Abstract: The invention concerns a sealing extruded section designed to be mounted on a projecting part. Said extruded section comprises: two elastomer or plastomer shells (1, 2), including each a wing (1a, 2a) and an adjacent part (1b, 2b) forming a portion of the section base, said two shells being separated from each other by an opening (3) arranged through the section base and extending longitudinally along the median part thereof; a flexible material layer (7) inextensible or hardly extensible, applied inside the two shells (1, 2) so as to secure the two wings (1a, 2a) and the adjacent parts (1b, 2b) to the section base; a wedging shim (4) with cross-section substantially identical to that of the opening (3) separating the shells (1, 2), wherein it is forced in engagement, the cross-section of the opening (3) being such that, when the wedge (4) is fixed, it brings about a tilting movement of said shells relative to each other, thereby bringing closer together the free ends of the two wings of the section.