New fan and everything is installed and sealed up.
Culprits are a couple big slits in wall vapour barrier that I missed. (Wall sheathing is soaked on inside)
And, the furnace flue goes right through the ensuite. With the old design it was hidden behind the wall behind the shower, but to make more space I took down that wall and redesigned it a bit. The unfinished wall is kind of hiding the completely unsealed area around the furnace vent pipe.
I feel kind of stupid for missing it, but under normal circumstances I don't think it would have been a huge deal. That massive cold snap and crazy temperature swing really got me.
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