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Metal roofs often benefit from snow guards because the slick surface can lead to snow avalanches off of your roof, potentially damaging cars or personal property below and putting your family at risk of injury. Low-slope metal roofs may not require snow guards if your area doesn’t see heavy snow accumulation, but it’s a good idea to install them for security.

In the right conditions, a steel roof can easily last 50 years or more. However, your environment and maintenance play a large role in the lifespan of a steel roof. For example, if you live under a large tree that frequently drops limbs, your roof will last much less time. Metal roofs near the sea degrade faster as well due to salt in the air.

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.

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.