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Not defending the other design choices, but there are places in snowy mountain areas where (almost) flat roofs are common [0].

Seems like the flat roofs in Davos were a conscious decision to safeguard against avalanches.

From the link: >" In order to guard against dangerous avalanches in snow-covered Davos, the houses were covered with flat roofs."

I wish they had detailed how flat roofs guards against an avalanche? What is the logic/physics at work there?

roof avalanches, presumably