A vent, duct, or other unit with an integral flange features a primed base flange set into roof cement over installed ply sheets and stagger-nailed at four inches on center, noting that lead flashings do not require fastening. Two stripping plies are set in asphalt extending outward with staggered laps over the nail zone. The assembly rests on membrane per specifications complying with FM 90 over the typical roof section.
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