How To Paint Old Metal Roof

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

How to paint old metal roof.

Sand the entire metal roof surface very lightly with your wire brush or. A wire brush or sandpaper may help loosen tough areas. Some historical homes have terne metal roofs and these need to be. Remove all rust using your wire brush or sandpaper.

Terne is best painted with an oil based paint. Choose a paint that s right for your metal roof. Metal roofing paints need to be made specifically for the conditions that they are going to encounter. 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.

Some homeowner s associations have rules about. 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. Choose a color that goes with the. 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 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. If no rust is present on the steel a simple pressure washing may be adequate to clean the surface of the 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. The first job was to scrape all of the loose rust dried paint chunks and old roof cement.

Galvanized roofs require the use of a different paint than what is used on terne metal. Check with your homeowner s association for any painting regulations. You can also use oil based alkyd paint but. Unfortunately over time this coating can fail leading to minor rust outbreaks.

Sweep away any powder left by the process and you are ready for primer and paint. Scrape away any loose or flaking paint using your putty knife. You cannot use any of your normal house paints to paint a metal roof.