While some homeowners prefer this natural patina, you can apply a clear coat of sealant to slow the aging process. Sealing a copper roof costs about $3 per square foot or between $450 and $2,100 ...

Patina is part of why copper is such a durable and long-lasting metal, often used for roofs and railings. Patina won't flake away like rust, though it can be removed with certain products.

Metal roofing comes in steel, aluminum, copper, and alloy strips, and in various shapes and textures. Copper is especially expensive. Over time, copper acquires a greenish patina that some people ...

is destined to end in a soft-green patina. Workers have installed the solid copper roof on three of the terminal’s four distinctive domes that were designed by Minoru Yamasaki and completed in 1956.

With winter fast approaching, it looks like the roof will be left to develop the brown patina on its own. But don’t hold your breath for the green color so often associated with aged copper.

The new roof is composed of Armor Tile stone-coated metal panels manufactured to match the patina and character of the original stone tile. Armor Tile is lighter than terra cotta (just 1.32 pounds per ...