ᐅ Screed without functional heating after 7 weeks

Please, please do not ventilate at all during the first 3-4 days! After the screed is installed, it always becomes unbearable inside the house. The reason is the chemical reaction during curing. The water that condenses is not only from mixing but also a reaction product during curing. This lasts for 28 days with cement screed. When the screed has been in place for one week, ventilate by opening windows fully twice a day. Do not use the tilt position of the windows! Additionally, wipe windows and frames with a damp cloth or similar to remove moisture. Why it is so pronounced in one room, I cannot say, as I am not familiar with the building.

I am not aware of a ventilation log. There is the heating log.

The photos shown are completely normal. Wipe them down, ventilate. Spray drywall with anti-mold spray to prevent further growth.

Vicky Pedia schrieb:

Please do not ventilate at all during the first 3-4 days! After the screed is installed, the indoor environment can become unbearable. This is due to the chemical reaction during the curing process. The moisture that condenses is not only from the mixing water but also a byproduct of the curing. This process lasts 28 days for cement screed. Once the screed has been in place for a week, ventilate twice daily by fully opening the windows. Do not use tilt position on the windows! Additionally, wipe down windows and frames with a damp sponge or cloth to help remove moisture. I cannot explain why one room is affected more than others, as I am not familiar with the building.
I am not aware of a ventilation protocol; there is only a heating protocol.
The photos shown are completely normal. Just wipe down and ventilate. Spray drywall (gypsum board) with anti-mold spray to prevent further growth.

Thank you very much for the tips.
The screed has been installed since December 16, 2019. So far, no ventilation has taken place because there are no window handles installed yet. Should the ventilation be managed by the builder, or is this the homeowner’s responsibility? Regarding the existing mold damage, can this be considered a defect and used to insist on a complete replacement?

Then it’s about time. Due to the extreme humidity, the drywall panels are also warping.
Legally, the developer is responsible. But that rarely works out. So do it yourself, since it will be your home. At least then you know it’s done properly. Report the mold as a defect in writing. Treat it yourself before it’s too late. The developer won’t tear anything out, which leads to legal disputes, expert assessments, and issues you don’t need. This is the faster approach. Claim a reduction in value during the final inspection.
Which state or region are you building in?

Vicky Pedia schrieb:

Then it’s about time. The extreme humidity is also causing the drywall boards to warp.
Legally, the developer is responsible. But that rarely works out. So do it yourself, since it will be your home. That way, you at least know it’s done. Report the mold as a defect in writing. Treat it yourself before it’s too late. The developer won’t remove anything, which would then lead to legal disputes, expert reports, and things you don’t need. This is the faster way. Claim a reduction in value at the final inspection.
Which federal state are you building in?

Great advice, thanks!
We’re building in Berlin!

Gladly, good luck and feel free to ask more questions!

If it’s really a developer, then it’s surprising that you are allowed inside the house.
If not, building a house also involves some personal responsibility. After at most one week, you should have ventilated thoroughly by fully opening the windows at least in the morning and evening.
You probably have a window handle.