How To Paint Old Metal Roof

How do i repaint a metal roof on an old house.

How to paint old metal roof.

Ospho will etch the surface of the metal and convert the iron oxide rust into iron phosphate an inert substance that turns the metal black. You can also use oil based alkyd paint but. Sweep away any powder left by the process and you are ready for primer and paint. Check with your homeowner s association for any painting regulations.

The first job was to scrape all of the loose rust dried paint chunks and old roof cement. Galvanized metal roofs are coated with a layer of zinc that inhibits rust. Remove all rust using your wire brush or sandpaper. A wire brush or sandpaper may help loosen tough areas.

The paint must be able to withstand boiling temperatures from the sun s rays as well as be fire proof water proof and able to fend off any pest invasions. Scrape away any loose or flaking paint using your putty knife. Although it isn t recommended to use a metal implement to scrape the roof it was the only way to remove the loose rust and old paint. 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 metal roofs for an added layer of protection.

If no rust is present on the steel a simple pressure washing may be adequate to clean the surface of the roof. Galvanized roofs require the use of a different paint than what is used on terne metal. Some homeowner s associations have rules about. Painted metal roofs come with a baked on factory finish and you can re coat these as well as paint bare metal roofing with acrylic latex paint.

Metal roofing paints need to be made specifically for the conditions that they are going to encounter. The roof was power washed and a metal putty knife was used to scrape the rust and old paint. Choose a color that goes with the. You cannot use any of your normal house paints to paint a metal roof.

Sand the entire metal roof surface very lightly with your wire brush or. Some historical homes have terne metal roofs and these need to be. Terne is best painted with an oil based paint.