Aluminum Flashing Tape
Tape for permanent roof repair
A gutter repair and a windy storm exposed a leak problem between an aluminum patio roof and the house’s facia board. There was a quarter-inch gap between the two. Even the best caulking isn’t going to reliably fill that as the metal roof expands and contracts with weather. Enter aluminum flashing tape, which features an outside layer of aluminum/polymer that’s ready for weather, and an inside layer of rubberized asphalt adhesive. It can be molded to adhere to the corrugations of a patio roof, or whatever (mobile homes and automobiles are mentioned in comments on the products).
Application tip: if you want to adhere to an uneven surface, start at one end, work the tape into the grooves, and unroll as you go.