A lot of people question the difference between Galvalume metal and Galvanized metal, especially when it comes to roofing and wall projects. Similarly, people want to know the pros and cons of each metal, and if it’d be better to use one over the other on their current project. Let’s shed some light on these differences, and for future reference, learn which metal type is best for what use.
What are the Differences?
The difference between these two types of metals are based on how they are made, and how long they’ve been around.
Galvalume metal was invented by Bethlehem Steel in 1972, and refers to a sheet of metal that has been coated in galvalume; a carbon steel base product is repeatedly hot-dipped into the alloys of aluminum and zinc. The coating the metal ends up ensures the product is made up of 55% aluminum, 43.4% zinc, and 1.6% silicone.
Galvanised metal refers to a sheet of metal that has been coated with zinc via hot-dipping. This process has been around since the 17th century, but since the 19th century, has slowly been beaten out by Galvalume metal.
The Benefits of Galvalume Metal
Resistant – Galvalume metal has a much higher corrosion resistance, compared to Galvanized metal. Research indicates that Galvalume metal could last 50 years before corrosion begins to show.
Affordable – Galvalume metal is very reasonably priced, and one of the most affordable products on the market. Prices generally start at $5.00 per square foot.
Self-healing – The edge creep on Galvalume metal means it can heal from red rusting at the edges when cut to shape, and any discoloration will not grow over time.
Where is Galvalume Metal Best Used?
One of the most common uses for Galvalume metal is commercial buildings; classical styles of architecture where a metal roof is the sturdiest, most safe option on the market for the intended use of the space. Supermarkets, hospitals, and schools all fall under this.
Similarly, residential projects often rely on Galvalume metal for their roofing needs. Modern buildings, such as condos, are best suited to both the look and durability of Galvalume metal.
The Benefits of Galvanized Metal
Affordable – While a little more expensive than Galvalume metal (about a 6% increase on the latter’s price pint), Galvanised metal is still affordable. The price will fluctuate based on thickness of the steel, the color, and what it costs to install.
Longevity – When placed in the right environment, galvanized metal has been known to last decades. This environment is usually a dry climate, with little nearby air pollution or coastal/sea spray issues.
Where is Galvanized Metal Best Used?
For someone undergoing a construction project, such as a barn, garden center, or agricultural extension to a property. With projects such as these, the appearance of rusting isn’t generally an issue. Even in terms of general architecture, galvanized metal can be the best material for any roofing needs, if the designer in question is going for a rustic style.