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Why metal works in Summerville.
Lowcountry weather is exactly the kind of weather that wears out an asphalt roof and shrugs off a metal one. Heat, humidity, and salt-tinged air slowly cook shingles — granule loss accelerates, sealant strips weaken, and the system simply doesn't hit its rated lifespan. A properly-installed standing-seam metal roof on a Summerville home routinely makes 40 to 60 years with minimal intervention.
That said, metal is a long-term decision. The math works if you're staying in the home long enough or selling to a buyer who values the roof.