FLOW is a new office building located in Leudelange, Luxembourg. Developed by Paulux Invest and designed by ARCHi2000 & Associés, it comprises approximately 10,700 m² of gross floor area spread over four above-ground levels and three basement levels, organised around a central landscaped patio. The project carries a strong environmental ambition, targeting BREEAM Excellent, WELL Gold and Nearly Zero Energy Building certifications, in line with the European taxonomy. Its structure is based on a low-carbon hybrid timber-steel system, fully modelled in BIM (Revit).
The superstructure uses a hybrid column-and-beam system that puts the right material in the right place. Continuous steel beams provide large spans and bear on glued-laminated timber columns arranged on a regular 8.10 × 5.40 m grid; the cross-laminated timber (CLT) floors span 5.40 m, with their soffit left exposed, as are the columns. Stability is provided by two continuous reinforced-concrete cores, complemented by cross-bracing in glued-laminated timber placed on the gable ends. Reinforced concrete is otherwise limited to the three basement levels, built as flat slabs with a perimeter retaining wall. With nearly 1,200 m³ of structural timber, the project achieves a reduction in carbon footprint of around 30% compared with an all-concrete solution (Énergie et Environnement study). The structure is designed for 90 minutes fire resistance, and WOW Engineering provides the complete stability engineering mission.
3, rue Léon Laval – Leudelange
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