Why do we need roofs on houses? Why can’t we just build it flat on the top?
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Slanted roofs move rainwater and snowfall much better, helping prevent leaks. Even flat-roofed buildings have a little bit of slope to help move water. Also, having a vented attic helps have a buffer zone for the heat that builds under a roof on sunny hot days, helping with energy costs. This doesn’t mean flat roofs on single family houses don’t exist.
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