels needed for 7 star NatHERS ratings without requiring thermal break components.
The range covers all major window styles including tilt and turn windows, awning windows, sliding windows, bifold windows, fixed windows, bay windows, corner windows, and custom windows.
Astellite holds accreditation from AGWA and WERS, and all products meet Australian building and safety standards. Every installation is backed by a 10-year warranty. The team services homes in Melbourne, Geelong, Melton, and the Mornington Peninsula.
Get a Free Quote Today
If you are comparing thermally broken windows in Melbourne with uPVC alternatives, Astellite can help you understand the right product for your specific project. Contact us today to arrange your free measure and quote.