Galvanic corrosion is a metal roofing problem that occurs whenever two different types of metal come into contact with one another in the presence of electrolytes. This is also a problem that every homeowner will want to avoid as it won’t just shorten your metal roof’s lifespan, but it also causes a stain on your roof that can greatly impact your curb appeal. However, most homeowners are unaware as to what causes galvanic corrosion.
Copper shouldn’t be used for roofing. In fact, even a trace amount of copper can trigger galvanic corrosion in a metal roofing system. It’s somtimes used in AC units and lighting system cables. To prevent the damage that copper can cause a metal roof, use a cable that has aluminum instead and install PVC piping on your AC units to prevent water mixed with copper from dripping onto your metal roof.
During the installation process, your professional roofing contractor may have to write something on the metal roof using a pencil. This should be avoided at all costs as the graphite in pencils can be extremely corrosive to aluminum and aluminum alloys. Instead, tell them to use a sharpie or a grease pencil to prevent any type of damage to the roofing system.
On the other hand, if you have pipe penetrations installed on your metal roof, make sure to choose pipes that are not made of lead. Otherwise, galvanic corrosion can eventually trigger and shorten your roof’s lifespan. Alternatively, you can also have the steel panels coated with a zinc or aluminum coating known as Galvalume® to protect the steel from corrosion.
Turn to Hill Roofing Corporation for all your roofing needs. We are your number one provider of residential and commercial roofing services. Give us a call at (703) 291-0311, or fill out our contact form to get a free quote. We serve homeowners in Arlington, Manassas and other nearby areas.