Quote:
Originally Posted by
zbromer 
I had the exact same problem. Wet spot on my downstairs ceiling. Not big. Not soaked or bulging. A little damp and cold. It was not under a bathroom, and I didn't think there were pipes nearby. No signs of any issues to the floor directly above. I was clueless about where it was coming from.
Cut open the ceiling and found tubing installed in the ceiling. It was used to vent hot air from my dryer out the roof. It just snakes its way through the house. The tubing had become a little dislodged on the roof and was taking in just a little bit of rain water that wound up slowly dripping at some point in the tubing above the wet spot in the ceiling. Sealed up the vent issue on the roof and just fixed the small piece of drywall on the ceiling. Good to go.
I'd check your roof and see if you've got anything up there, like an AC or some other vent, that maybe is a little loose and allowing some water in.
Quote:
Originally Posted by
idfnl 
You need a hole you can really see in there with. Like 3 or 4" around. Flashlight. If you have to fix it, it makes no difference if its small or larger.
No evidence at all?
Turns out zbromer was just about dead on. The way my house is set up, there's actually a section of the first floor that's directly under the roof. That is, there's no second floor above it. The vents on the roof weren't sealed well, and it looks like that was the source of the water. The guy who came out to look at it caulked everything up, and it only cost me $30.
Now I just have to figure out why my heat decided last night to only run for a few minutes before shutting down.
