I have encountered a strange problem and have troubleshooted extensively but can't find the source of the error, so I need some help. The house was built in '82

My wife's aunt noticed that it crackled in the lamp in the bathroom (not in the shower part), and when she unscrewed the bowl, there was a little water in it, and you could see there was some water in the wood around.

I went up to the attic where there is loose cellulose on top, and then fiberglass, no age-resistant plastic, and then the paneling. All the insulation was bone dry throughout, and the only moisture penetration visible was in one spot on the sheathing about 60 cm from the affected area (see picture no. 1). When I felt there, it was a little damp but not soaking wet.

Right where the electrical conduit comes in, you can see in picture no. 2 there is a small collection of water, but only there. I then went up on the roof and adjusted some tiles I thought were a bit off, and also re-sealed an old worn seal on a ventilation pipe from the sewer. I just did this since I was up there anyway, but it doesn't feel like the problem lies there as all the insulation is bone dry. I also tried to trace where the electrical conduit goes, as it almost feels like the water is coming from inside the conduit; I traced it quite a way but couldn't find any junctions, it wasn't easy to get there and I thought before I tear up more insulation to ask you. Do you have any theories on where the fault lies?

Grateful for any answers and thoughts.
Best regards, Nicholas
 
  • Damp wood ceiling showing signs of water damage and dark stains, possibly indicating a moisture problem above or within the structure.
  • Electrical conduit with slight water accumulation on wooden paneling in attic area with insulation visible. Possible water leak source near the conduit.
Prolonged condensation in the VP pipe collected in the lamp? If the VP pipe goes "shallow," i.e., close to the cold part up in the attic, it is quite likely that condensation can form.

Solution: Insulate thicker above the pipe, alternatively try to seal the pipe from below with, for example, a small plug of mineral wool so that no airflow can go through the pipe and condense.

My guess anyway.
 
I agree with norrbottenstorpet, it must be condensation forming in the electrical conduit as it goes from the warm to the cold side of the insulation.
 
And don't forget to fix your wet råspont. Do it now and don't wait.....
 
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