Difference Between Galvalume And Galvanized In Metal Roofing Projects

Galvalume Versus Galvanized

Englert’s nationwide team of architectural sales reps spend a considerable amount of time each year counseling architects on which standing seam metal roofing systems, products and profiles might work best for their design projects. One of the questions most frequently asked by architects is: What are the differences between Galvalume and Galvanized Steel when used in roofing. It comes up so often, we thought we’d take a few minutes and use this week’s blog to explain those differences.

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First, a little bit of background. Galvalume® was invented by Bethlehem Steel in 1972. It is a trademarked name, but many people use it as a generic term to describe a metal roofing product consisting of steel coil coated with a metal alloy. That alloy is 45% zinc and 55% aluminum and looks similar to galvanized steel, but the visible crystals are smaller and close together, giving it a smoother appearance. Galvalume has a cousin, Galvalume Plus. The only difference is Plus has a thin, clear acrylic coating. Because Galvalume Plus can be roll-formed dry without vanishing oil, it is very easy to form and install safely.

The combination of zinc and aluminum in Galvalume enhances both the positive and negative effects of aluminum. 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.

Galvalume® is more corrosion-resistant than galvanized steel, but because aluminum provides barrier protection instead of galvanic protection, scratches and cut edges are less protected. Galvalume is offered in both bare and pre-coated versions. Most Galvalume®–like galvanized steel– is coated. But Galvalume has an excellent performance life in bare exposures as well. Both galvanized steel and Galvalume® weigh 100 to 150 pounds per 100 square feet and contain about 35% recycled materials. The cost of Galvalume and Galvalume Plus are about the same as that of galvanized steel.The coating used on Galvalume is very important because it is critical to the length and conditions of the entire warranty of the panel product. Coated metal roof panels have progressed from a single coat straight polyester paint system in the early years to Poly vinyl idene fluoride(PVDF) acknowledged as the premium resin for coil coatings. It is a kind of fluoride, a family that includes such well known products as Teflon and Halar. PVDF resin has superior chalk resistance and gloss retention as well as stain and chemical resistance. It is softer than polyester, making it highly formable without risk of cracking. Current pretreatments and primers along with superior paint coating have increased product warranties dramatically.

However, some people only ask if there is a warranty, not how many years the warranty lasts, and most people do not check to make sure that they are not getting the inferior straight polyester system. Straight polyester should really not be used for metal roofing and wall panel in today’s market. If you see there is a dramatic difference in the price of two painted Galvalume panels you are specifying, then the less expensive, less effective kind of coating should be suspected.

Galvalume should not be used on, in, or around concrete or mortar. Concrete and mortar are highly alkaline environments. Bare Galvalume and painted Galvalume sheets suffer rapid corrosion when in contact with mortar and concrete. Bare Galvanized and painted Galvanized perform better in this type of environment.

Neither Galvalume or galvanized substrate is warranted to be used, in or around animal confinement or agriculture. Bare Galvalume and coated Galvalume panels will very rapidly deteriorate when exposed to the corrosive agents of animal confinement. But bare Galvalume and coated Galvalume panels have an outstanding corrosion resistance in a wide variety of general environments, including industrial, marine and even severe marine environments. And Galvalume offers exceptional heat reflectivity, resulting in lower energy load on buildings and improved interior comfort.

That pretty much summarizes the key features of Galvalume versus Galvanized. In a nutshell, Galvalume is a proven metal roofing material because of its strength, outdoor corrosion resistance and longevity. If you have any other questions about Galvalume, contact Englert today.

Galvanized Steel Sheet is defined as a carbon steel sheet coated with zinc on both sides. Galvanized Steel Coil Importer produce galvanized steel with two main processes: continuous hot dip galvanizing and electrogalvanizing.

The hot dip process includes passing the steel through a molten zinc bath, and the electrogalvanizing process includes applying zinc through electrolytic treatment. As a result, the zinc layer is firmly adhered to the base metal through the iron-zinc bonding layer. Our hot-dip galvanized products are manufactured in accordance with specifications, and our electro-galvanized products comply with the specifications.

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Galvanizing is one of the most effective and economical methods for protecting bare steel from corrosive environments. Zinc is not only a barrier between steel and the environment, but also sacrifices itself to protect the steel plate below. When two different metals are in contact and coupled with water and oxygen, sacrifice or current protection occurs. Zinc preferentially corrodes iron in steel. This protection prevents corrosion of the steel in areas not covered by zinc. Therefore, the diffusion of corrosion from cutting edges, drilling holes, etc. is minimized.

Many people know what galvanized steel is. It is used for a variety of applications from HVAC piping systems to garden barrels. Home decorations to the trash. The shiny finish on the surface makes it visually appealing, but it is also more durable and corrosion resistant.So, how is galvanized steel made? Where did the sequins come from? Let's find out.

Galvanized steel is carbon steel coated with zinc. The most common galvanizing method is the hot-dip process. The hot dip process involves immersing carbon steel in a molten zinc bath (approximately 680 degrees Fahrenheit). When the material is removed from the zinc bath and cooled, it reacts with oxygen in the air. This reaction causes zinc to become part of the steel (iron-zinc alloy bond). The new surface finish seems to have a crystalline finish or a bright finish.

Although this is the most common form of galvanizing, because the thickness of the final product is not easy to control, it is usually used for previously manufactured steel. Another method of galvanizing process is continuous galvanizing.

After continuous galvanizing passes through the zinc bath, galvanizing will be performed on the surface of the continuous steel strip (coil). The coil runs at about 600 feet per minute. When the coil leaves the zinc bath, it takes away an extra layer of molten zinc. Use high-pressure air (air knife) to remove excess zinc to form the desired thickness. The material is then allowed to cool and form a shiny finish. Skip galvanized steel sheet and continuous galvanizing can control the thickness more accurately, and is usually used for steel that has not been manufactured. As the thickness of the coating increases, the risk of losing some of the coating during manufacturing or forming increases.

Hot Dipped Galvanized Steel Sheets and sheets are produced for applications where corrosion resistance is important. Zinc coating extends the life of the final product and is ideal for manufacturers. The attractive surface finish also makes consumers satisfied.

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