Question

Metal roof has minor rust in spots. What is the corrective action?

Answer 1

To correct minor rust on a metal roof, one must clean the rusted areas, apply a rust-inhibitor primer, and repaint the roof with a paint designed for metal to prevent further corrosion.

Step-by-step explanation:

If a metal roof has minor rust in spots, the corrective action would involve a few steps to prevent further corrosion and to repair the affected areas. Here's what you can do:

1. Clean the rusted areas: Use a wire brush, sandpaper, or a rust-removing solvent to remove the surface rust.
2. Apply a rust-inhibitor: After the rust is cleared, apply a rust-inhibiting primer to prevent further corrosion.
3. Repaint the metal roof: Once the primer is dry, apply a new coat of paint specifically designed for metal surfaces to provide prophylactic protection.

It is essential to keep the protective paint coat intact to shield the iron from water and oxygen necessary for rust formation. When paint is scratched or damaged, exposing the metal, it allows the electrochemical process of corrosion to take place, which can lead to rust forming as the iron is oxidized to Fe2+ and reacts with atmospheric oxygen. Proactively maintaining the integrity of the paint can effectively prevent this process and safeguard the roof.