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Old 12-23-2008, 02:57 PM   #1
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mildew ceiling in bathrm


I bought a house that the previous owner renovated the bathroom; the problem is mildew on the ceiling (an upstairs full bath with a full attic above). I tried cleaning twice, but it came back pretty quickly both times. Then I decided to put a new coat of quality mildew resistant paint when I discovered that the previous owner screwed gypsum wallboard into the plastered ceiling (the walls are plaster and in very good condition). I think this has caused a moisture barrier between the new and old ceiling, and I don't want a tile ceiling. So, my question, do I pull it all down and start over with new green board and hire a plaster guy to finish or is there another way?

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Old 12-23-2008, 03:58 PM   #2
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mildew ceiling in bathrm


Does this bathroom have a fan? Is it set up to vent to the outside and not into the attic? Sounds like a high moisture problem (typical in bathrooms)that is going to persist regardless of what you do to the ceiling.

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Old 12-23-2008, 04:05 PM   #3
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mildew ceiling in bathrm


Good point, but yes, it does have a new light fixture with a fan that vents outside. The ducts are all clean, so that isn't the problem.
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Old 12-23-2008, 04:44 PM   #4
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mildew ceiling in bathrm


The fan is either inadequate for the size of the bath or it's not running as long as it should.
Fix that first, then proceed with your stated solution.
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Old 12-23-2008, 10:22 PM   #5
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mildew ceiling in bathrm


Ron6519 makes an excellent point. Most of the time this problem can be traced to not running the fan long enough. The majority of home owners after exiting the shower leave the room and turn off the fan, leaving all that moisture just sitting in the bathroom. I always recommend to my clients that we wire the fan to a timer, and that they leave it on for 15 mins or so after exiting the shower.
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Old 12-24-2008, 07:36 AM   #6
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mildew ceiling in bathrm


Make sure that there is insulation above the ceiling. A cold spot will allow moisture to condense on the surface, which is just what mold needs to set up shop.
Make sure that any moisture is not coming from above from a roof leak or moisture condensing inside the exhaust duct and dripping onto the top of the ceiling. Also, exhaust fans don't work if they aren't used. Be sure EVERYONE is using the fan.

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