Abstract: A sheet metal cladding panel for covering roofs and walls of buildings. An elongated sheet metal member forms a web of the panel. The sheet metal member has upwardly folded flanges along two elongated edges of the web of the panel. A first of the upwardly folded flanges is folded outwards and downwards along an upper edge to form a first lap. A second of the upwardly folded flanges is folded inwards and downwards along its upper edge to form a half lap. Also a system and a method for cladding roofs and walls with at least two panels. The panels include pre-cuts at a double-layered first flange.