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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In other countries metal roofs are extremely common. You don’t need moss. Just a thermal insulation.
Most of regional Australia (+40c in summer all day) and almost all of the buildings are metal roofing.
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