Quote:
Originally Posted by Myka
Ya, that's why I can't have one...at least not with the nice polycarbonate.  Anything that holds snow here has a steeper pitch. Of course there are pergolas, but they don't have a roof. I want both like you...! 
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Actually the ground snow load in Vancouver is higher than saskatoon (believe it or not!)
Though that said having a pictched roof is better... you could do a gazebo instead of a trellis... or a sloped trellis, you don't need much slope. you want to remove the water that melts from the snow, that is what causes the problems more than the snow.