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Can You Paint Galvalume Metal Roofing

What Is Galvalume Definition Uses & Comparisons

What is Galvalume? Steel, Substrates and Paint

Bethlehem Steel introduced the Galvalume coating to the construction industry in the early 1970s. Galvalume roofing material combines three of the most important metals used in roofing todaysteel, aluminum, and zinc. Manufacturers begin with a carbon steel base sheet that is then continuously hot-dipped with aluminum and zinc alloys until it reaches a coating consisting of 55% aluminum, 43.4% zinc, and 1.6% silicone. This process/product allows for one material to have some of the best characteristics of each metal, which is why its become one of the most popular materials in todays roofing market.

Galvalume may also be referred to as AZ-50 for painted and AZ-55 for unpainted sheet/coil, which refers to the coating weight.

What Is Galvalume Metal Roof

GalvalumeSteelmetal roofingsteelmetalGalvalumeGalvalumesteel

Unpainted Galvalume has a lifespan up to 40 years. Once corrosion has penetrated the sheet steel substrate of any steel roofing, the integrity of the steel will suffer and your steel roof will begin to fall apart.

Furthermore, can you paint Galvalume metal roofing? Galvalume will reject paint unless it is properly treated. Treat the sheet steel with an etching primer, or flaking will result. Once the Galvalume is properly prepared, you may apply a painted finish. Use a specific type of brush, or the paint may dry with noticeable, unsightly flaws.

Likewise, people ask, what is the difference between galvanized and Galvalume?

The main difference between galvanizing and Galvalume is that galvalume is a combination of zinc, aluminum, and silicon, while galvanizing is 100% zinc. Even after a few decades, Galvalume-coated steel will be less likely to rust than normal galvanized steel.

How do you clean a Galvalume metal roof?


  • Mix: 1/3 cup of powdered laundry detergent + 1 quart of bleach + 3 quarts of water.
  • Dip a soft brush or rag in the cleanser and apply to affected areas.
  • Lightly scrub the surface until the area is free of mildew or mold.
  • Rinse the surface well with plain water.
  • Product Misconception #: Pvdf Paint Systems Are Also Called Kynar

    One of the most common misconceptions out in the industry is when a polyvinylidene fluoride paint system is referred to as Kynar. While this is partially true, Kynar does not represent all PVDF products and is actually just one of the brands that use a PVDF resin formula in its products. Kynar is a product line owned by Arkema.

    For reference, PVDF is defined as the resin made up of about 70% polyvinylidene fluoride and 30% acrylic. PVDF resins are considered one of the best protective coatings available and stand up well to extreme temperatures, sun exposure, oxygen, humidity, and even pollution particles in the atmosphere. There are also coastal formulations and corrosive environment formulations of PVDF and are available as high-end and more expensive items.

    The way Kynar relates to PVDF is similar to how Kleenex relates to tissues. The word Kleenex is commonly used in place of tissue, even though Kleenex is just a brand name and not an actual product category .

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    Styles Of Metal Roofing

    What kind of look are you going for with your metal roof? Do you want it to look like a more traditional asphalt shingle or wood shake? Would you rather it look like scaled metal? How about flat sheets with raised ridges? You can have any style with a metal roof just remember that some material types, such as galvalume, doesnt retain the integrity of their protective coating when shaped into anything other than flat sheets.

    Can You Paint Galvalume

    Galvalume roofs painted vs unpainted


    . People also ask, can you paint over Galvalume?

    If you want to paint a Galvalume surface, consider a crucial point. Galvalume will reject paint unless it is properly treated. Treat the sheet steel with an etching primer, or flaking will result. Once the Galvalume is properly prepared, you may apply a painted finish.

    Also Know, what color is Galvalume? silver

    In this way, what paint will stick to galvanized metal?

    Most acrylic coatings will adhere directly to cleaned galvanized metal. A weathered galvanized surface develops a layer of white rust, which must be removed to ensure good adhesion of the coating. Wire brushing or scrubbing with a stiff brush or abrasive pad is recommended to remove the white rust.

    How long does Galvalume last?

    Most Galvalume® metal roofs come with a 25 year warranty if the metal roofing manufacturer is using Galvalume® with a full AZ55 coating. Despite the long warranty, a Galvalume® metal roof when properly maintained over its lifetime will last in upwards of 30 40+ years.

    Read Also: Where To Get Roof Trusses

    How To Paint A Galvanized Metal Roof With Sherwin

    Related Articles

    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.

    Advantages Of Painting A Metal Roof

    There are multiple benefits of painting a metal roof a new color. These advantages often influence homeowners to choose to paint their metal roofs a new color.

    • Repels UV rays

    Metal roofs conduct a lot of heat from the sun. When your roof isn’t prepped correctly, this heat can flow into the home, raising the internal temperature, causing your AC to work overtime. Painting a metal roof causes a chemical bonding that blocks UV rays, resulting in less heat absorption.

    • Sustainability

    Most metal roofs do not need repairs throughout their entire lifetime, which saves you money. But they will need a new coat of paint every decade or so. Repainting is an affordable and effective way to protect the metal’s integrity while giving your home a new look.

    • Aesthetics

    Because metal roofs last half a century or better, there are plenty of times when you may want to change the look. Paint is the perfect way to change how your roof looks without breaking the bank. The only limitation of painting a metal roof is using a product designed for your roof’s type of metal.

    Also Check: How To Waterproof A Flat Concrete Roof

    Advantages / Pros Of Galvalume

    Warranties One of the number one selling points of Galvalume is the 25.5 year warranty on the substrate, which may be referred to as a perforation warranty. Galvalume systems also often come with paint and substrate warranties that protect your investment and provide peace of mind that the roof or wall system will last. Plus, commercial property owners have the option to buy a weathertight warranty for their Galvalume roofing structure, which ensures the roof was installed correctly and adheres to strict installation details.

    Corrosion resistance When compared to galvanized metal, Galvalumes corrosion resistance is about two to four times better. Galvalumes formula was designed to combine the toughness and strength of zinc with the rust-resistance of aluminum. Research conducted by the Metal Construction Association indicates that Galvalume roofing could last as long as 50 to 60+ years without any extreme signs of corrosion.

    Self-healing properties All steel-based products have some degree of edge creep from the exposed steel when the coil is cut, but it can be offset by hemming or touching up exposed edges with paint pens. An advantage of Galvalume that stems from this concept is the fact that it has self-healing characteristics that help control the red rusting at the cut/exposed edges.

    Product Misconception #: Engineered Products Arent A Necessity

    What is Galvalume?

    There is a misconception out there that engineered metal roofing systems are more of a nice-to-have, rather than a necessity, which isnt true. In fact, at Sheffield Metals, we always recommend using an engineered system just to be safe and to ensure youre getting the most protection from wind, water, hail, fire, and otherwise.

    First and foremost, we want to mention that engineered metal roofing systems, which are tested in a third-party lab and adhere to strict metal roofing industry standards, might not be a necessity in some situations. However, engineered system or no engineered system, it is an absolute requirement that all buildings meet county/local building codes. Also, whoever is pulling the permit should be submitting documentation about the product they are installing as the new roof. .

    Engineered systems tend to be used more in commercial projects rather than residential because many localities require it and also because of the size, complexity, and functionality of commercial buildings. If you want to know if its a requirement for your home or building, contact your local building department to check. Even if its not legally required, you should always have the option to choose an engineered profile.

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    Is Galvalume Any Good

    Galvalume has barrier corrosion resistance and heat resistance similar to aluminized material and good bare edge galvanic protection and forming qualities like galvanized material. Consequently, Galvalume and Galvalume Plus will resist rust, the elements and fire while providing a sturdy and protective covering.

    Working On Your Roof Safely

  • 1Work from an extension ladder instead of going on the roof if possible. Its usually safer to work from a ladder instead of on the roof. Lean the ladder against your house. Keep the ladder away from power lines. Do not place the ladder in front of any doors, as someone opening a door could knock the ladder down.XResearch source
  • Always keep both feet firmly against a rung of the ladder, and hold onto the side of the ladder with the hand youre not working with.XResearch source
  • When painting from your ladder, dont try to extend your reach to paint areas that are too far away. This could cause you to lose your balance and fall.
  • Instead, use a paint roller with a long handle to reach patches far away from you.
  • 2Wear a harness with a safety rope when youre on the 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.XResearch source
  • 3Work with a friend to stay safe. Safety is very important when working from on your roof, so its best to have someone else with you at all times. Have someone hold the ladder from below to keep it stable while youre working from it. This same friend can help you if you do have an accident. Advertisement
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    Best Paint For Corrugated Metal Roof Review : Which One Is The Best

    Whats the best paint for corrugated metal roof? With so many types of paints available, it isnt easy to choose one. However, you cant just select any paint, especially if the roof is made of galvanized steel. If you want a metal roof that lasts a long time, choosing the right paint is essential.

    The reviews below include the top-rated paints you can use for a corrugated metal roof. Check them out and see which one is suitable for what you need.

    Yes Painting A Metal Roof Is Possible

    Diamond shingles in painted galvalume for wall cladding ...

    Out of all the many benefits of metal roofs, the most significant is extended longevity. These products can last for decades, but having the same color the entire time can get boring. Painting a metal roof allows you to change the look of your home without the steep cost of replacement.

    It doesn’t matter what type of metal roof you have, as they can all handle a coat of paint. But you do have to wait at least 6 months before applying any paint to change the color of newly installed roofs. The metal needs time to weather before it can adequately hold paint.

    You’ll also need to prep your roof before painting. In addition to power washing your roof to remove debris, dirt, and mildew, you can also use a diluted vinegar mixture to remove old paint residue.

    If you don’t have a power washer, you can use a water and trisodium phosphate mixture to scrub your roof and use a paint scraper to tackle any patches of old paint. This process takes longer and is more labor-intensive.

    You cannot paint a metal roof that has corrosion or signs of rust. But there are multiple tools you can use to remove loose rust scales. Sanders, grinders, wire brushes, or blasting work wonders.

    After you’ve removed all the particles, you can treat the rust with a phosphoric acid product. Or choose a paint with rust treating abilities . The type of paint you choose for your metal roof is also crucial.

    Read Also: What Is An Asphalt Shingle Roof

    Rust Blocking Is A Balance Of Substrate Coating Type And Thickness

    Manufacturers use one of two different rust-blocking coatings on metal panels, galvanized or Galvalume®. Your metal panels will have one of these two coatings applied between the steel core and the paint layer. If the paint is scratched, the rust-blocking coating is designed to prevent rust from reaching the steel core. Your 40-year warranty refers to paint only. Manufacturers may include a separate substrate warranty depending on the rust-blocking coating you choose. Ask the supplier if your quote includes a separate warranty for the substrate coating.

    How Long Does Metal Roofing Last

    One thing is for certain, metal roof panels are one of the longest-lasting roofing systems on the market today. Steel that has been galvanized with the hot dipping process can last up to 50 years with regular maintenance. Galvalume metal roofs regularly last over 60 years with minimal repairs and maintenance.

    Read Also: How To Install Metal Roof On Pergola

    Galvanized And Galvalume Steel Roofing

    It is important to note that base metals can be combined, coated, or layered with additional metals in a variety of bonding processes. Two popular roofing materials that use this process of binding two or more dissimilar metals are referred to as galvanized and galvalume, each of which use steel as the base metal. Iron or steel can be coated with zinc this is known as a galvanized metal. The zinc acts as a protective layer to iron or steel to prevent rust. Galvalume is aluminum and zinc coated steel. The combination of aluminum and zinc is used once again as a protective layer to the steel. Steel exposed by itself without other protective metal coatings such as aluminum or zinc turns a reddish- or yellowish-brown flaky coating of iron oxide that is formed on iron or steel by oxidation, especially in the presence of moisture. It is what we refer to as rust.

    Rust has been called the great destroyer and the evil. The Pentagon refers to it as the pervasive menace. It destroys cars, fells bridges, sinks ships, sparks house fires, and nearly brought down the Statue of Liberty. Rust costs America more than $400 billion per yearmore than all other natural disasters combined.

    Diy Painting A Metal Roof

    When is Galvalume® Not Right for You?

    Painting a metal roof DIY can be a straightforward process. You have the option to apply the paint using a sprayer , paintbrushes, or rollers designed explicitly for corrugated metal. Luckily, metal roofs only require two to three coats of paint in most cases.

    You should not use interior or the same exterior paint you used on the other parts of your home. These types of paint will not perform well enough to withstand the elements.

    If you are walking up on your roof, you should wear a properly fitting safety harness and non-slip shoes. These items will protect you in case of accidental falls. If your roof has a pitch of 4:12 or more, you’ll be safer installing permanent anchors while working at the ridge.

    You will save money on labor by doing it yourself. But if you’re inexperienced, you could end up costing yourself more money in the long run if you make mistakes that a professional painter has to fix. It can also be dangerous to attempt without supervision from an experienced roofer or painter.

    However, you will pay more for materials since most professional painters buy their products wholesale, allowing them to get better bargains. You’ll also have to pay for equipment if you don’t want to spend hours prepping and painting by hand.

    Also Check: How Much For A Porch Roof

    What Is Galvanized Definition Uses & Comparisons

    Galvanized metal products have been around since the 17th century, but the process of galvanizing materials became a wide-spread practice in the early 19th century. Galvanization is a protective zinc coating that is applied to a steel or iron substrate through a hot-dip galvanizing process. Before the introduction of Galvalume to the metal roofing industry in the late 20th century, using galvanized sheet and coil was a common practice. However, because of the superior durability and corrosion resistance of Galvalume, 90+ percent of the metal roofing and wall industry in the early 2000s transitioned from galvanized substrates to a Galvalume substrate.

    Additionally, galvanized metal sheet/coil may also be called G-90, which refers to the coating weight.

    Disadvantages / Cons Of Galvalume

    Oil canning Oil canning is an inherent characteristic of light-gauge, cold-formed metal products, especially products with broad flat areas. It is a visual phenomenon seen as waviness or distortion in the flat surfaces of metal wall and roofing products. Oil canning is only an aesthetic concern that does not affect the strength or performance of the system. This occurrence is a possibility for any kind of metal roofing or walls, including Galvalume. But there are methods to minimize the appearance of oil canning, including:

    • Hiring an experienced contractor who knows the best material handling practices that help reduce oil canning
    • Buying trustworthy brands of coil
    • Using striations or bead stiffeners in the flat area of the panel to minimize the appearance of oil canning

    Interactions with Other Materials Combining different metals on a metal roof system can actually lead to interactions that could result in early degradation, staining, and potential failure of a system altogether. Galvalume performs best when not in contact with copper, bricks, treated lumber, iron, and concrete. If Galvalume is in contact with one of these and is then introduced to an electrolyte, such as water, it can lead to galvanic corrosion of the metal.

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