Eli5: Why do houses have a triangle shaped roof? Why not flat?
In: Engineering
It’s easier to make a waterproof roof if you can overlap shingles and have water only running from the top one to the bottom one. If you have a flat roof, you have to perfectly seal the whole thing, often with hot tar, and it doesn’t look as good. You’d usually only build it flat if you want to use the roof as a floor for living area. In colder climates it’s also harder to get snow off a flat roof.
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