How To Paint A Galvanized Metal Roof

Galvanized metal roofs are coated with a layer of zinc that inhibits rust.

How to paint a galvanized metal roof.

If you are preparing to paint a rusted galvanized metal roof pay special attention to surface preparation or you will have a recurrence of rust and or flaking. The enamels in alkyd paints can react with the slick zinc finish on a galvanized steel surface leading to poor adhesion and peeling. You ll also need to purchase a primer designed for metal roofs. Apply the sherwin williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal.

Painting a galvanized steel panel roof is not all that different from painting other metal objects but you must ensure that the surface is perfectly clean before beginning the application process. Galvanized roofs require the use of a different paint than what is used on terne metal. To paint a metal roof you ll need to use an oil based paint if you have a terne metal roof or an acrylic based paint if you have a galvanized metal roof. Unfortunately over time this coating can fail leading to minor rust outbreaks.

If crawling around on a metal roof in the hot sun does. However paint on metal roofs often peels or rusts in which case it is time to repaint it. Avoid using alkyd based paints such as spray paint on galvanized steel. Go over the metal with a wire brush to remove any oxidation.

One of my neighbors used an oil based paint as a primer since some of the metal was rusted and then covered the roof with one of the specially formulated roofing paints that is sold by calbar for use on old. For the most dependable results look for paints that are formulated specifically to bond to galvanized steel. If you re not sure what kind of roof you have ask a professional roofer to inspect it before you paint it.