You don't want that much snow on your roof :-(
Back in Edinburgh 2010, I had about 15 inches of snow on mine. Snow is a great insulator as igloos show. 1950s British house roofs aren't brilliantly insulated. Thus the bottom layer of snow on the roof started to heat up, began to melt and blocked by the rest of the snow above it, found it's way through the tiles and gaps and into our ceiling 😞 Still, we claimed it as an insurance job, extreme weather