Roof vent install causing crazy ice dams : HomeImprovement

Hey guys-

So 5 years back I bought my house in Montreal and the inspection showed that one of the two 2nd floor bathrooms was just venting into the attic. So after trying for a long time to get a roofer to fix it (no one was interested or would even show up) I did it myself. I installed a 4” vent (similar to Yay. Fast forward to March and the vent is causing crazy ice dams. What can I do to prevent this happened this year?


It actually got worse than this. This is the area directly below the vent

Edit: I should mention I have another bathroom that vents into a more cylindrical vent a few feet away and it doesn’t seem to cause any issues. I just can’t seem to find any of these vents.

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