At Aluwdoors, sustainability is not an optional extra, but the norm. Our aluminium window frames are designed for a long service life, maximum insulation and minimal environmental impact. The choice of materials, production and logistics all play a key role in this. For Aluwdoors’s aluminium external window frames, we use high-quality profiles from Aliplast in Lokeren, Belgium. These profiles combine a sleek design with excellent insulation performance. That might seem obvious, but aluminium is actually a natural conductor of heat. The insulation therefore lies not only in the glass, but primarily in the clever construction of the profile itself.

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

Why insulated aluminium is a sustainable choice

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

Very long lifespan without loss of quality

Fully recyclable and endlessly reusable

Low-maintenance, no painting required

Strong material that allows for slim profiles and more daylight

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

Energy, comfort and insulation performance

The aluminium window frames are designed for high energy performance and optimal living comfort. Thanks to high insulation values, they ensure lower energy costs, less heat loss in the winter and less heating up in the summer, optionally in combination with solar control glass. This results in lower CO₂ emissions due to a reduced demand for heating and cooling, and makes the window frames suitable for nearly zero-energy (BEN) and low-energy homes. To achieve this, a thermal break is used between the inside and outside of the profile. This thermal break consists of a fibreglass-reinforced polyamide insulator that greatly reduces thermal conductivity. In addition, multi-chamber profiles, highly insulating strips and gaskets provide extra insulation and good airtightness. The systems are optimised for the application of HR++ and triple glazing.

In practice, this means a lower Uf-value for the profile, meaning less heat is lost via the aluminium, and a very low Uw-value for the complete window frame including glass. This ensures less cold downdraft and feeling of draught by the window, a higher level of 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 affiliated parties and is fully set up for the production of high-grade aluminium window frames. This guarantees consistent quality, certified processes and efficient batch production without unnecessary waste.

All aluminium profiles are extruded in Belgium by Aliplast, where the raw material is processed into durable, thermally broken profiles. These profiles are then processed into complete window frames in the Netherlands. By producing within the Netherlands and Belgium, transport distances are kept to a minimum and CO₂ emissions are reduced to a minimum. In this way, craftsmanship, economies of scale and high-quality engineering are combined with the lowest possible environmental impact.

Circularity and material use

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

Certifications and quality marks explained

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

Comparison: without and with thermal break

Characteristic	Without thermal break	With Aliplast thermal break
Heat loss	High	Low
Comfort	Cold spell possible	Comfortable and stable
Condensation	Greater chance	Greatly reduced
Energy consumption	Higher	Lager
Suitable for triple glazing	Limited	Yes