Is the floor still too wet or is it already normal?

No more remote diagnoses. This should please be examined by a bricklayer, an engineer, or similar.

Enough with remote diagnoses. Please have a bricklayer, an engineer, or someone similar take a look.

Expert, no bricklayer please. With the mold pattern and the condition "Still not dry," this needs to be done properly once and for all.

What do you mean don’t spend the money, we already had a dryer running for 10 days and our thermometer showed 55%.

1 dryer, 10 days, that is too little. 55% at what temperature? If you are sure no water is coming from outside: heat more, ventilate more and/or set up a dryer. Do not wallpaper.

Exactly one year ago, we were also in this situation. For us, it looked even much worse at times... constantly wet spots formed in the corners (top and bottom) and very severely on the skylight window. I was worried back then too. I always went up to the corners with a cloth and wiped away the moisture. Additionally, I ventilated repeatedly. That helped very well and it gradually got better. For monitoring, I always kept a hygrometer nearby. We have been living here since June... and today there is no more moisture in the corners and on the skylight window.

The plaster and screed were installed in November..
On February 22nd, it still looked like this (see pictures).
At the end of April, the floorboards were finally allowed to be installed.
Fortunately, we were not under time pressure.



Best regards, Steffi.