Metal roofing is becoming more popular because it is beautiful, versatile, durable, and lasts a long time. Like any other material, it needs to be put in the right way to avoid expensive problems. Galvanic corrosion is one of the most common things that can go wrong with a metal roof.

What does galvanic corrosion mean?

Galvanic corrosion is an electrochemical process that happens when one metal touches another metal through an electrolyte. Water is a weak electrolyte, so it would be water that would speed up the process of putting on a metal roof. It can happen any time two different kinds of metal touch each other.

Why and how to stop it

Corrosion in metal roofing systems is often caused by lead and copper. Lead roofing materials, like lead roof jacks, should not be used for pipe penetrations because they are likely to rust. Also, graphite eats away at aluminum and aluminum alloys very quickly.

Taking care of any rust

First, you should make sure that there are no signs of rust. Wash your roof to get rid of dirt, and if you see rusted parts like washers or screws, replace them. Otherwise, use a wire brush to get rid of as much rust as you can. If some panels have a lot of rust, a professional may need to replace them.

Give it a lick of paint

By giving your roof a fresh coat of paint, you can protect it from rust even more. Start by using a primer that is high in zinc. This will help you seal it against moisture as well as possible. Before you start painting, make sure the roof is completely clean and washed. It can be kept safe by painting it every three years.

Add some coating

One of the best ways to keep air and water out and stop corrosion and rust from spreading through metal is to use layers of protection. Putting a coating on the roof is even better than painting it. There are three types of roof coatings: elastomeric, silicone, and acrylic.

The key is galvanization.

Using galvanizing roofing materials like melted zinc can give your roof a lot of benefits. Galvanizing it keeps it from rusting in a big way and also makes your roof stronger and more durable. It can also stop rust from getting worse if it has already started to form on a small part of the roof. All you have to do is put the material on the rusty spot.

If your metal roofing has galvanic corrosion, an experienced roofer like us would know how to stop it. We are one of the best roofing companies in the area, so you can trust us to take good care of your home.

Paul Petersen