uPVC Windows vs Aluminium: What Works Best in Coastal Areas?
Choosing the right windows is a key decision in coastal architecture. Homes near the sea face persistent challenges like salt-laden air, heavy humidity, and sudden shifts in weather. In this environment, both uPVC windows and aluminium windows are popular, but their performance varies depending on climate conditions and homeowner expectations.
This blog explores critical differences between aluminium and uPVC windows in coastal applications, offering clear insights for property owners and architects alike.
1. Performance Against Salt and Moisture
uPVC windows are made from unplasticized polyvinyl chloride, a moisture-resistant material that doesn’t rust. While this offers decent protection in humid areas, long-term exposure to UV rays and salty air can cause surface degradation unless high-grade stabilizers are used in manufacturing.
Aluminium windows, when coated with powder or anodized finishes, resist corrosion effectively. They maintain surface strength and color even after prolonged exposure to coastal elements, making them well-suited for high-salt zones.
2. Structural Strength in Wind-Heavy Zones
Strong wind pressure is common near coastal regions. uPVC windows, especially larger ones, often rely on internal steel reinforcements to maintain form. However, the material itself can warp slightly with temperature swings, affecting seal tightness and frame integrity over time.
Aluminium, by nature, offers higher structural stability. The material allows for narrower yet stronger profiles, enabling larger glass spans and better load-bearing capacity in cyclone-prone coastal belts.
3. Energy Efficiency and Insulation
One of the top reasons why upvc windows are widely chosen is their excellent thermal insulation. The low conductivity of the base material helps maintain indoor temperature and reduces energy bills. Noise insulation is another benefit when paired with double-glazed glass.
Aluminium windows, on the other hand, require thermal break technology to match the insulation capabilities of uPVC. With proper glazing and break systems, aluminium comes close to matching uPVC in energy efficiency.
4. Aesthetic Appeal and Design Flexibility
In terms of design, aluminium windows offer sleek, minimalistic frames and allow more glass visibility due to their high strength-to-weight ratio. They are available in multiple colors, textures, and metallic finishes that hold up well in salty environments.
uPVC windows tend to have thicker profiles to accommodate internal reinforcements. While modern designs have improved, most uPVC frames are still offered in basic colors like white or wood grain. Options for customisation are more limited in comparison.
5. Long-Term Maintenance Needs
Maintenance is a key factor when evaluating upvc windows for coastal projects. While they require minimal upkeep, over time they may lose color vibrancy or become brittle due to sun and salt exposure. Cleaning is simple, but replacement might be needed after 15–20 years.
Aluminium requires even less maintenance. Its finishes are durable, don’t peel or flake, and need occasional wiping with water to keep looking new. Lifespan typically exceeds 30 years.
6. Cost Evaluation for Coastal Projects
uPVC windows are cost-effective initially. For standard-sized openings in mid-rise homes, the upfront investment is lower than aluminium. However, hidden costs may appear in the form of earlier replacements or repairs in extreme environments.
Aluminium has a higher initial price point but offers longer life, reduced maintenance, and better design adaptability, especially for premium homes or high-rise buildings.
7. Environmental Impact and Recycling
Aluminium is 100% recyclable without quality loss. It can be reused multiple times, reducing carbon footprint. uPVC windows are recyclable as well, but the process is more complex and often limited by the additives used in the profile.
For environmentally conscious construction near ecologically sensitive coastal zones, aluminium may present a more sustainable option.