Abstract: The invention relates to profiled elements (P) for the interior and exterior mounting, each element comprising at its lateral edges connection portions (10, 20) for establishing tongue and groove connections, and the connection portions (10, 20) comprising co-ordinated bulges (14, 24, 25) and recesses (12, 13, 22, 23) to provide a multi-level engaging of the tongue (10) into the groove (20). At least the groove (20) is comprising at each of its bottom and top sides (U, O) two bulges (24, 25) and/or recesses. The bulges (14, 24, 25) and recesses (12, 13, 22, 23) are symmetrically formed towards the transverse axis of the profiled element. The tongue (20) comprises a notch, in particular a V-shaped groove (27), which takes up the bolt head of a mounting screw (M). Thus the elements can be assembled and installed more easily and fast. Laminates or composites made of that elements are very flexible to compensate material-conditioned dimension changes caused by varying temperature and dampness.