Featured Image

What is the Difference Between Galvanized and Galvalume Metal Roofing Materials?

Updated on:

Time to Read: 1 m 46s

It can be difficult to decipher which material is right for the job when it comes to metal roofing projects. When completing a roofing project with corrugated sheet, two of the most popular roofing materials are galvanized metal and Galvalume metal. Depending on your project specifications, each of these metal roofing products can provide significant advantages over lower-quality materials.
Check out our Galvalume Metal options at IMS!

What is Galvanized Metal?

Traditional galvanized metal roofing is a corrugated sheet of carbon steel with a galvanized coating. The coating is created by dipping the straight sheet in hot molten zinc. The zinc ions bond with iron molecules in the steel to create a shiny, rust-resistant surface finish. This process is called galvanization.
After the coating hardens, the sheet is put through a cold-forming corrugation process, which bends into parallel linear patterns. These “corrugations” give the sheet more strength and stability when installed as a roof.
Typically, galvanized sheet roofs are used mainly for agricultural buildings, where rust is less an issue and costs must be kept low. Galvanized metal roofs may also be used by architects looking for a traditional, rusted appearance in a new building.

Galvanized Metal Advantages

If you’re in the market for a high-quality metal that provides suitable corrosion protection, galvanized metal may be the ticket. Galvanized metal products offer a host of benefits, including:
  • Low maintenance
  • Economical
  • Enhanced strength
  • Long-lasting
  • Superior protection

What is Galvalume Metal?

Invented by Bethlehem Steel in 1972, the patented Galvalume manufacturing process is similar to galvanization but with aluminum and silicon added to zinc. As the coating dries, patches of aluminum and zinc molecules coalesce into a pattern across the surface of the sheet.
The aluminum areas provide corrosion resistance, while the zinc provides galvanization protection. The small amount of silicon helps the coating adhere to the underlying metal, even when cut or rolled into the corrugated shape.

Galvalume Metal Advantages

Galvalume metal products provide superior corrosion protection in any environment. Galvalume’s protective surface coatings guard against ice, rain, and snow better than galvanized steel products. Galvalume metal benefits include:
  • Excellent corrosion resistance
  • Enhanced heat resistance
  • Good strength
  • Heat reflexive
  • Cost-effective

Differentiating Galvanized Metal & Galvalume Metal Roofing Materials

Several key variations differentiate galvanized metal from Galvalume roofing metal products. Both metal roofing materials provide enhanced strength and stability over standard graphite and asphalt shingles, while Galvalume metal products offer enhanced corrosion resistance over standard galvanized metal.

Galvanized Metal or Galvalume Metal - Which is Best for Your Roof?

So, which one is better for a roof? There are pros and cons to each type.
The extra corrosion resistance of Galvalume means that scratches, bends, or cut edges won’t rust so quickly, and it also makes a better choice in rainy climates and salt air.
Paint does not adhere as well to Galvalume, so the aesthetics may not be as good. Also, Galvalume costs more than galvanized metal roofing – but the fact that a Galvalume metal roof provides double the life expectancy as a galvanized roof of the same thickness could make up the difference. For these reasons, Galvalume metal roofs are much more popular.

Contact IMS for Galvanized & Galvalume Metal Products Today

Protect your structure with premium quality galvanized and Galvalume metal products today. Contact IMS for corrosion-resistant Galvalume and galvanized metal products for your next project.
For more information on ordering galvanized or Galvalume metal roofing, visit Industrial Metal Supply.

Our website uses cookies. For more information on our cookie use, see our Privacy Policy. By continuing to use this website you agree to our use of these cookies. Accept