The only limit to how strong you can make a roof is really money. If you space joists or trusses half as far apart you will about double the max snow load.
The only limit to how strong you can make a roof is really money. If you space joists or trusses half as far apart you will about double the max snow load.
At a certain point the problem stops being the roof, and starts being subsidence of the ground under the increasingly-heavy building.
That would be a LOT of snow.