Leaking bathroom fan

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swimmer_spe

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My bathroom fan vents through the roof, The vent wasn't insulated. Last week, it was. There used to be water dripping through the drywall, but is no longer dripping there.

Now, it is dripping from the actual fan. Turning the fan on will blow it out, but then it seems to come right back.

What is causing this? How can I fix it?
 
I use semi-rigid duct, and I bend it to create a kind of trap. If any moisture collects in the duct, it will sit in the trap and likely evaporate as the fan is used.
 
joecaption said:
Likely someone did not wipe out the hose and the inside of the fan before insulating.
Click to expand...

If that is the case, would popping out the fan and running a rag through the duct solve the problem?

jeffmattero76 said:
I use semi-rigid duct, and I bend it to create a kind of trap. If any moisture collects in the duct, it will sit in the trap and likely evaporate as the fan is used.
Click to expand...

Well, I cannot do that. Or at least, I am not about to do that.
 
There are many different ways it can enter, I’m guessing that it is most likely caused by an improper vapor barrier over top of the insulation. It is probably allowing the moist inside air to condense inside the vent before it exits the house OR it is allowing the moist attic air to condense on the colder vent pipe and crate moisture to enter the house, water can collect in other ways too but those are probably the two most likely causes.

Is water entering through the roof jack? This can cause water to run down the pipes and enter through the house through a seam or through the fan. Installing the insulation could have provided a channel for the water to enter through the fan where before it would drip through a seam or hole in your vent.

Do either of those sound probable from what you have seen?
 
pjones said:
There are many different ways it can enter, I’m guessing that it is most likely caused by an improper vapor barrier over top of the insulation. It is probably allowing the moist inside air to condense inside the vent before it exits the house OR it is allowing the moist attic air to condense on the colder vent pipe and crate moisture to enter the house, water can collect in other ways too but those are probably the two most likely causes.

Is water entering through the roof jack? This can cause water to run down the pipes and enter through the house through a seam or through the fan. Installing the insulation could have provided a channel for the water to enter through the fan where before it would drip through a seam or hole in your vent.

Do either of those sound probable from what you have seen?
Click to expand...

The moisture vapor, shouldn't it bee below the insulation? How do I install a vapor barrier at the hole?

Roof jack?
 
Condensation, Heat, Melted Snow? Find the source and let us all know.
 
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