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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A lot of people are addressing the insulation question but the answer is economics. Insulation is cheap and easy relative to the roof. So if that were the problem just add more insulation in the ceiling or attic.
The problem is other materials are more costly for the material and labor. Metal roofs might last twice as long ( google says 40-70 years) but the cost is higher. I don’t know if it’s twice as high but it’s not a trivial amount. But people are really bad at looking into the future. It’s hard to imagine paying for a new roof in 20 years. It’s easy to see an extra $10k leave your pocket today. Add on to this that most people don’t stay in their house for 20-30 years. I think the average is around 10. And you probably won’t recoup the cost when you sell. While people do look at roofs when buying, it’s not going to be a sliding scale based on lifetime remaining. It’s going to be “oh brand new roof that’s good”, “roof isn’t new but it’s in good shape”, or “roof is in bad condition and will need to be replaced in <5”. So having 10 years left on an asphalt roof might not be treated any differently than having 30 years left on a metal roof for the typical buyer.
To add to this you can also have stone roofs (made from slate, I believe) that can last 100 years. But these are even more expensive and the time scales even more drawn out. So all the points above are even more applicable.
One last point is aesthetics. Shingle roofs are the norm and aren’t going to turn anyone off the house. Metal roofs are likely divisive. Some people might like the look more. I think a lot of people will like it less. I think most people will think a stone roof is beautiful, but these are so far out of most people price range it doesn’t matter.
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