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When properly installed and maintained, a metal roof can last 50 to 80 years. However, the fasteners used to attach the roof may have a shorter lifespan than the roof panels, so it’s a good idea to inspect your roof every few years to check for wear and replace any damaged components. Metal roofs installed over shingles don’t last as long as tear-offs since the underlying roofing components can deteriorate over time, and the added weight can stress roof supports.

Generally, magnets do stick to a metal roof, though certain metals may not be magnetic. In that case, you can use self-adhesive hooks designed for outdoor use or plastic clips that hook onto your gutter or the edge of your roof. But if your metal roof is made of steel, aluminum, or copper, you're in luck—those are all magnetic metals.

Roofers most often use nails to fasten roofing shingles and other roofing materials. Nails have more holding power than staples and offer better weather resistance and longevity. However, it is possible to use staples instead of nails when installing a roof. Staples are less expensive, but not as high-quality.

A metal roof will last for an average of around 50 years—usually between 40 and 75 years—which is about double the lifespan of an asphalt roof—between 15 and 30 years or 25 years on average. Installing a metal roof is usually more expensive than an asphalt roof, with an average cost of $11,400 compared to the $9,200 for an asphalt roof. However, given that a metal roof costs about 20% more and lasts twice as long, it’s typically well worth the investment and should save you money in the long run.