Most of the rooves are designed to withstand a 60-80# deadload. There were a lot of new sounds coming from them.
In the picture, the snow has already compressed. The snow had little moisture because of the low (0-15 deg.) Temps. Not like an April or May snowfall that is loaded with water. Most oft the lake effect snow is that way...poofy. Even on the low end of your estimate, it's still heavy.
Keep in mind, the more he removes, the more concentrated the load becomes too.
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