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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there are lots of metal roofs here (the majority), it’s just that metal has to be rust proof to be useful as a roofing material or you end up replacing the roof every year, I think cheap metal galvanisation is a rather recent process (in construction terms), also shingles are fairly cheap and easy to install/replace
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