Abstract: The present invention is a roofing fastener assembly. The assembly includes a fastener, a barbed washer, and a screw. The screw projects through the fastener and exits the free end of the fastener. Upon installation of the screw and fastener, the barbs of the washer penetrate into the roof membrane and insulation layer. An extending rim on the washer receives the head of the fastener to resist the relative lateral movement of the washer and fastener. Stabilizing fingers project from a free end of the fastener and hold the screw in place during assembly.

Abstract: A rotatably drivable roofing fastener of the invention of a synthetic-resinous-polymeric material, such as of an injection molded cut-glass-fiber filled nylon composition, includes means adapted for drillably cutting into insulation material during fastener installation and also means adapted to matingly engae a special tool providing rotatable driving while the tool also concurrently rotatably drives and matingly engages the head of a metal screw, which is located within an upper region of an aperture running lengthwise through the fastener's head and downwardly extending shank, so that the metal screw's threaded shank and tip extending from the aperature at the bottom of the fastener penetrates roof deck or existing roof structure upon rotatable driving so as to secure insulation material to roof deck or existing roof surface.