Galvanized Steel Standing Seam Roof. Galvanized steel (G:90 or Z275) standing seam roofing is hot-dipped steel that is coated in a zinc mixture. Galvanized steel roofing is durable and strong.

There is cheap, galvanized metal roofing used in other parts of the world, but that doesn’t hold a candle to the powder- or epoxy-coated steel roofing available today.