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Japan is tropical, which means that it gets a lot of rain. The distinctive curved roof structure that you can readily recognize as Japanese comes from the need to control that rain water. The upward curves on the peaks and corners of the roofs is a hydraulic device.

This is meant to throw the water farther away fron the footings of the building. ( they did not have foundations ). The water picks up velocity as it comes down the slope but if it continues on that plane it will hit the ground very close to the edge of the roof line, an upward slope sends the water away from the roof line in the same way a ski jumper is launched from the ski jump in the Olympic sport. Just imagine if that ski jump just ended as a straight line from the top, splat!

Also this design maximizes two concepts of light and heat, the curved roof allows the maximum amount of light while the sun is in the southern sky, while it also optimizes shade while it is directly overhead, as in summer, that is the main reason why they have such massive overhangs as well. It is all in response to a wet, hot climate.

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11y ago

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