Corten Steel Panel is a durable, weathering steel that starts out a typical steely grey color and develops a warm, rust-colored patina over time. Unlike rust, however, this patina is non-corrosive and doesn't affect the steel's integrity. You can let the steel weather naturally, or speed it along with a simple solution of vinegar, salt, and hydrogen peroxide — ingredients you most likely already have at home.
Corten Steel must be cleaned out regularly, especially if you have trees that hang above your roof. Pooling areas from dirt piles or rotted debris eat through the metal over time and can ruin your roof. If you have Corten Steel Panels siding, do not allow the soil to come into contact with your siding.