ᐅ Moisture in the attic. Heat is coming from the interior wall.

Hello,

I wanted to install wooden paneling on my attic (not OSB boards, but boards with ventilation slots).
I noticed a spot where condensation is already visible even without the boards installed.
The heat is coming from the interior wall. The surface is not insulated, and the heat radiates in all directions:

Should our construction company have handled these areas differently? In some places, there are only a few centimeters (inches) of clearance upwards.
The house was built to KFW 55 standard. The ceiling is drywall, with a vapor barrier and a thick layer of insulation (wool).
What can I do with the masonry now to prevent the heat transfer?
Otherwise, I can’t panel this area, which is roughly in the middle of the attic.

Thanks in advance for any tips!
bwradar

A picture of the overall situation would be very helpful 😉

Here is the picture

So I understand you have a cold roof (an uninsulated attic), and the amount of heat supplied through the wall from the floor below leads to excessive humidity with condensation forming at the coldest spots?

Wouldn't it then be a good idea to professionally and properly insulate the entire attic, especially since the (necessary) thermal separation between the floor below and the attic has not been very effective?

Yes, exactly, that is the current situation.
I have already considered insulating the entire attic to minimize temperature differences.
If I do that, I fear that the attic will "sweat" even more without proper ventilation.

Is this really appropriate for a cold roof? Since the floor acts as the thermal envelope here, in my understanding there should not be any such thermal bridge.