Knowledge Builders

can you repaint a metal roof

by Prof. Kale Mitchell Published 3 years ago Updated 2 years ago
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How to maintain and repair a metal roof?

To repair a damaged metal roof:

  • Clean the hole. ...
  • Scuff the surface with a wire brush.
  • Cut out a patch of sheet metal to match the hole. ...
  • Place the patch over the hole. ...
  • Place urethane sealant inside the lines you traced. ...
  • Press the patch on. ...
  • Use pan-head sheet metal screws to attach the patch to the roof. ...
  • If desired, paint the patch to match the rest of the roof.

How to properly clean a painted metal roof?

  • Mix the “Glass Wax” product by shaking vigorously. ...
  • Soak a heavy cloth, or sponge, with “GlassWax”. ...
  • If a panel becomes difficult to clean, continue rubbing longer, but do not increase pressure.
  • When a panel section is clean, rinse the washed panels with fresh water.

More items...

Can You tar a metal roof?

Tar can actually be used on a metal roof, and many people slop the black goop onto valleys, roof-to-wall joints and plumbing vents to prevent or stop leaks, notes William Kibbel III, a home inspector and restoration consultant who serves as vice president of the Tri-County Inspection Co. in New Jersey, in an Old House Web article.

Can you paint a rusty metal roof?

You can easily paint over a rusted metal roof. Just make sure that the rust is only topical and has not affected the interior of the metal roof. If the structural integrity of the roof is affected by rust, you may need a new roof. In addition to revamping the appearance of the roof, painting over the rusted roof helps to prevent further rusting.

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When should I paint a metal roof?

I recommend that you begin scraping it during the later winter or very early spring and do the painting during the milder spring months while there are still cool mornings and temperate days.

What is a metal roof made of?

Many of us have made reference to an old farm house with a “tin” roof. Ironically, “tin” roofs are not made out of tin. Today metal roofs often consist of an alloy steel with a zinc coating applied to it for protection, known as galvanized metal. A current alternative trend in roofs is the use of aluminum. Available in a variety of color schemes, aluminum roofs require very little maintenance.

What type of paint is used on galvanized metal?

Galvanized metal requires either a zinc-dust type paint or a latex paint. My house was built circa 1880 and still has its original terne metal roof, which consists of individual metal shingles with an embossed decorative pattern. After many years of exposure to the elements, the paint on the roof began to wear off, crack and peel, ...

How many edges does a paint scraper have?

The paint scraper has four edges for aggressive scraping action.

What is terne metal?

Before you dive head-long into painting your metal roof you need to determine what type of metal it is, because although it may appear to be galvanized, it may in fact be what is known as terne metal. Terne roofing was made by producing the shingles or roof panels out of one of several different types of base metal and then coating the panel with a mixture of lead and tin. Terne metal has been phased out due to the public outcry about the dangers of lead, even though no specific health threat was ever discovered coming from the use of terne metal roofs.

Why do paint chips slide down the roof?

This was due to the steep pitch of the roof mixed with the vibrations created in the metal from the scraping. This helped to reduce my cleanup time considerably.

What is hand scraping a roof?

Hand-scraping also allows you to see every inch of the roof and to identify any small holes or other problem areas that need to be repaired along the way.

When Can a Metal Roof be Repainted?

All types of metal roofing are suitable for repainting, but it should be noted that newly installed metal roofs should not be changed for at least six months as they need time to weather.

Why paint a metal roof?

Whether you’ve recently bought a property with a metal roof or wish to change the color of your existing roof for the sake of aesthetic and energy efficiency, painting the metal roof naturally stands out as the most logical solution for the sake of your time, finances, and commitment to living an Eco-friendly life.

What are the properties of paint?

With so many brands on the market, it’s important to look for a paint that offers the attributes you require. Water resistance, fire resistance, insect repellent capabilities, and UV reflection are all properties you may seek. Application is a relatively simple task.

Can you spray paint on a steep metal roof?

You can use a sprayer to reach high or steeped metal roofs. Alternatively, rollers and paint brushes that are designed specifically for corrugated metal are equally capable of providing the quick coverage you crave. Only a few coats are needed, although you can usually judge this for yourself.

Can you paint a metal roof with jet power wash?

A jet power wash is the best way to achieve this, and can complete the task in a matter of minutes. When you want to change the color of an existing metal roof for ...

Do metal roofs need maintenance?

The fact that metal roofs require minimal maintenance is a very attractive feature, and is another reason for staying loyal to this material. Nevertheless, a little work can help extend the life of your roof by several years.

Can you paint over old paint coats?

Acrylic latex paint works well for bare metal roofs or painting over old paint coats. The combination of oil-based alkyd paint and a galvanized metal primer can work well too , ensuring that the paint is locked in and adhered in the right manner. With so many brands on the market, it’s important to look for a paint that offers the attributes you require. Water resistance, fire resistance, insect repellent capabilities, and UV reflection are all properties you may seek.

How to get paint off metal?

1. Use a paint scraper or a putty knife to scrape away loose paint. Press the scraper or knife firmly against the paint, but make sure you don’t damage the metal underneath. Don’t worry about patches where the paint is in good shape, as you can simply paint over those.

What to wear when going on a roof?

If you go on the roof, wear shoes that have good traction and try to stay away from the edges whenever possible.

How to stay safe on a roof?

Work with a friend to stay safe. Safety is very important when working from on your roof, so it’s best to have someone else with you at all times. Have someone hold the ladder from below to keep it stable while you’re working from it. This same friend can help you if you do have an accident.

How to prevent yourself from falling off of a roof?

Purchase a harness and rope at your local home improvement store. Anchor the rope securely to a stable part of your house or to a tree. Put on the harness and then attach the rope to it. With a harness, you can prevent yourself from falling off of the roof if you lose your balance.

How long does it take for a roof to dry?

Wait at least an hour for the roof to dry. How long it will take your roof to dry completely depends on the temperature and how sunny it is. Check the last area you washed after an hour. If it’s still wet, check again every 15 minutes or so. The roof needs to be completely dry before you move forward.

Does latex paint hold up?

It can hold up pretty well, depending on the type of paint you use. If you use acrylic latex paint and apply a primer, you can increase the chances of the paint staying on longer.

Can you paint a metal roof?

If the paint on your metal roof is starting to crack and peel or if you’re tired of its color, it might be time to paint your roof. Painting a roof can be a difficult job that takes a long time, so you should consider hiring professional painters to do the work. If you’re up for the challenge, though, you’ll need to make sure you have the right kind of paint, clean your roof, and apply several coats. All the effort will be worth it when you end up with a roof that looks brand new!

How to paint a metal roof

First off, let’s go over the benefits of painting a metal roof. There are a few that you should definitely be aware of.

Benefits of Painting Metal Roofs

Lower electricity costs- metal roofing in itself has been proven to absorb a lot of both heat and cold. So, if you paint it with these paints we mentioned earlier. The roofing will be able to absorb far more heat than without the paint applied. This benefit also helps with sustainability.

How to Paint Metal Roof

If you’re not interested in hiring a professional and want to paint your own roof, don’t worry. The process is much simpler than it seems.

Examine the Roof

Before you start, you need to make sure you determine the type of metal the roof is made of. It could be a galvanized metal or it might be known as terne metal, although the latter has been phased out due to the dangers of lead. If the roof is terne, it is best painted with oil-based paint.

Preparing the Surface

Scrape away any floating or loose paint using a putty knife. If you are struggling or encountering tough areas of paint, you can use some sandpaper or a wire brush. Make sure that you remove all the rust using the sandpaper or wire brush, sand the metal roof surface very lightly using the wire brush or sandpaper.

Clean the Roof

Make a simple mixture of one cup of mild laundry detergent or dish detergent to 5 gallons of water. Using some rags, apply this mixture to the roof being sure to remove any debris, dust from the sandpaper, or grease. Spray the roof with a hose to rinse away any debris.

Apply the Primer

After the roof has dried, coat the metal roof surface with a rust-inhibiting primer. Be sure that you choose the right product that states it can be used on outdoor metal. Apply this primer with a roller, follow it up with a paintbrush to access the harder to reach areas. Allow this primer to dry completely as per the instructions.

Paint the Roof Surface

Use an acrylic latex paint. Refer to the instructions and make sure that it is designed for outdoor metal. Using a brush or a roller, apply the paint liberally. Wait for the paint to dry and if necessary, apply a second coat.

What to do when you scrape paint off a roof?

If you're scraping large amounts of paint or rust, wear a respirator or dust mask for protection. Use extreme caution when working on the roof. Don't attempt this project on rainy or windy days, and use a harness or rope to prevent falls.

How long does metal roofing last?

Known for its strength and durability, metal roofing often lasts for decades with relatively little maintenance or repair. Over time, these roofs typically require repainting to restore their appearance and protect the roof from rust and corrosion.

What to wear when scraping paint?

If you're scraping large amounts of paint or rust, wear a respirator or dust mask for protection.

How to apply second coat of paint?

Wait for the paint to dry completely, then apply a second coat using a roller or brush.

How to get rid of flaking paint?

Scrape away any loose or flaking paint using your putty knife. A wire brush or sandpaper may help loosen tough areas of paint.

Steps to Painting a Metal Roof

This includes a ladder, a stiff brush or broom, paint pan, water hose with sprayer nozzle attached, safety goggles for yourself and any helpers that may be on the roof as well as an individual respirator mask.

Benefits in Painting a Metal Roof

Decrease the chances of rust spots and peeling paint. Provides a beautiful new look to your home’s exterior without spending too much money on expensive repairs!

What Kind of Paint to Use on Metal Roofs

As we discussed in this post, it is best to use oil-based paint when painting a metal roof. Oil based paints have a long lifespan and can keep your shingles looking like new for years!

When Should I Paint My Metal Roof?

It is best to paint your metal roof in the fall when it isn’t too hot outside and there are less chances of rain!

How Much Will It Cost?

On average, painting a metal roof should only cost around $200 per room. For best results with most paints, you will want to use an oil-based paint that is long lasting and can keep your metal roof looking brand new for years!

Paint Metal Roofs by Yourself or Hire a Professional?

Painting a metal roof is one of the best ways to keep it looking like new long-term!

Things to Avoid in Painting the Metal Roof

Do not apply oil-based paints directly onto your metal roof as that will cause damage over time due to moisture.

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