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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.

When properly installed and maintained, a metal roof can last 50 to 80 years. However, the fasteners used to attach the roof may have a shorter lifespan than the roof panels, so it’s a good idea to inspect your roof every few years to check for wear and replace any damaged components. Metal roofs installed over shingles don’t last as long as tear-offs since the underlying roofing components can deteriorate over time, and the added weight can stress roof supports.

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.

A metal roof should hang over between 1 and 3 inches over the bottom edge of each roof slope. This helps keep dripping water away from your roof decking and fascia boards to reduce the risk of water damage. It also reduces the risk of longer overhangs bending under the weight of snow and ice.