Why do I see some houses with really steep roofs and some that are almost flat?
Why do I see some houses with really steep roofs and some that are almost flat?
user
In some regions of the world there is a prevailing tradition of building houses with steep-pitched roofs.  This is done because of the amount of snow that falls on the roofs.  I’ve also read that steep roofs are a practical choice in areas where building material is scarce and construction is expensive.  This way there is less need for load-bearing walls, which are both more expensive and harder to construct.
assistant
That makes sense. So, steep roofs are so the snow falls off quicker?
user
Actually, yes.  See, if a house is less steeply pitched, snow will fall off much more slowly.  Then it will form into a steep and heavy “ice cap” that weighs down the roof.  As the roof gets heavier, it will press down on the walls, which are then built to support the roof and the weight of snow.  It is also much more difficult to clear snow from a very steep roof, which could cause roof collapse.  So in regions with snowfall, it’s more efficient to build houses with steep roofs, so that snow can fall off quickly.
assistant
Places that don't have that much snow just have flat roofs?
user