At Aluwdoors, sustainability is not an optional extra, but the standard. Our aluminium window frames are designed for a long service life, maximum insulation and minimum impact on the environment. Material choice, production and logistics all play an important role in this. For Aluwdoors's aluminium exterior windows, we work with high-quality profiles made by Aliplast of Lokeren, Belgium. These profiles combine slim design with excellent insulation performance. This may seem obvious, but aluminium actually conducts heat by nature. The insulation is therefore not only in the glass, but mainly in the clever construction of the profile itself.

Modern steel sliding doors with large glass panes for a sleek look and maximum light.

Why insulated aluminium is a sustainable choice

Aluminium is strong, durable and low-maintenance, but without additional technology, heat would easily dissipate from inside to outside. Modern aluminium window frames therefore use thermal breaks and multi-chamber profiles to stop this heat conduction.
In addition, it has/is:

Very long service life without loss of quality

Fully recyclable and endlessly reusable

Low-maintenance, no painting required

Strong material allowing slim profiles and more daylight

Suitable for HR++ and triple glazing for maximum energy savings

Energy, comfort and insulation performance

Aluminium window frames are designed for high energy performance and optimum living comfort. With high insulation values, they ensure lower energy costs, less heat loss in winter and less heating in summer, possibly combined with solar control glass. This results in lower CO₂ emissions due to reduced heating and cooling demand and makes the window frames suitable for BEN and low-energy houses. To achieve this, a thermal break between the inside and outside of the profile is used. This thermal break consists of a glass-fibre-reinforced polyamide insulator that greatly reduces thermal conduction. In addition, multi-chamber profiles, high-insulating strips and seals provide additional insulation and good airtightness. The systems are optimised for application of HR++ and triple glazing.

In practice, this means a lower Uf value of the profile, so less heat is lost through the aluminium, and a very low Uw value of the complete window frame including glass. This ensures less cold fall and draught at the window, higher living comfort in both winter and summer and permanently lower energy costs. The combination of profile and glass ultimately determines the total energy performance of the window frame.

Production, origin and quality

The exterior window frames are produced through a specialised Dutch manufacturing partner. This manufacturer works exclusively for affiliates and is fully equipped to produce high-quality aluminium window frames. This guarantees consistent quality, certified processes and efficient series production without unnecessary waste.

All aluminium profiles are extruded in Belgium at Aliplast, where the raw material is processed into durable, thermally broken profiles. These profiles are then processed into complete window frames in the Netherlands. Production within the Netherlands and Belgium limits transport distances and minimises CO₂ emissions. In this way, craftsmanship, economies of scale and high-quality technology are combined with the lowest possible environmental impact.

Circularity and use of materials

Aluminium is ideally suited for circular construction. The material can be infinitely reused without loss of quality. Old frames are melted down into new profiles, preserving raw materials and preventing waste. Combined with the long service life of aluminium window frames, this contributes to a sustainable and future-proof building solution.

Certifications and labels explained

Certificate	What does this mean?
ATG	Belgian quality label confirming performance and reliability of construction products
KOMO	Independently verified quality declaration for products and assembly processes
Cradle to Cradle	Product is circular, safe for humans and the environment and fully reusable
Environmental Product Declaration (EPD)	Transparent insight into environmental impact over the entire life cycle
BREEAM-compliant	Supports sustainable building certification of entire buildings

Comparison: without and with thermal break

Feature	Without thermal break	With Aliplast thermal break
Heat loss	High	Low
Comfort	Cold trap possible	Pleasant and stable
Condensation	Greater chance	Strongly reduced
Energy consumption	Higher	Bearing
Suitable for triple glazing	Restricted	Yes