How To Paint Old Metal Roof

Some historical homes have terne metal roofs and these need to be.

How to paint old metal roof.

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. 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. Galvanized metal roofs are coated with a layer of zinc that inhibits rust. Metal roofing paints need to be made specifically for the conditions that they are going to encounter.

Remove all rust using your wire brush or sandpaper. 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. Choose a paint that s right for your metal roof. You cannot use any of your normal house paints to paint a metal roof.

Some homeowner s associations have rules about. Galvanized roofs require the use of a different paint than what is used on terne metal. 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. A wire brush or sandpaper may help loosen tough areas.

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. The roof was power washed and a metal putty knife was used to scrape the rust and old paint. Check with your homeowner s association for any painting regulations.

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. Sand the entire metal roof surface very lightly with your wire brush or. Scrape away any loose or flaking paint using your putty knife. If no rust is present on the steel a simple pressure washing may be adequate to clean the surface of the roof.

The first job was to scrape all of the loose rust dried paint chunks and old roof cement. You can also use oil based alkyd paint but. 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.