I have a second story bath, and a laundry room on the first floor below that bathroom. Only during cold weather (under 25-30 degrees) and while running a long shower, I'm getting a water leak from the ceiling of the laundry room on the first floor which is just under the shower. When ever the outside temp rises...problem goes away. The water pipes to the shower I believe run through the outside wall. Also, my wife likes to take very long showers. I'm wondering if it can be a pipe leak or condensation...
- can it be condensation: is it possible that during cold weather, the air in the wall is cooler as well and the pipes in the outside wall are forming condensation then dripping down on the ceiling below??
- can it be a leak: can a water pipe have a leak that is only affected by an outside temp. change? Like I mentioned...only seeing the leak when the weather outside is well below freezing.
A little background...I had this problem last year as well and I thought it might be a roof leak from melting snow on the roof. This past summer I had a new roof put on and added add'l attic ventilation (ridge vent, smart vent, etc.) so I'm ruling out the roof leak. I'm not seeing any leaks in the attic although I am seeing some droplets forming on the nails coming through the decking on the north side of the house. I'm in the process of painting the bathroom ceiling with a vapor barrier and upgrading the bath vent fans. I have all bathroom vents venting through to the roof, not the attic. I thought that seeing some moisture in the attic (on the nails) might signal that the water on the first floor was coming from there...but I don't think there is enough moisture there to cause the amount of water that I'm seeing in the laundry room which makes me suspect that it's the shower pipes themselves.
As for getting into the wall and checking it out...I have floor to ceiling tile in my bathroom and the laundry room ceiling has a pattern in the drywall...I was trying to figure out what route would provide the least post job clean up...I think either way I have some work to do.
The house is 2 story and was built in 1996.
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