Condensation water in the screed at supporting pillars and intermediate floor

Hello everyone, we were shocked to find that we have moisture in the screed on 2 support pillars as well as on the floor between the insulation (glass wool) and the wooden floor!

The screed itself, or the roof, is not insulated.
The ceiling of the upper floor, or the floor of the screed, is insulated as follows:
Thermal insulation with glass wool, insulation thickness 180mm.
Wooden sliding ladder as attic access. Ceiling covering with paneling 13mm.

In addition, we always have wet edges on the windows in all living rooms.

We fear that the screed floor, or the ceiling of the upper floor, is starting to develop mold and begin to rot. How can something like this be fixed?

Thank you very much for your help!

Hello Serla,

What is missing in the construction of the attic insulation is a vapor barrier; this prevents vapor and/or warm air from penetrating into the floor structure and condensing there - which, unfortunately, has now happened in your case. You need to change that; how best to do this: dismantle the paneling, install a vapor barrier, then reattach the paneling, or whether this can be done from the attic side, you should best ask a specialist who can look at it on site.

As for the windows: if the glass panes are wet at the edge near the window frame, it may be due to the edge seal (this is the connection between the two insulating glass panes); the edge seal in your windows possibly consists of a material that conducts heat relatively well, probably aluminum. You have to live with that, it could only be changed if you replaced the panes.

Finally, a question: Do you ventilate regularly? This is important even in winter.