Windows in the bedroom fog up

Hello,

unfortunately, I have a big problem in my renovated farmhouse. Every morning, the bedroom windows are extremely wet on the inside of the glass, over the entire surface.

Now the cause must be found.

The following conditions:
1. Windows are new, double-glazed
2. No compressible tape on the outside and no silicone sealing (The window installer did not do this?!)
3. In the house, the following have been done: concrete, screed, walls, plaster completely) practically a new building within the old building
4. Pleated blinds on the window because of darkness and in front of them a curtain (distance to the window approx. 35 cm, I have very deep window sills)
5. Outer wall construction = clinker / cavity / calcium silicate stone / cavity / Ytong 17.5
6. In the area of the windows, the Ytong was placed “around the corner” against the window.

I have had the underfloor heating running for 2 weeks now and ventilate morning and evening by airing intensely for about 30 minutes. And yet I can’t get the moisture out. I also had minimal mold on the corners of the baseboards, which I successfully fought.

Since the underfloor heating has been running and I ventilate intensely, no more mold has appeared, but the wet windows worry me...

Humidity is in the range of 50-65%... If I can trust the device.

I have already considered buying an electric dehumidifier... Maybe that helps.

Best regards, Christian

Curious masonry construction. But it's better for the moisture to appear on the glass than on the wall or on any thermal bridges, e.g. your baseboard. Without knowing what I'm talking about, I would want to sell you a decentralized ventilation system.

Since you basically have a new building within an old building, you need to regularly ventilate in the beginning just like in a new building. There is still a lot of moisture in the house that will only disappear over time.

I agree with Koempy. And under these circumstances, ventilating by shock twice a day is far too little.

I agree completely. If you cannot air out more often, I would put in an electric dehumidifier..