A standing seam roof formed in solid copper rather than coated steel or aluminum. It runs roughly 25 to 45 dollars per square foot installed, several times the cost of steel, and it is chosen as a long term architectural decision rather than on value arithmetic.
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The metal itself, principally. Copper is a commodity and its price moves, which is why quotes can carry a shorter validity window than usual.
Beyond material, seams and details on copper are often soldered rather than only mechanically closed, which is skilled work and slower. Fewer crews do it well. how metal roofing is priced sets out where the rest of a roofing quote goes.
New copper is bright, dulls to a russet brown over the first year or two, and moves toward the familiar green verdigris over decades. Coastal and industrial air speeds it up; sheltered and dry conditions slow it down.
The change is uneven while it happens. If you want a uniform finish from the start, pre-patinated sheet exists and costs more again. how the work is sequenced covers the wider system.
Longer than any other common residential roofing material, commonly quoted in excess of a century when detailed and installed properly.
Runoff from new copper can stain masonry and stonework beneath it. It is a detail worth raising before installation rather than after.
Carefully. Copper in contact with galvanized steel or aluminum can drive galvanic corrosion, so flashing, fasteners and gutters need to be compatible.
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