Patent ID: 7867562

Claim:
A method of controlling coating edge thickness in a roofing substrate comprising: (a) conveying a web of roofing substrate along a longitudinal path in a generally horizontal direction; (b) applying an adhesive coating to the web of roofing substrate as it moves along its path; (c) applying surfacing agents in the form of granules to a first surface of the adhesive coated web as the web moves along its path in a generally horizontal direction; (d) applying a coating to the surfacing agents, thereby forming a film having a cross-machine direction and a longitudinal-machine direction and having one or more uncoated selvage edges; (e) modifying a thickness of a first portion of the film along one of the edges of the film, thereby forming a film having a substantially predetermined profile in the cross-machine direction; wherein the substantially predetermined profile comprises a substantially uniform thickness.