Patent ID: 7021023

Claim:
A method of coupling together and simultaneously forming a continuous rigid waterproof joint between two adjoining channel-shaped panels, each panel formed of a central web having first and second side edges having respective upwardly projecting side walls, said joint extending along the entire length of said panels, wherein the first side wall of the first panel comprises a first vertical leg and a first base member connected to the upper end of said first vertical leg, said first base member having an outer edge located over said first side edge, a nail strip flange in the same plane as said central web and connected to the bottom of said first vertical leg, a second vertical leg being connected to a second base member, said second base member having an edge located under said first base member and a connection between the edges of said first and said second base members, and wherein one side wall of the second panel is comprised of a vertical leg with an upper, inverted U-shaped channel formed by a base member having an edge extending outwardly beyond said second side edge and a vertical lip, said method comprising the steps of: a) locating said first panel with said nail strip flange positioned in an orientation to overlay a roof supporting surface into which fasteners may be secured, b) driving fasteners through said nail strip flange into said roof supporting surface, c) placing the side wall of said second panel into engagement with said first side wall wherein said inverted U-shaped channel is situated over said first base member and the first and second vertical legs of said first side wall, and d) placing pressure-applying means against said side walls and effecting a seaming deformation thereof whereby said lip is deformed to a position lying directly beneath said first base member on said first vertical leg.