What Is Galvanized Metal Roofing?

What is galvanized metal roofing? Galvanized metal roofing utilizes a processed steel that is more durable and stronger than other metal roofing. The word metal covers many applications including steel,...

The word metal covers many applications including steel, aluminum, copper, zinc, and stainless steel. Galvanized metal is a type of steel which has been coated with zinc to prevent corrosion. Because stainless steel is very expensive, galvanized steel offers a more economical but durable alternative and is a common choice for metal roofing materials.


Metal roofing expert Tina Montone of ATAS Roofing Company says galvanized steel is a high quality material and very durable for using in the architectural application of roofing. A process called hot-dipping is used to coat the steel with zinc and the designations G-30, G-60, and G-90 denote the weight of zinc coating the steel. The zinc protects galvanized steel from corrosion for at least 20 years and even helps repair and seal any cuts the steel may receive.




New technology has provided the product galvalume, which is steel with a combination coating of both aluminum and zinc, adding additional protection and ultimate weather resistance. Galvalume has now become popular in the United States, Canada, Mexico, Europe, Australia, and Asia as a roofing material.

While zinc, copper, and aluminum can all be used as metal roofing material, steel is the most popular because of its heavier weight and durability. Aluminum is another metal that will not rust but it requires painting for aesthetic purposes in residential applications, and there are some environmental concerns about the use of aluminum for roofing. Copper is another metal that does not rust and does not require painting. It is soft enough to form into a variety of styles; however, it is very expensive.

Metal, in all its forms, provides a very durable and long-lasting roofing material. It withstands the elements very well proving resistant to heavy rain, high winds, extreme temperatures, fire, and earthquake and requires little or no maintenance. Hail is one threat to metal roofing, but heavy gauge steel is impermeable to all but the largest and heaviest hail. Even when dented the water tightness of a metal roof is rarely endangered. One concern consumers may have is the danger of lightning striking metal roofing, but this is an ungrounded worry. Lightning always strikes the tallest surface and will not damage a metal roof. Since it is impervious to fire and is noncombustible, lighting is not a danger to metal roofing as it would be to wood shake shingling.

Metal can be more expensive than asphalt shingles, especially the heavier gauges and higher qualities, but it last two to three times as long and does not require the regular maintenance that asphalt does. Metal is one of the easiest roofing materials to install and is a cheaper alternative to clay and slate roofing, which share its resistance to weather and natural disasters. All in all, metal roofing has become a significantly popular choice in residential roofing and provides homeowners with long-lasting value and energy efficiency. Metal roofing can reduce cooling costs especially when painted a light color. Metal is also an environmentally friendly choice when it comes to roofing materials.

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