Abstract: Retaining rail (1) for holding down roofing membranes of flat roofs comprises a web (13) and lateral edge folds (14,14?). The web (13) is provided with openings (11) for attaching fastening means (10). Each of the lateral edge folds (14,14?) forms bearing-side shoulders (21,21?). The web (13) lies above the bearing plane (26) defined by the bearing-side shoulders (21,21?).

Abstract: A method of manufacturing an elongated rail (12) with a C-shaped cross-section transversely of its elongated direction from a sheet metal strip (1) by bending marginal sections along each elongated side edge (2) of the strip at 90.degree. with respect to the surface of the strip. Effecting the bending action by discs (5, 6, 7). Next using a profiling disc (8) rolling a profiled surface into each of the side edges (2) and then after returning the marginal edges to their original thickness, bending the strip into a C-shaped cross section extending transversely of its elongated direction.