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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Metal roofs are superior imo. Mistakes and even water infiltration can happen if an installer doesn’t do it correctly, though. For example, the sheets need to be laid going “against” the wind as opposed to blowing up against the seam. You have to be careful not to over tighten the screws because the washer will fail. After it’s all screwed down, you have to caulk all the screws and eventually that caulk will degrade and it will need to be re-caulked. If all of that is done correctly and maintenance is kept up, metal roofs are by far better than 3-tab.
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