Metal roofing on a coastal New Jersey home starts at the deck, not the panels. We tear off old asphalt shingle down to the sheathing, replace plywood or OSB that has gone soft, and check the truss and rafter line before anything closes up.
Next comes synthetic underlayment and ice-and-water shield along the eave and the valley, because those are the spots water reaches first. Then panels go down: a standing-seam panel with concealed fasteners, or an exposed-fastener corrugated panel when the budget is tighter.
Standing-seam steel, stone-coated steel, and aluminum all hold up to salt air, and we regularly install profiles from McElroy Metal, ATAS, and Decra. A 24- or 26-gauge panel with a PVDF or SMP finish should run 40 to 50 years on this coastline.
