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There is a weight limit for walking on a roof, but it’s determined by your roof structure and not the roofing material, at least in the case of a metal roof. Consider that entire teams of roofers will be on top of your home during the installation, so the weight of a single person won’t compromise your roof. That isn’t the case for something like a tile roof, so a high weight limit is one benefit of a metal roof.

You should avoid choosing a metal roof if your home has a weak structural support system, as metal roofs can be heavier than roofs made of other materials. If you're in a region prone to frequent hailstorms or high winds, you also need to be aware that denting may occur.

A metal roof can last anywhere from 15 to over 100 years, with an average of 50 years, depending on the material, installation, and environment. The specific metal is a key factor: aluminum roofs may last 20 to 45 years, while steel can last 30 to 60 years. Tin can last for up to 75 years, and more durable options like zinc, stainless steel, and copper can last from 80 to over 100 years. Factors that can shorten a metal roof's lifespan include living in a coastal region with corrosive salt air, improper installation (such as laying over old shingles), and failing to inspect and replace fasteners, which may wear out before the panels.

Spray foam roofs don’t stand up well to impact, so they won’t last as long as something like a tar and gravel roof and other flat roof materials in areas where extreme weather is common. Due to the reduced durability, you’ll also need more frequent maintenance and repairs for a spray foam roof, and those costs will add up over time. Spray foam roofs are relatively uncommon, so you may also struggle to hire a roofing contractor who can install one.