Metal corrodes first
Fasteners, flashing, vents, and drip edge degrade well before the covering does. A coastal roof frequently needs metal components replaced on an otherwise serviceable assembly — a much smaller job than a replacement.
Specify the metal
Which metal is being installed matters far more here than inland. A contractor who cannot name it on the estimate has not accounted for your location.
Wind exposure at the edges
Onshore wind works at rakes, eaves, and ridges continuously, not just during storms. Edge detailing and fastening patterns deserve explicit mention in a coastal scope.
Deck and parapet details on modern coastal homes
Roof decks, parapets, and low-slope sections are common along the coast, and they concentrate leaks at terminations and drains. Ask where the documented failures are before accepting a whole-roof scope.
Frankly