Abstract: The invention relates to a covering device comprising: at least one metal sheet, especially a metal sheet used for cladding, suitable for covering at least one section of a surface of a building structure, fastenings for definitively attaching the metal sheet to the structure, at least one accessory suitable for applying to a receiving area on the metal sheet, and means for removably attaching the accessory to the receiving area, that are suitable for attaching the accessory once the metal sheet is already attached to the structure by means of the fastenings, maintaining the structural integrity of the metal sheet, and also the integrity, especially in terms of tightness, of the attachment of the metal sheet to the structure by means of the fastenings, said attaching means including a head of the fastenings, that can enable the assembly, and if need be, the disassembly, of the accessory, without affecting the attachment of the metal sheet to the structure by means of the fastenings.