Shingles need to be replaced every 10-30 year depending on wear and their type. It just seems so uneconomical and such a pain.
I get that metal conducts heat more easily, but couldn’t you just let a thin layer of moss grow on your metal roof and call it a day? Even if they dry out in the summer, I doubt metal + thin layer of dirt would conduct heat more than black shingles
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Shingles are pretty durable since they deal with sun, wind and rain for 10-20 years. they are also quite cheap. Metal roofs of course can last much longer but they can have much higher upfront costs and are more expensive to repair when they do get damaged.
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