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Moss grows in dark areas of roofs, including in corners and gutters. If left alone, it can grow under roofing and cause permanent damage. Here’s how to remove moss from metal roofs: 

• Soak the moss to soften it

• Scrub it away with a soft-bristled brush, or pick it off with your hands (be sure to wear gloves)

• Use a moss remover that’s compatible with metal roofing, following the manufacturer’s directions

• Remove dead moss and rinse the roof thoroughly

• Prevent future moss growth by trimming branches, cleaning gutters, and attaching zinc strips to moss-prone areas

While it’s less common than on other kinds of roofs, yes, ice dams can form on metal roofs. Metal roofs, particularly those with snow guards installed, can still accumulate ice at the roof edge, although ice dams on metal roofs are less likely to cause roof or interior damage than on traditional asphalt shingle roofs.

There are two main issues with metal roofs: the up-front cost and how noisy they can be when it rains. Metal roofs cost close to twice as much as asphalt roofs per square foot, and although you also get more than double the lifespan and more value from them, the initial cost is higher. Metal roofs can also create noise in your living space when it rains, so some homeowners install acoustic panels or insulation under them to reduce noisiness.

Metal roofs often benefit from snow guards because the slick surface can lead to snow avalanches off of your roof, potentially damaging cars or personal property below and putting your family at risk of injury. Low-slope metal roofs may not require snow guards if your area doesn’t see heavy snow accumulation, but it’s a good idea to install them for security.