Why do we need roofs on houses? Why can’t we just build it flat on the top?
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You can in some places. But a flat roof in areas where snow is common is dangerous, as the snow will accumulate on top of it and can collapse the roof. Pitching the roof also helps rainwater run off; rainwater that runs off quickly doesn’t have as much time to soak into or through the roof, causing damage to the attic/house.
Flatter roofs are most useful in places that don’t see a lot of precipitation, like deserts.
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