Can You Paint Metal Roof – A corrugated metal roof is an excellent, hard-wearing choice for many DIY projects, such as building outhouses and sheds. This roofing material has a typical lifespan of 20-100 years if taken care of properly.
To maintain the roof’s integrity and condition, you must protect the metal with a layer of paint. With the correct paint and application technique, you can paint it once for up to 10 years of protection. Get started painting your corrugated metal roof below.
Galvanized metal roofs shed more easily than shingles or tiles, and this makes them useful in places where leaf, acorn and pine- and redwood-needle buildup is a problem.
Metal roofs do not need much maintenance, other than an occasional cleaning and – very occasionally – a fresh coat of paint. Make use of the right kind of paint and primer from Sherwin-Williams to ensure best results whether you plan to paint an old roof or a new one.
For a new and unpainted roof, allow it to weather for six months before painting it. If the project cannot wait, wash off oils and other remnants of the galvanizing process with a weak acid such as vinegar, diluted 50 percent with water.
Just before painting, wash the roof with a power washer at a pressure of 2,500 pounds per square inch whether it is a new or an old one that requires re-painting. Power washing removes mold, mildew and oils that interfere with paint adhesion.
It offers a time-saving alternative to scraping off old paint with a paint scraper and scrubbing the roof with a solution of water and trisodium phosphate, an option for cleaning without a power washer.
Type of Paint to Use
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. You can also use oil-based alkyd paint, but you need to first apply an undercoat of a galvanized metal primer such as Sherwin-Williams Pro Industrial Pro-Cryl Universal Acrylic Primer.
Use the primer even if you add a topcoat of acrylic latex paint, because the primer inhibits rust and bonds better than paint. Paint, in turn, bonds better to the primer than it does to the bare substrate.
Applying the Paint
Apply the Sherwin-Williams paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal. If crawling around on a metal roof in the hot sun does not sound like an ideal way to spend an afternoon, rent an airless sprayer to complete the project. Not only does a sprayer do a more thorough job than painting with a brush, it allows you to minimize the amount of time spent on the roof. If you spray, choose a windless day to paint.
You cannot set up roof jacks on a metal roof as you can on a shingled one, so if you plan to paint with a brush or roller, include a safe way to reach the ridge in your plans. If the roof pitch is more than a 4:12 pitch – which means a 4-foot rise in a 12-foot span – there may not be a safe way to do this without installing permanent anchors.
If you don’t want to do that, airless spraying with a 4- or 6-foot wand may be your only viable option. Even if the roof has a low pitch you should always wear slip-proof shoes when walking on it. For added security, wear a safety harness tied off with a safety line to something that can support your weight in case you fall.
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