Copper is a common material used in roofing and electrical systems, but when it comes to rooftop solar racking, compatibility mainly depends on the metals used in the racking system. Copper itself isn’t typically part of the solar racking, but copper roofing or copper flashing can come into contact with aluminum or steel rack components. This is important because copper and aluminum or steel can create a galvanic reaction when they’re directly connected, especially in wet or humid environments. This reaction causes corrosion, which could degrade the roof material or the racking hardware over time. To see if you have a copper element on your roof, look for the reddish-brown metal sections or flashing. A safe DIY check is to inspect the areas where the racks connect to the roof for any signs of greenish or white powdery corrosion, which is often a sign of galvanic issues.
If you’re considering solar panels for a copper roof or have existing copper parts near where you want to install racks, it’s wise to bring in a professional roofer or solar installer experienced in metal roofing systems. They can help ensure the mounts are isolated properly to prevent galvanic corrosion, often by using non-metallic barriers or compatible materials. When talking to a contractor, you might ask, "How do you prevent corrosion between the copper roof and the aluminum or steel mounts?" and "Do you offer warranty protections specifically addressing metal-to-metal corrosion risks?" Understanding these points can help protect your roof’s longevity and maintain your solar system’s performance.