A structural and thermal assessment of the façades was carried out with the objective of initiating a renovation program. The defects affecting these façades were identified, and several renovation scenarios were developed. A pilot dismantling operation involving the removal of a façade frame was performed to assess the condition of the load-bearing structure.

It was decided to retain the existing primary mullions, offering several significant advantages: their conservation allowed the façade replacement to be completed within a two-month construction period during the summer break, since the existing structural grid was already in place. This approach also resulted in substantial cost savings compared with a full replacement and contributed to a reduced carbon footprint. The replacement of the transoms was necessary due to the observed defects, and a new mullion-to-transom connection system was designed. A mock-up on site was carried out to validate the proposed solution.

The old glazing was recovered on site by Saint Gobain for their recycling process