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Galvanic Corrosion On Metal Roofs: The Usual Suspects

Nowadays, metal roofs are one of the most popular residential roofing materials. This is all thanks to their affordability, durability and energy efficiency capabilities. Unfortunately, like every roofing material, they do come with their own downsides and the problem of metal roofs just happens to be galvanic corrosion.

In this post, All American Roofing discusses the common causes of galvanic corrosion on metal roofs and what you can do to prevent it.

Galvanic Corrosion: What Is It and What Causes It?

For the uninitiated, galvanic corrosion is an electrochemical process where one kind of metal corrodes when it’s put in direct contact with another kind of metal in the presence of electrolytes, like water. According to roofing experts, there are three kinds of metals that can kick start galvanic corrosion. The first is copper. Copper is a metal that doesn’t react well with galvanized metal panels, it’s important that you keep the contact between them to a minimum. Avoid using treated lumber or cables that have copper wiring instead of aluminum.

Apart from copper, lead is another common cause of galvanic corrosion, so if you have plans of installing pipe penetrations, avoid using lead roof jacks. Graphite in the common pencil is the third possible cause of galvanic corrosion and often occurs when a roofer uses a graphite pencil to write on the metal panel of the roof. As much as possible, tell your roofer to avoid doing this and ask them to use a sharpie or grease pencil instead.How To Prevent Galvanic Corrosion

Thankfully enough, it is possible to prevent galvanic corrosion and this can be accomplished through the application of galvalume coating. Galvalume can effectively protect the steel of your metal roof from corroding and allows you to keep your roofing system in top form for years to come.

Turn to All American Roofing for your home improvement needs. We are your number one provider of residential and commercial roofing services. Give us a call at (405) 787-0400 or fill out our contact form to request a free consultation. We serve homeowners in Oklahoma City, OKC and other nearby areas.