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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.

The average cost to repair hail-damaged roofing is about $4,250. However, depending on the extent of the damage and insurance policies, the cost can run from as low as $200 up to $32,500 or more. Repair costs also vary based on the type of roofing material, the size of the roof, the slope and other features of the roof, and your geographic location. 

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 green coloration that develops on copper roofs is called a “patina,” and it’s a result of mild oxidation on the surface. The oxidation process is not harmful to your roof. In fact, the surface corrosion acts as a protective layer and won’t spread to the core of your copper roof materials. The discoloration will progress much more quickly in damp or humid climates than it will in dry climates. If you don’t like the green color, you can seal your roof to preserve the shiny, rose-gold look.