Damp spots washroom ceiling

Old 11-12-15, 10:44 PM
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Damp spots washroom ceiling

Hi everyone,
I have a question regarding a damp spot that has appeared in our bathroom, on the ceiling at the corner where the wall meets the ceiling. (Above a window)

I was thinking it was a roof leak, but have noticed that it does not appear to be wet during heavy rains. However, after shower, it appears to feel damp. So I am wondering if there could be another reason for this spot besides a roof leak. Perhaps condensation that is dripping? Only reason I think that is because it will feel damp after a shower even when it hasn't rained for a few weeks.

I have tried the attic but am unable to access that side of the attic. So any suggestions would be appreciated.

Thanks in advance everyone.
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Old 11-13-15, 03:19 AM
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Welcome back. Some basic questions. Do you use an exhaust fan while showering? Do you let it run after you get out of the shower to fully evacuate the moist air? If you have an exhaust fan, where does the air go? Roof? Gable? soffit? Is this moist place close to the exit point of the fan's hose?
Old 11-13-15, 03:25 AM
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I would still look toward the roof and see if there is a vent for the plumbing in the general area. The boot around the vent may have deteriorated. Once you get some tannin bleed through the paint, it will ebb from dry to wet and change colors with the alternating humid and dry conditions in the bathroom. Kind of like some shirts get darker when wet, the humidity from the shower changes the color after use use the bathroom. Let us know, you can usually do a quick observation from the ground to see if one is in the area.
Old 11-13-15, 05:40 AM
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Since it's an outside wall I'd also be checking to see if the gutters are clean if you have them, that the shingles have enough over hang and there not broken from someone putting a ladder against them, or missing.
In you area there also should have been Storm and Ice shield at least along the lower edge under the shingles.
What can happen is water can run down behind the fascia along the soffit and into the home.
Old 11-13-15, 06:04 AM
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If you did not have this problem during warmer weather and it is just now showing up with the colder weather, it could indicate a lack of insulation in that specific spot. Wind has been known to blow in through soffit vents and blow the insulation away from the outside walls.

In my experience, condensation in the attic and roof leaks don't coincide with taking a shower and leaks from above can often take a day or so to soak through the drywall.

Is there a soffit vent directly outside of that wet area?
How difficult would it be to get over to that area in the attic?
Is the bath fan vented to the outside, not the soffit?


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