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Leaking bathroom Fan/Light Sign In/Join 
posted
Our home is only about 5 1/2 years old, and we're having a problem with the fan/lights in all three bathrooms are leaking water. The plaster is even falling off of the ceiling in two of them. Anyone know what causes this and how it can be fixed?
 
Posts: 1 | Registered: Jan 11, 2014Reply With QuoteReport This Post
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Perhaps you are not asking your question as you meant to. If you have water coming from someplace the obvious answer is you have a leak either in the roof or upstairs plumbing and it should have been fixed a long time ago.

But you would not have asked such an obvious answer. What did you mean to say?
 
Posts: 7288 | Location: North MN & Northern AR | Registered: Oct 01, 2002Reply With QuoteReport This Post
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Bathroom vents need to be hooked up to a vent line, in order to extract steam/excess moisture to the out doors. If there is no vent hose/pipe hooked up this way, or if the vent just blows this moist air into the attic/or between floors, you are going to have moisture build up. Enough of this and it will cause damage and wetness to the ceiling plaster/drywall. Also saturating any insulation it hits and will cause mold growth eventually.
In addition, this time of year it can freeze as water vapor, build up as ice and then melt, and can give one the impression of a water leak.

Take down one of the fans, (turn off power first), and find out what is actually going on up there.
 
Posts: 9678 | Location: Plains & Mountains | Registered: Jun 08, 2003Reply With QuoteReport This Post
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I agree that its a condensation issue from the vent lines running though a unconditioned space. The cold air in the attic is condensing the humid air on the interior of the vent lines, turning them into pipes for the water to flow back into the fan itself. Excessive length of the lines to terminate outside the house may be adding to the problem by giving greater surface area for the moisture to condense on. Any chance you can provide a photo of one of the vent lines in the attic showing the damage and the run?
 
Posts: 2 | Registered: Jan 12, 2014Reply With QuoteReport This Post
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