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24-gauge metal is thicker and will stand up better to impact, so it’s a better option for roofs that will see heavy snow and ice accumulation, hail storms, fallen tree debris, and blown debris. It’s a more expensive option, but it’s worth the added cost for roof longevity in extreme climates. If you live in a more moderate climate and don’t have trees overhanging your roof, 26-gauge metal is suitable and is a more affordable option.

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.

In the metal versus shingle roof debate, aluminum roofing has several advantages. However, aluminum roofing costs more than typical asphalt roofing, so up-front cost is a major downside. Aluminum is also somewhat susceptible to denting, and repairs can be more costly than for other roof types because your roofer will need to replace large panels rather than individual shingles. Aluminum roofs are also noisy in the rain, which some homeowners don’t like.

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.