Moisture seeps through the floor-to-ceiling windows in the new building

Have no insulation on the basement wall and ceiling?

The depicted area must have at least one coat of black paint or a bitumen adhesive membrane. In the upper floor, this is covered by the windowsill. But on the terrace, this is not possible if the height is to be the same as the finished floor level.

is that the concrete slab in front of the window? It looks red?

The red is the lettering of the "Mauerwerkssperre" - I hope that is the correct term... so this sealing tape that was laid between the floor slab and the masonry.

The depicted area must have at least a black coating or a bitumen adhesive sheet. In the upper floor it is covered with the window sill. But on the terrace this is not possible if the height is to be the same as the finished floor level.

Okay, thanks for the hint. Then I will point this out to the window fitter again. Or clarify whether this is even within his scope of duties or if, for example, the shell builder has to apply this bitumen adhesive sheet or black coating here.

I only know the masonry barrier exactly under the bricks. It does not go around the corner of the basement ceiling.

What is the structure of the basement ceiling and the basement wall? Is it sealed and insulated?

I only know the masonry barrier exactly under the bricks. It does not go around the corner of the basement ceiling.

What is the structure of the basement ceiling and the basement wall? Are they sealed and insulated?

The basement wall was shuttered and poured with concrete, afterwards it was coated on the outside with a "black" paint. On the paint, thick Styrofoam + drainage membrane was applied. I would have to ask about the basement ceiling.

In any case, as a layman I can say that the moisture in my picture is drawn into the interior through this masonry barrier. Here, snow lay on the barrier on the outside and got inside over the barrier. Because if you lift the barrier on the inside, only it is damp, the concrete floor underneath is dust dry – it has thus fully absorbed moisture...

Regards