Abstract: A water and sound attenuating barrier for positioning between the interior surface of a vehicle door exterior panel and the door interior trim panel. The barrier is formed of a sheet of semi-rigid material having an inner face and an outer face. A thick layer of sound attenuating material is bonded to the sheet inner face and pressure sensitive adhesive is applied upon the sheet outer face. The sheet and trim panel are fastened together with the layer against the trim panel and with the adhesive bearing face exposed, to form a unitary module. To assemble the module with the door panel, the module exposed face is pressed against the door panel interior surface for securing the adhesive on the sheet outer face thereto. Mechanical fasteners removeably secure the sheet and the trim panel together and, also, secure the trim panel to the door panel during the assembly.