Delayed heating program screed drying problematic?

Hello everyone,

actually, the heating program for drying the screed was supposed to start on Wednesday. Since the electrician has not yet installed the meter cabinet and the meter, the air-water heat pump cannot be put into operation. Stiebel Eltron does not accept connection to the construction site power box. Because of this, the drying program is postponed by about one week. My builder told me that I absolutely have to set up electric heaters to bridge the time so that the building is heated. Every day without heating is harmful to the building, he said. Furthermore, he said that the screed is drying from above and the moisture from the lower layers cannot escape upwards. Two architect friends told me that I don’t need these devices or that the delay is not that bad. Except that I will just be able to move in a week later. Which is not a problem for me at all. Oh, and for two weeks I have been running drying machines, which also generate a little heat.

Can the delay lead to any problems later on (mold, bad for the screed, etc.)?

It would be nice to hear your opinions. Thank you and best regards

Just an opinion: The architects are right, the BU is talking nonsense. One screed dries down to value X in three weeks, another only needs two weeks, and the third four weeks. Or in other words: If these three weeks after installation were due to a certain drying level, then the moisture level would have to be measured on every screed before heating. Therefore my conclusion: whether 21, 25, or 28 days, it probably doesn't matter. If I am completely wrong about this, I would appreciate an explanation – preferably a technical one.

So, why the screed gets damaged when heating is not applied is beyond me. Screed already existed in 1920, and back then houses had stoves and during the construction phase nobody heated. The architects are right, your BU is not. Karsten

Well, he told me that the screed upstairs is becoming too dry and thus the moisture can no longer escape from the lower layers of the screed.

What if you built with radiators instead of underfloor heating?

Then his screed would be lower and he wouldn't have heated screed either. Stupid comparison. Just like the one with 1920. can you help?