Leaking ceiling

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swimmer_spe

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My roof is about 2 years old. I have a mansard roof.

Over a year ago, my bathroom fan was replaced and the ducting and vent was replaced as well.
Last winter, no issues. This year, a few times, the ceiling in the bathroom was leaking. It leaks between the fan and the wall, a distance of about 3 feet. They had to cut a 2 inch wide hole into the ceiling to replace the fan. It is leaking on the seem. It seems to leak on days when the weather is warmer than freezing, but, after a day, regardless of the temperature, it stops leaking.

Any ideas?
 
Need to fix the roof, not the ceiling. Probably a little mud went up through the seam of the drywall, so that is where the water stops. But need to fix where it enters. Could be the vent where bathroom fan exits on roof. But keep in mind that tit could also be unrelated to the fan.
 
oldognewtrick said:
When the fan was replaced, did they change the exhaust vent on the roof?
Click to expand...

Yes they did.

Steve123 said:
Need to fix the roof, not the ceiling. Probably a little mud went up through the seam of the drywall, so that is where the water stops. But need to fix where it enters. Could be the vent where bathroom fan exits on roof. But keep in mind that tit could also be unrelated to the fan.
Click to expand...

There is a board that was installed for the piece of ceiling to be put back in. Should I remove the board?

*****Edit to add *****

The fan is only 1 foot away.
 
Is it possibly condensation that is forming on the ducting and the running down? You need to pull the fan out when it's leaking to find where the water is coming from.
 
mabloodhound said:
Is it possibly condensation that is forming on the ducting and the running down? You need to pull the fan out when it's leaking to find where the water is coming from.
Click to expand...
:I agree:
Till you identify the source, all else is speculation. If you are not comfortable on the roof, call your roofer.
 
mabloodhound said:
Is it possibly condensation that is forming on the ducting and the running down? You need to pull the fan out when it's leaking to find where the water is coming from.
Click to expand...

oldognewtrick said:
:I agree:
Till you identify the source, all else is speculation. If you are not comfortable on the roof, call your roofer.
Click to expand...

There is a very small gap between the ceiling and the roof.
 
It still could be condensation. Warm air (which carries water vapor) from the bathroom and/or fan getting into the attic space and then condensing when it hits the cold underside of the roof. The water condensate then runs down onto the fan area.
 
mabloodhound said:
It still could be condensation. Warm air (which carries water vapor) from the bathroom and/or fan getting into the attic space and then condensing when it hits the cold underside of the roof. The water condensate then runs down onto the fan area.
Click to expand...

How can I fix that?
 
swimmer_spe said:
How can I fix that?
Click to expand...

My first suspicion is that they probably don't make a proper vapor barrier or insulate the vent through the attic properly (or both?). I've seen it before. If that is the issue you will probably see it leak more when you have a shower rather than days that you do not have a shower in that room.
 
pjones said:
My first suspicion is that they probably don't make a proper vapor barrier or insulate the vent through the attic properly (or both?). I've seen it before. If that is the issue you will probably see it leak more when you have a shower rather than days that you do not have a shower in that room.
Click to expand...

If I remove the chunk of drywall put back in, spray foamed the heck out of the area (As it is only a couple of inches between the drywall and roof sheeting), would that solve it?
 
swimmer_spe said:
If I remove the chunk of drywall put back in, spray foamed the heck out of the area (As it is only a couple of inches between the drywall and roof sheeting), would that solve it?
Click to expand...

Maybe... But only if that is actually the problem and not actually a roof leak or a leak somewhere else that is migrating over to that one location and deciding to come through at that point. And only if you manage to create a proper seal when you do that ( you only get one shot at it unless you have access to it somewhere else.) and only if you don't mind dealing with the potential mess that it creates.

Did they insulate the vent pipe at all?

If it's an improper vapor barrier should it not be covered under their warranty?
 
pjones said:
Maybe... But only if that is actually the problem and not actually a roof leak or a leak somewhere else that is migrating over to that one location and deciding to come through at that point. And only if you manage to create a proper seal when you do that ( you only get one shot at it unless you have access to it somewhere else.) and only if you don't mind dealing with the potential mess that it creates.

Did they insulate the vent pipe at all?

If it's an improper vapor barrier should it not be covered under their warranty?
Click to expand...

I don't know if it would be covered under warranty.

I don't know if they insulated the vent pipe, other than pushing the existing insulation around it.

I do not think the actual roof is leaking. I am thinking more and more it is condensation building up and then leaking through.
 
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