A wall comprising two generally parallel wallboards (1), which form a part of the surface of the wall on each side, together with a post (4) of sheet metal, preferably of galvanized sheetiron, with a flange (5) on each end of the section of the post, where each flange lies in a respective kerf (7) in the edge of a wallboard, wherein each wallboard has a groove (3) in the one edge and a respective tongue (2) at the opposite edge, in addition to the kerf for the flange of the sheet metal post in one or the other edge.