The assessed kits for external wall claddings mechanically fixed, named “Alucoil^® Riveted Boards” (family A) and “Alucoil^® Suspended Cassettes” (family G), are based on riveted boards and suspended cassettes made of thin metallic composite panels (TCMP) “larson^® A2”, “larson^® FR” and “larson^® FR Metals Inox”, which are manufactured by the ETA-holder. These claddings are mechanically fastened to a subframe, fixed to the external walls of new or existing buildings (retrofit). An insulation layer can be fixed on the external wall.