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Dec
6
comment Water under the vapour barrier in the attic
If you are finding moisture under the barrier, then your attic isn't properly insulated, and the vapour barrier was not carefully installed. Water vapour is getting into that space and is condensing at a cold spot. I have seen one house where the bath fan wasn't detailed properly, so it was pumping water vapour into the atttic space.
Dec
6
comment Water under the vapour barrier in the attic
Wrong. At least contrary to code here. From the bottom up, a typical ceiling roof here has Paint -> drywall -> vapour barrier -> Truss. Then between and above the bottom cord 12-18" of loose fill insulation. All joints in the plastic are taped, all intrusions airtight.