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What Is Galvalume Metal Roofing

Galvalume metal roofing

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Galvalume metal roofing has emerged as a popular and versatile choice for both residential and commercial buildings. It is a high-performance roofing material that offers exceptional durability, longevity, and aesthetic appeal. Combining the corrosion-resistant properties of aluminum with the galvanic protection of zinc, Galvalume provides a superior protective coating for roofs, ensuring they withstand the test of time and various environmental conditions.

What Is Galvalume?

Galvalume, an aluminum and silicon roofing coating composed of the steel substrate, provides one of the longest-lasting options currently available, and its corrosion protection comes primarily from its aluminum content; moreover, galvalume contains over 50% aluminum content which helps makes this roofing material extremely corrosion resistant.

Galvalume coating was invented by Bethlehem Steel Construction Company early in the 1970s. This type of metal-on-steel adhesion process results in adhesion between materials. Galvalume comes with a plain mill finish or can be painted in various colors for customization.

Before galvalume plating, metals had only been coated in zinc to protect them against corrosion and natural elements like sunlight and water. Galvanized metal is more resilient to such forces.

Galvalume metal roofing

What Are the Applications of Galvalume?

Galvalume protects steel against oxidation (rusting), an irreparable process that compromises its integrity. Outdoor metal roofing and paneling installations, especially those exposed to hurricanes, high humidity levels, or excessive rainfall conditions such as hurricane-prone regions where hurricanes often hit, are two frequent examples where metal paneling comes in handy as an addition to exterior walls or building trim or as an accent feature, have long used it successfully as protection from corrosion and weathering damage.

Some of the standard applications include:

  • Commercial: Commercial real estate includes office buildings and shopping centers as well as hospitals, schools, supermarkets, and parking lots.
  • Residential: Apartments, condominiums, single-family dwellings, and detached outhouses
  • Industrial: Manufacturing facilities, warehouses, and storage rental spaces.
  • Agricultural: Storage buildings or enclosures designed for purposes other than animal use should also be provided for animals.

Galvalume can serve multiple functions beyond metal roofing and siding applications. Due to its superior heat reflection properties and corrosion protection properties, galvalume makes an ideal material choice for:

  • Appliance components: microwave oven frames, refrigerator drain pans, washing machine bases, and electric range vents
  • Vehicle Parts: cab housings, and mufflers

Galvalume should not be exposed to alkaline environments as this will compromise its aluminum coating. Furthermore, damaged galvalume won’t perform effectively and must remain undamaged to function effectively.

Galvalume metal roofing should not be installed on buildings inhabited by animals as their droppings will damage its protective coating over time and eventually compromise it.

Here are a few instances in which this kind of roof should not be recommended:

Environmental Issues in Marine Environments and Coastal Regions.

Galvalume cannot withstand exposure to large quantities of salt found in coastal air; thus, it becomes vulnerable to corrosion caused by saltwater exposure, making galvalume susceptible to corrosion damage and damaged over time.

Avoid installing galvalume metal roofing on properties close to coastal regions, large bays, marshes, and surf breaks, as aluminum provides better resistance against saltwater corrosion and rust than coated metal.

Livestock Housing or Enclosures

Galvalume roofing materials, like those coated in aluminum and zinc coatings such as galvalume, should not be used to house livestock or contain them. Their ammonia reacts negatively with this coating material, producing ammonia that causes corrosion on metal roofs and walls.

Galvalume metal will rust quickly once its protective layer wears off; to minimize ammonia from damaging it further. To mitigate against this risk, try opting for galvanized and pre-galvanized metals or insulated panels as an alternative solution.

Galvalume metal roofing

Keep your roof in top shape by calling us at 727-390-0717

Benefits of Galvalume

Galvalume is a premium material that offers many advantages when utilized properly, which may make it the right choice for many different situations and purposes. Galvalume metal roofing can be chosen for any number of purposes ranging from corrosion control applications to architectural applications.

Corrosion Resistance

Galvalume stands out for its corrosion resistance. Being composed of aluminum compounds, its coating offers increased corrosion protection when exposed to extreme conditions or high humidity levels. Suitable environments and climate conditions exist where this material would thrive, such as harsh environments with extreme environments like salt marsh areas.


The success of galvalume metal roofing can be attributed to its impressive strength-to-weight ratio due to its lightweight composition. Regardless of any bending or manipulation on sheet metal surfaces, its flexible coating won’t crack or flake off over time.

Energy Efficient

Galvalume roofing panels are highly reflective, resistant to extreme temperature changes, and suitable for various applications – saving both heating and cooling costs in one go! Investing in this material could save money!


Galvalume is an affordable solution and will last at least 40 years with minimal upkeep requirements, saving money over its lifespan.


Galvalume roofs offer superior longevity compared to their galvanized counterparts; galvanized may begin aging within ten years, while galvalume will only start showing its first signs after 20-30 years have gone by.


Its Galvalume can be utilized for numerous uses. The material can easily be bent, rolled, and stamped for different looks – even over asphalt roof shingles and wood underlayment!


Galvanized steel consists entirely of zinc coating. On the other hand, galvalume steel is composed of a mixture of aluminum, zinc, and a small amount of silicon. This composition gives galvalume an edge in terms of durability and resistance to corrosion compared to galvanized coating.

The breakdown of galvalume’s alloy coating is approximate as follows:

  • 55% aluminum
  • 43.4% zinc
  • 1.6% silicon

The addition of aluminum enhances the favorable properties of aluminum while providing better corrosion and heat resistance. However, it also reduces some of the galvanic protection, making galvalume more susceptible to scuffs and dents.

Galvalume metal roofing

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Are you in need of a reliable and long-lasting roofing solution? Look no further than Galvalume metal roofing installed by the trusted experts at Old Time Roofing. Contact us today to schedule your free consultation and embark on the path to a reliable and long-lasting roofing solution. Your satisfaction and peace of mind are our top priorities!

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Keep your roof in top shape by calling us at 727-390-0717