Denmark's tallest wooden building, the Træ office building, stands at 78 metres over 20 floors and incorporates innovative steps to reduce its climate footprint. Developed by PFA Ejendomme, the building's CO2 savings are reported to be up to 75% compared to traditional concrete and steel construction.
Photo: Artelia Group.
A standout feature of the building is its ground-floor façade, which uses mosaic-like window sections made from discarded double-glazed windows. This window system, called "Viddø," was developed by A:gain in collaboration with Krone Vinduer. These upcycled windows, which were previously discarded due to minor defects, are digitally assembled using an AI-driven design tool. This allows the windows to be arranged like a puzzle, maximising the use of available materials.
In the Træ project, approximately 110 square metres of the façade are made from these upcycled Viddø elements, with around 60% of the windows being sourced from discarded glass. The Viddø system has been shown to save 22.03 kg of waste and 22.4 kg of CO2 per square metre compared to windows made from virgin materials.
As the project has gained significant attention in the construction industry, A:gain and Krone Vinduer are now preparing for increased demand, with several large projects planned for 2026 and 2027. The system's growing popularity has led the companies to scale their operations, including automating logistics and inventory management.
Source: www.wood-supply.dk