Moisture - Roof structure - Wall and wood

Have a nice Sunday

I am new to the forum and not really a construction expert (but I can do painting, wallpapering, etc.. )

New build: Construction started November 2011 - move-in December 2012

Roof:
- Insulation is on the attic floor, under the insulation is a blue foil = everything dry.
- The roof itself is not insulated from above. It only has a gray foil on it and on both sides of the slope there are each 2 "ventilation shafts" installed.
. The attic itself is therefore very cold in winter. You feel a constant draft.
(sorry for the amateur description)

Problem:
- On the wall (north side) the brick (Bisotherm) is slightly damp in the area of the crossbeam (which runs along the wall)
- There is a gap of about 0.5 cm between the wall and the beam.
- The beam is also slightly damp. (no visible signs of mold yet)
- Otherwise no moisture detectable elsewhere. Insulation (glass wool? rock wool?) at the spot dry (but it does not rest against the wall but against the wood), also the foil.
(this also ends at the beam)
- The room under the roof is dry at the affected spot (so no visible moisture damage)

Question:
- Is something like this normal and falls under residual moisture (sweating) or
- should one get alarmed?

Many thanks for your answers and help

hi, send a photo. however, the first beam should be at least 6cm away from the wall to fit 6cm of insulation there...was a [Ringbalken] poured (concrete) there? then it could be residual moisture...

Here you can see the roof structure in the shell construction stage.
It is not a ring beam.
The roof is planned as a cold roof.
The insulation lies on the floor.
There is no insulation between the masonry and the beam.
Could it be that warm air from the room condenses on the cold wall in the area of the attic?
A vapor barrier in the form of a blue foil is laid up to the beam (the insulation lies on this foil).
The ceilings of the rooms below the attic are about 5 cm thick but are not intended as load-bearing ceilings, i.e., the attic cannot be converted.

Here is another view from a different room.

morning Johnny,

actually, there should be no problems with thermal bridges there (bisotherm), although I generally find this solution of the collar beam layer unsightly. My suspicion: holes in the vapor barrier, more likely: vapor barrier not well glued/plastered! And so the warm moist air can condense on the cold surface. Tip: open a small spot of plaster and check. According to DIN, the foil must be glued (special foil adhesive, flexible, not acrylic) and the plaster must be installed with a fabric or expanded metal...

Homi's contribution sounds very reasonable: I also think that the vapor barrier was not properly installed.