Delayed heating program screed drying problematic?

Our screed should only be put into the heating program after three weeks at the earliest.

Can you ask the screed layer yourself?
With us, everyone said that whatever he says is what counts.

look what Klaus wrote. As an expert, he knows what he's talking about.

"Well, he told me that the screed upstairs is drying out too much and thus the moisture can no longer escape from the lower layers of the screed."
In my professional career, I have had to listen to a lot of nonsense.
This statement is just adding to that!
As long as a porous component, and a mineral screed belongs to that, is not surface-sealed, the water vapor pressure within the screed structure is always in correlation with the vapor pressure of the room air!
Regardless of how thick the screed is.
However, it can never be advantageous for a building if it is not heated during the cold months!
Gypsum-containing as well as cementitious building materials react to high relative humidity by absorbing moisture, which is reduced by heating the rooms.
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Regards: KlaRa

Off-topic: I thought that due to the low absolute humidity in winter, the construction dries better and settles properly again? I have already seen a few new buildings where wall tiles have been destroyed by settlement cracks? In the current situation, however, I understand it with the humidity...

: I agree with you that the building should be heated during this season. My only problem is that the heating schedule is shifted by one week. For two weeks now, dehumidifiers have been in the house. Now I should additionally put in electric heaters for the delayed week, and I wonder if I really have to do that since the move-in date doesn't matter to me? Could mold develop as a result?

That the heating-up program is delayed by one week is meaningless considering the current season (it is October). And the screed doesn’t really care either. It is drying out further anyway, completely regardless of the worries its owner is currently subjecting themselves to. And if you move in 7 months later, the screed won’t mind either. The temperature should then be kept at a minimum of +10°C using electric heaters or gas heating (with a secondary heating circuit due to the formation of water during combustion). A one-week delay in moving in October – many a builder would give anything to trade your "problems" for their own ....
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Regards: KlaRa