Hemp block retrofit transforming former factory into cultural venue

The Atoma Art Center renovation converts a former industrial factory in Brussels into a contemporary cultural and exhibition space while retaining the existing structural fabric. Designed by Urban Nation Architects and completed in 2024, the project transforms approximately 3,600 m² of industrial building area including the 1,000 m² Constantin Chariot Space. The retrofit strategy focuses on improving internal environmental conditions while respecting the constraints of the existing structure. Approximately 800 m² of hemp-lime blocks manufactured by IsoHemp were installed as internal insulation. These blocks combine hemp fibres and lime to form a lightweight bio-based masonry unit that provides thermal insulation, acoustic attenuation and vapour permeability. The material enables the historic building envelope to remain breathable while improving energy efficiency and interior comfort. Hemp blocks also contribute acoustic absorption, which is particularly relevant for a cultural venue hosting exhibitions and events. By inserting a natural insulating layer within the existing fabric rather than replacing the structure, the project demonstrates how bio-based materials can support energy upgrades in adaptive reuse projects while maintaining the architectural character of industrial heritage buildings.