When selecting building materials, durability is a critical consideration. Decades of exposure to weather, moisture, pollution, sunlight, and daily wear can compromise a building component’s functionality and appearance. However, aluminium performs well under many of these conditions, thanks to its inherent corrosion resistance, moisture tolerance, and strong mechanical properties.

One of aluminium’s defining characteristics is its ability to protect itself. Even untreated, aluminium naturally forms a thin oxide layer when exposed to air. This oxide layer acts as a barrier against atmospheric corrosion and provides protection without requiring additional surface treatment. Even if the surface is scratched or damaged, this oxide layer naturally reforms. In building applications requiring additional protection or specific aesthetic finishes (e.g. in ventilated façade systems or joinery solutions), aluminium can also be anodised or coated. These surface treatments provide additional protection against corrosion while offering a wide range of colours and finishes. The colour can also be maintained for a long period. This, combined with the corrosion protection, can extend the service life of aluminium components. In turn, this can help extend the service life of building components.

The natural corrosion resistance of the material, added to the quality of surface finishes, allow aluminium building elements to perform well in a range of environments. In many urban atmospheres, aluminium has demonstrated good resistance to atmospheric corrosion and the main pollutants have little effect on the material. Aluminium can also provide good corrosion resistance in many coastal applications. Additionally, in many outdoor applications, rainwater can naturally wash exposed aluminium surfaces, diluting pollutants resting on the surface, washing them away and helping preserve durability.

Another important characteristic for outdoor applications is aluminium’s stability under prolonged exposure to sunlight. Aluminium is stable at the temperatures typically encountered and does not degrade when exposed to UV. As a result, aluminium can retain its appearance and mechanical properties over long periods of exposure when appropriately maintained. Additionally, unlike some materials, aluminium does not rot when exposed to moisture, further contributing to its durability.

But aluminium’s durability is not only a result of its resistance to environmental conditions. Aluminium also combines high mechanical strength with ductility, allowing products to withstand wear and the required loads without significant deformation. This combination of properties can support long service lives in many building applications. Aluminium retains its strength, stability and mechanical performance. As a result, many aluminium construction products may require relatively low maintenance over their service life, depending on design, application and environmental conditions.

The combination of corrosion resistance, environmental stability and mechanical performance makes aluminium a very versatile material, one that can provide a long service life. Its durability and design flexibility make it suitable for a wide range of architectural applications. These inherent properties contribute to the reliable performance of aluminium building products throughout their service life.