Why do we need roofs on houses? Why can’t we just build it flat on the top?
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In some places you can but flat roofs hold precipitation, which can cause problems. If you live somewhere it snows a lot, snow can build up enough on the roof to cause it to collapse; you can mitigate this by periodically shoveling off the roof but… well, it should be obvious why that’s not preferred. Rain is less dramatic but can still be a problem: it’ll run off a sloped roof easily but will pool up on a flat roof, which can cause water damage and leaks over time.
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