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Metal roofs do not technically require a drip edge if the roof overhangs at least one inch, because the roof's slant will cause water to flow away from the structure. But a drip edge would be an added level of protection for a metal roof to help keep moisture issues at bay.

Generally, to install roof flashing, you shouldn't use screws. Rather, it's best to use either roofing cement or nails. For the best results, match your nail type with the flashing materials. If you have aluminum flashing, use aluminum nails, and so on. You can use the same nails for your asphalt shingles and flashing.

The lifespan of a roof patch depends on which materials you use and the severity of the damage. Temporary solutions like tarps or plastic sheets last a few weeks to a few months, while roofing tape or caulk may hold up for a year or two. Permanent patches using roofing cement, flashing, or replacement shingles can last several years as long as they're properly maintained. Regular inspections and touch-ups can extend the patch’s lifespan, but eventually, a full repair or replacement would be needed.

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.