Which is Right for Your Home?
If you’re deciding between uPVC and aluminium for your doors and windows, it’s essential to know the key differences in performance, cost, and aesthetics. Below, we break down the pros and cons of each material to help you make an informed choice for your home.
How Do Aluminium and uPVC Compare? As the most popular window material in New Zealand, aluminium has its strengths, but there are several aspects where uPVC excels. A direct comparison on thermal performance, noise reduction, cost, and appearance reveals why uPVC is often the best choice for New Zealand homes.
1. Thermal Performance
uPVC
Known as the most thermally efficient joinery material available, uPVC uses a plastic frame with internal air chambers that prevent heat and cold from travelling through. This design minimizes condensation on the frame and, with adequate ventilation, on the double glazing as well. Its R-value starts at 0.41, increasing to 0.84 with Low-E glass and argon gas. Standard uPVC also comes double-glazed, with a double rubber gasket and drainage system ensuring complete watertightness and airtightness.
Aluminium
Aluminium, being a highly conductive metal, allows outside temperatures to influence the indoor environment easily. Even with double glazing, it lacks the insulation properties of uPVC, which can result in condensation issues. While thermally broken aluminium reduces conductivity, it does not entirely prevent it. The R-value of aluminium is lower at 0.26, or 0.31 if thermally broken. That said, aluminium is highly watertight and airtight.
2. Noise Reduction
uPVC
Recent tests in Australasia show that Aluplast uPVC joinery can reduce noise transmission by up to 35dB, which helps create a peaceful indoor space, particularly in busy areas.
Aluminium
The type of glass used contributes to noise reduction, but aluminium frames themselves conduct sound. While thermal breaking helps, it does not eliminate sound conduction completely.
3. Lifespan
uPVC
With a lifespan of over 40 years, uPVC is resistant to corrosion and warping, requiring minimal maintenance. It includes a 15-year BRANZ guarantee on the uPVC, a 10-year guarantee on the glass, and a 5-year guarantee on handles and hardware. Titanium dioxide treatment reflects UV rays, and a steel internal structure adds strength and rigidity.
Aluminium
While durable, aluminium has a shorter lifespan. Pitting, corrosion, and separation at the frame corners (mitres) are common issues. Security can also be a concern, as rubber seals on aluminium frames can sometimes be removed from the outside, allowing access to the glass.
4. Appearance
uPVC
uPVC is versatile and can fit most architectural styles, from character homes to new builds. However, its bulkier profile may not suit all designs, as it houses extensive thermal technology. Colour options in New Zealand are more limited, with white as the standard; custom colours are available but require a special order from Germany, with a lead time of 3-6 months.
Aluminium
Aluminium has a sleek profile and a wider colour range, making it well-suited for modern builds with bold architectural concepts. Its slim, customizable frame can be made in almost any shape, although it may not always complement the look of older character homes.
Conclusion
Aluminium joinery has its place in New Zealand, but at Eco Manawatu, we believe uPVC windows and doors consistently provide superior quality and cutting-edge technology for energy-efficient, durable, and sound-insulated home joinery.