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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The Romans used pan-tiles. Tiles are used everywhere in Europe. Also Welsh slates were used everywhere in victorian/Edwardian times. Thatched roofs are still around. ASbestos (fibre-reinforced) cement corrugated roofing sheets ‘roofed the world’ not very long ago.
I’ve no idea why they use shingles in the USA; I don’t recall ever seeing a house with a shingle roof in Europe. It’s very strange.
>I get that metal conducts heat more easily,
Also high emissivity. It absorbs a lot of heat from direct sunshine and gets dangerously hot if insulated. It also radiates heat to the sky on clear cold nights and gets colder than the air temperature. You then get condensation forming on the inside surface and possibly ice. It can be done but there are problems.
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