The renovation of the Grande Nef de l’Île-des-Vannes focused on restoring and reinforcing its structural integrity while adapting it for modern use. Originally designed in 1971, the venue suffered from severe deterioration, requiring extensive structural repairs to ensure safety, durability, and compliance with contemporary building standards. Chatillon Architectes led the refurbishment, implementing advanced engineering solutions to strengthen the existing framework while preserving the distinctive architectural features.
The original structure consists of two massive inclined concrete arches spanning 25 metres, braced by facade posts and interconnected by a network of tie rods that support the roof. The renovation included the repair and reinforcement of these key load-bearing elements to restore their original strength. Concrete deterioration was addressed through structural rehabilitation techniques, ensuring the stability of the venue for long-term use. Additionally, the building’s foundation was examined and upgraded where necessary to prevent future settlement issues.
A significant challenge was improving the building’s thermal and acoustic performance without compromising its design. The translucent polycarbonate facade, a defining feature of the 1970s construction, was replaced with a double-skin insulated cladding system. This upgrade not only improved energy efficiency but also maintained the venue’s unique natural light qualities. The roof was fitted with a synthetic membrane to enhance insulation and weather resistance while preserving its curved form, inspired by maritime structures.
To meet modern safety and accessibility standards, the renovation incorporated new structural elements, including reinforced flooring systems designed to support high-impact sports activities. Acoustic wood panelling was added to improve sound control, and original lighting fixtures were replaced with LED systems integrated into the existing framework. HVAC ducts were suspended beneath the arches to enhance indoor climate control without altering the architectural composition.
The project successfully balanced structural reinforcement with architectural preservation. By upgrading the venue’s core structural components, improving its energy efficiency, and ensuring universal accessibility, the renovation has secured the future of the Grande Nef. Initially serving as a training facility for the 2024 Olympics, the building will later return to the municipality of Saint-Ouen-sur-Seine, continuing its role as a key cultural and athletic landmark.
