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Metal roofs can rust, but steel is a material that holds up well to environmental factors, especially if it’s painted or galvanized. One of the main determining factors regarding rust is the environment the roof is in. Harsher environments with a lot of salt in the air will rust much more quickly than a steel or metal roof in a dry climate. Zinc-coated steel, called galvanized steel, is excellent at preventing rust from forming.

How long it takes to repair a roof depends on damage, but in general you can expect roof repair to take a few hours to a few days. For example, replacing damaged shingles can take between one and four hours. Structural repairs, like fixing a sagging roof, can take up to four days. 

Yes, you can walk on a standing seam roof, but you should avoid stepping on the seams and instead walk on the flat portions. The seams are thin and provide less traction, and they don’t get direct support from the roof decking underneath, so they’re more likely to dent from added weight.

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.