System for attaching a panel to a girder, and supporting structure including the system

An attachment system for attaching at least one panel to a supporting structure that includes at least one longitudinal member extending in a first direction, the longitudinal member including a folded edge and a bearing surface of the panel, the system comprising:

• a flange;
• a retaining plate;
• and
• an attachment assembly attaching the flange to the retaining plate arranged in such a way that on assembly the folded edge of the longitudinal member and the panel bearing against the bearing surface of the longitudinal member are sandwiched together,
• wherein the retaining plate has a first set of teeth projecting substantially parallel to one axis of the attachment assembly in the direction of the flange, the teeth being configured to engage within the folded edge of the longitudinal member by clamping onto it during assembly.