초록 ▼

An improved method of attaching a roofing membrane to an underlayment and an improved roofing construction made by the improved method. A screw and a composite roofing washer are used to attach the membrane to the underlayment. The composite roofing washer is an interlocked assemblage of a metal roo

An improved method of attaching a roofing membrane to an underlayment and an improved roofing construction made by the improved method. A screw and a composite roofing washer are used to attach the membrane to the underlayment. The composite roofing washer is an interlocked assemblage of a metal roofing washer and a thermoplastic insert. After the screw has been driven, the thermoplastic insert is heated so as to cause some of the material of the thermoplastic insert to flow over the head of the screw, thereby to heat-seal the screw to the thermoplastic insert. The thermoplastic insert may be so heated when the roofing membrane is welded to another like membrane at an overlapped seam.

대표청구항 ▼

A method of attaching a sheet of roofing material, such as a roofing membrane, to an underlayment, such as a metal or wooden deck, possibly with one or more layers of roofing material, such as a blanket of roofing insulation, between the sheet of roofing material and the underlayment, the method com

A method of attaching a sheet of roofing material, such as a roofing membrane, to an underlayment, such as a metal or wooden deck, possibly with one or more layers of roofing material, such as a blanket of roofing insulation, between the sheet of roofing material and the underlayment, the method comprising: (a) providing a screw having a head and having a threaded shank, (b) providing a composite roofing washer being an assemblage of (1) a metal roofing washer having a central aperture and having a countersunk cavity, which includes the central aperture, (2) a thermoplastic insert, which is made of a material that flows when heated sufficiently and that resolidifies when cooled to ambient temperatures prevailing where the method is practiced, the thermoplastic insert being inserted into the countersunk cavity of the metal roofing washer and having a central hub, the central hub extending through the central aperture of the metal roofing washer and being shaped so as to interlock the thermoplastic insert and the metal roofing washer, the thermoplastic insert having a central aperture and having a central socket, the central socket being adapted to receive the head of the screw, (c) driving the screw so as to drive the threaded shank of the screw through the central aperture of the thermoplastic insert, through the sheet of roofing material and any layer or layers of roofing material between the sheet of roofing material and the underlayment, and into the underlayment until the head of the screw is received by the central socket and bears against the thermoplastic insert, (d) heating the thermoplastic insert so as to cause some of the material of the thermoplastic insert to flow into the central socket and over at least part of the head of the screw, while the thermoplastic insert and the metal roofing washer remain interlocked at the central hub, thereby to heat-seal the screw to the thermoplastic insert when the material caused to flow resolidifies, and (e) terminating step (d) so that the thermoplastic insert can cool and pressing on the thermoplastic insert after the thermoplastic insert has been heated but before the material caused to flow has resolidified.