That's what makes it so beautiful! Plus, after installing and exposure, the pre-patina application will continue to change and develop over time. There is no way to achieve a consistent, even shade of one type of patina green. It's important to understand that accelerating the patina isn't like adding a coat of paint. If any of these conditions change from one application to the next, the final result will be noticeably different. Even with the same chemical, the result will be affected by variations in: It's the application itself that has the biggest impact on the finished roof. When we're asked here at Metal Roof Network to provide pre-aged copper finishes on our copper roofing, we use proven formulas that we know to be predictable and safe. Most methods involve some kind of acid with chemical additives to accentuate the green, blue, gray or black patina of copper. Fortunately, today's methods are more effective (and less disgusting). There are old records of horse urine being poured on new copper roofs in an attempt to make them appear old and green. For copper roof owners in dry, cold, or desert climates, exposed copper can take generations to oxidize to a visibly green patina.Įxplaining the patina process is one thing - accelerating it is another. When the environment is warmer and more humid, these colors are reached more quickly. The patina develops through stages of color, and the greens and blues are reached after many years of exposure. The patina actually protects the metal from corrosion, in addition to being aesthetically striking. Unlike the oxidation that occurs to steel and iron, however, the patina that forms on copper provides a not insignificant amount of protection to the base metal. Similar to rusting steel, the patina process begins immediately, and will continue indefinitely. This process happens to every natural copper roof that’s exposed to the weather. Copper reacts to rain and moisture in the air, turning the bright, shiny metal into a darker gray/brown and, eventually, to some shade of green. The copper patina that accumulates on copper roofing is a natural process resulting over time with exposure to the atmosphere. These samples were freshly treated and will darken quite a bit with exposure, but the color will remain mostly consistent for some time. This is an example of three different samples of patina applications on one of our copper shingle product.
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