Patent ID: 9356174
Filing Date: 2016-05-31
CPC Classification: E04D,H02S,Y02B,Y02E

Claim Text:
1. A roofing system comprising an underlying flashing element having a cross-sectional shape comprising a laterally-extending flange, the flange having an edge, a first end and a second end, the underlying flashing element comprising a return hem disposed at the edge and comprising a folded-over strip of material disposed over the top surface of the flange at the edge, the return hem having a first end disposed toward the first end of the edge, and a second end disposed toward the second end of the edge, wherein the total thickness of the return hem at its second end is no greater than the interior thickness of the return hem at its first end; and an overlying flashing element having a cross-sectional shape comprising a laterally-extending flange, the flange having an edge, a first end and a second end, the overlying flashing element comprising a return hem disposed at the edge and comprising a folded-over strip of material disposed over the top surface of the flange at the edge, the return hem having a first end disposed toward the first end of the edge, and a second end disposed toward the second end of the edge, wherein the total thickness of the return hem at its second end is no greater than the interior thickness of the return hem at its first end; wherein the second end of the flange of the overlying flashing element overlaps the first end of the flange of the underlying flashing element, the second end of the return hem of the overlying flashing element nests under the folded-over strip of material of the return hem of the underlying flashing element at the first end thereof, and the return hem of the underlying flashing element includes a discontinuity, at which the inside thickness of the return hem transitions, in a direction going from the first end of the return hem, from substantially greater than the total thickness of the return hem at its second end to substantially less than the total thickness of the return hem at its second end.