Many metal roofs are made out of galvanized metal, which is a type of metal that has been covered with hot zinc in order to protect it from the weather. However, paint on metal roofs often peels or rusts, in which case it is time to repaint it.
Things You'll Need
- Putty knife or scraper
- Power washer
- Chlorinated bleach
- Warm water
- Trisodium phosphate
- Paint roller
- Galvanized metal primer
- Acrylic top-coat paint
Use your putty knife or scraper to scrape off any peeling paint or accumulated rust on your metal roof. Get off as much paint or rust as you can. When you are finished scraping, use a power washer and wash the rest of the debris off. You want to have a clean and paint-free roof when you are done.
Mix 1 cup of chlorinated bleach with 4 cups of warm water and 1 cup of trisodium phosphate (a cleaning agent). Use your sponge or paint roller to apply this solution to your metal roof. This will get rid of any mildew or algae. Wait until the solution dries, then rinse it off the roof with water.
Apply the galvanized metal primer to your roof with the paint roller. Wait until the primer dries completely before you begin painting.
Consider different top-coat paints depending on the climate. If you live in a moist or wet climate, aliphatic urethane coatings work best. However, if you live in a dry and hot climate, acrylic urethane is the best choice.
Use your paint roller to apply acrylic top-coat paint. Apply two coats in total, letting the paint dry between coats.
Tips & Warnings
- Less-toxic acrylic primers usually are recommended for galvanized metal roofs; however, solvent-based primers are just as effective if you choose to use them.
- If you are working with solvent-based paints or primers, always wear protective eyewear and gloves to prevent direct contact with the toxic solution.
How to Paint a Metal Roof
When preparing to paint a metal roof, there are a couple of issues any do-it-yourselfer should be concerned with. You must choose...
How to Prepare a Rusted Galvanized Metal Roof for Painting
Galvanized metal roofs are coated with a layer of zinc that inhibits rust. Unfortunately, over time, this coating can fail, leading to...
How to Paint a Galvanized Metal Roof With Sherwin Williams
Galvanized metal is a metal that is treated with hot zinc that is designed to protect the roof from the elements. Oftentimes,...
The Best Way to Paint a Metal Roof
The best and safest way to paint a metal roof is to hire a professional to do the work in a safe,...
What Is the Best Color of Metal Roofing?
Modern metal roofs are made to last—no color fading, rusting, or chalking if the right paints and protective finishes are used. Metal...