The use of a non-curved membrane is a delicate process requiring a control of the tolerances of installation in order to ensure good tensioning of the fabric. To enable the adjustment of the prestressing, the panels are fixed to the framework by means of a system of threaded rods. Sealing flaps then cover the panels and are inserted into an edge profile. On the roof, transparency was not an imperative. On the contrary, it was necessary to protect the spectators from the Nice sun, and that is why we used a PVC coated polyester fiber fabric, more opaque than ETFE. The fabric is placed on arches which give it a double curvature: high enough to ensure efficient operation of the membrane, without disturbing the overall reading of the shape of the roof.