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Most standing seam metal roofs last between 50 and 80 years. Certain high-end metals like copper or zinc can last up to 100 years if well-maintained. For the best durability, choose a low-gauge (thick) roof in a metal that works with your climate. Some are susceptible to thermal expansion and aren’t the best choice for all climates.

The green coloration that develops on copper roofs is called a “patina,” and it’s a result of mild oxidation on the surface. The oxidation process is not harmful to your roof. In fact, the surface corrosion acts as a protective layer and won’t spread to the core of your copper roof materials. The discoloration will progress much more quickly in damp or humid climates than it will in dry climates. If you don’t like the green color, you can seal your roof to preserve the shiny, rose-gold look.

A 26-gauge metal roof panel can span between 4 and 8 feet, depending on a few factors. Local building codes dictate what’s appropriate for panel span, but these are normally based on expected snow loads. Additionally, the type of metal roof you choose will affect the maximum span, as corrugated metal is stronger than flat standing seam panels or a screw down roof and can often span greater distances.

Asphalt shingle roofs are more likely to leak than metal roofs because they are more prone to uplift and damage from extreme weather, moss growth, and ice dams. Asphalt shingles also lose shingle grit over time, which decreases their waterproofing qualities. Metal is a more resilient material that will stand up better to strong winds and heavy precipitation, ultimately leading to a lower risk of leaking. As such, metal roofs add to home value with a higher ROI than asphalt roofs in most cases.