The construction industry is moving beyond simple recycling by increasingly focusing on “circularity”. Aluminium stands out as a key material in this shift, particularly in the production of high-performance doors, windows, and curtain walling.

The journey of an aluminium construction product such as a window or curtain wall is not a linear path from “cradle to grave” but an infinite loop “from cradle to cradle”. The process begins with metal sourcing, where today, more than half of the aluminium produced in the European Union originates from recycled materials.

Aluminium’s durability means that building products can have a “use phase” that lasts decades, providing low-maintenance performance and superior technical performance (e.g. air permeability, watertightness, resistance to wind load, thermal transmittance) that enhances a building’s overall energy efficiency.

Circularity is only possible if the material is actually recovered. Research has shown that aluminium collection rates in the European building sector exceed 92%, with averages reaching as high as 96%. The high intrinsic value of aluminium provides a continuous economic incentive for deconstruction and collection rather than disposal.

Building systems like aluminium windows, doors, and curtain walling are engineered with thermal breaks to ensure excellent energy performance throughout their long service life. The products’ ease of disassembly ensures that components can be recovered systematically, facilitating the transition to the next phase of the material’s life since, after dismantling.

Modern recycling technologies allow processing complex construction products and return them to the production cycle as high-grade materials These products undergo a complex separation process to isolate the aluminium from other components. Mechanical separation, using technologies such as shredding and eddy currents, removes materials like plastics and thermal breaks. Finishes, such as powder coatings, are then thermally removed before remelting.

The resulting aluminium is cast into new extrusion billets, which retain the same properties as primary aluminium and can be used to manufacture new building profiles.

Whether it is a minimal window frame maximising natural light or a complex robust curtain wall system, aluminium construction products represent a realised circular economy. By choosing these systems, architects and investors aren’t just selecting building material; they are securing a resource that will be used, recovered, and reborn for generations to come, proving it is an exceptional example of low-carbon footprint material.