Screed in summer - Functional heating

I'm currently at the construction site. The picture shows the temperature and humidity after 8 hours without ventilation :eek:

That is about 90% humidity at 28 degrees. So a very muggy day. Nothing special. You have about 24.8 grams of water in the air. A muggy day in the south at 30 degrees and 70% rel. humidity already has 21.3 grams of water in the air. With the values you mentioned, a tremendous amount of water has already come out of the screed.

I assume that your house is not yet insulated or never was. That could explain the difference compared to the neighbors. With Ytong, the stone is the insulation, the prefabricated house has the insulation in the walls.

I assume that your house is not insulated yet or was not. That could explain the difference compared to the neighbors. With Ytong, the stone is the insulation, the prefabricated house has the insulation in the walls.

Yes, it is already insulated. We are building with the filled Poroton brick MZ70 - so no additional insulation is applied to the facade. By the way...the screed heating program is finished. The screed has cracked in two places - about 1 meter long but thin hairline cracks. These were treated with resin yesterday by the screed installer. He said that cracks often occur and this should not be too serious. Hopefully... Regarding our electricity costs: As mentioned above, our photovoltaic system is already running and heating was done with the air-water heat pump max flow temperature - 55⁰C!!! Bidirectional meter, reading before heating - 65kWh Reading on the last day of the program - 307kWh Consumption: 242kWh!!! The pump worked on average with a COP value of 4.6, the heating element did not activate (due to the high outside temperatures). During the heating period, the photovoltaic system fed an additional 415kWh into the grid - it was almost a whole week of constant rain. I am very satisfied with these values.