Building drying: Is it better to turn off the controlled residential ventilation system in summer?

I cannot imagine that this will bring any benefit. A controlled residential ventilation system also does not extract moisture from the substance, but from the air - a construction dryer has a completely different performance, in my opinion

In short, regards

Our screed is currently drying. It is walkable but not yet coverable. Our [Kontrollierte-Wohnraumlüftung] is not running! Our underfloor heating is heating, nothing more. The site manager explained to us that we should ventilate manually twice a day. Open everything in the basement on the east side, in the upper floor on the west side. Always for 15 minutes. The warm air in the house can absorb more moisture than cold air. That is the background.

I thought the controlled residential ventilation system should only be switched on after the building drying, because of dirt and initially continuously humid air in the system... this was already discussed somewhere.

correct. the system is only put into operation later. during the shell construction phase, there is simply too much dirt in circulation. the system/pipes would just get unnecessarily dirty. you would certainly need some filters on the main unit. besides, the airflow of the controlled residential ventilation system is simply too low for building drying. i'd leave it and just tilt open a window on the upper floor. that provides more airflow and is cheaper :)

I’d leave it and just tilt a window on the upper floor. It brings more airflow and is cheaper :)

Hello, with the current weather (daytime >20°C and at least 80% humidity), that makes no sense at all. The installed drying dehumidifiers are dehumidifying the incoming outside air.

Best regards, Barossi

If you use dehumidifiers and the humidity is already as low as you wrote in the other thread, further measures to dehumidify will not help. You have already minimized the vapor pressure in the room air. The drying of the screed (or other materials) is based on the vapor pressure gradient. You can only accelerate the drying by increasing the vapor pressure in the screed, i.e., by heating.

Circulation, e.g., with fans, may help if the humidity varies greatly from room to room.

Hello,
yes, I think so too. I have installed 3 large dehumidifiers, turned all heaters up to the maximum, and the windows are closed.

The place is hardly bearable: 34°C and just under 30% humidity in most rooms. I have to empty the containers almost 3 times a day. Fans will be set up next week, I had read that these help a bit more.

Do they have to blow the air over the screed towards the dehumidifiers?

When the temperatures drop below 10°C outside again with normal humidity (at least below 80%), I will ventilate briefly again.
The plumber will be at the house again next week, we’ll see, he will complain because it’s way too hot to work!

Best regards, Barossi