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A method of installing a roofing fastener including a screw and a stress plate into a multilayered roofing structure involves bonding the outer surface of the screw to the inner surface of the plate. Such a bond may be formed by spin welding as the screw is installed in the roofing structure. The fa

A method of installing a roofing fastener including a screw and a stress plate into a multilayered roofing structure involves bonding the outer surface of the screw to the inner surface of the plate. Such a bond may be formed by spin welding as the screw is installed in the roofing structure. The fastener is thereby installed and bonded in the same operation. A fastener assembly useful in the foregoing method includes a screw and plate having welding surfaces made of a thermoplastic resin.

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A method of installing a roofing structure on a roof, said method employing a roofing fastener including a plate and a screw having a threaded body and an enlarged diameter flanged head, said screw being received through a stepped hole in said plate, comprising: rotating said screw to effect engagem

A method of installing a roofing structure on a roof, said method employing a roofing fastener including a plate and a screw having a threaded body and an enlarged diameter flanged head, said screw being received through a stepped hole in said plate, comprising: rotating said screw to effect engagement with said roof so that said plate is tightened down against said roofing structure, and said threaded body passes through said roofing structure and engages said roof; by frictional interaction of said screw and plate during a final segment of said rotating step, spin-welding a surface of said screw with a surface of said plate to secure said screw and said plate against said roofing structure; and abruptly stopping rotation of said screw, whereupon said flanged head of said screw engages said step of said hole.