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Yes, a drip edge is necessary on a metal roof, according to the International Residential Code (IRC). Drip edge flashing prevents water from dripping onto and behind your fascia board, which prevents the board from rotting and reduces the risk of water damage behind it. On gable ends, you can either install drip edge flashing or gable-end flashing to avoid the same issues.

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

Metal roofs are dangerous to walk on, even for professionals. Metal shake does offer some texture to help with grip, but metal itself is extremely slippery, especially at a medium to steep pitch, so call in a pro rather than getting up on the roof yourself. They’ll have the necessary safety equipment and experience to avoid injury.

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.