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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

The paint on a metal roof will last for about 10 years (the metal roof itself has a life span of 40 to 70 years). After a decade, the metal roof’s color may be more noticeably faded, and chips and cracks may start to form in the paint.

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.

The average cost of welding is about $300 per project. Welding project costs range from $125 to $490 on average, depending on the type of metal, the size and complexity of the project, and your geographic location. On the low end of the price range, you might pay $50 up to $1,200 or more. The type of metal rods used and the welding method also factor into the project’s overall cost.