Tray Roofing Weathertightness

The malleable nature of the metal used to manufacture tray roofing, the wide pan, and the vertical rib, give many options for achieving weathertightness. Generally, options that work with a trapezoidal profile will equally work for tray roofing but are most likely to be installed on secret grab fasteners rather than being riveted. The elimination of primary and secondary fasteners is another attribute abetting weathertightness, as are the tight laps and the water carrying capacity of the wide pan.

The wide pan of tray roofing makes it impractical to have longitudinal flashings cover two pans, and because of the vertical rib and fastening techniques, longitudinal flashings covering a single pan are acceptable.