Floating installation for underfloor heating due to low pollutant emissions?

Hello,

We will soon be taking over our house, which is currently under construction.

We will have underfloor heating in connection with a geothermal heat pump. From what I have understood so far from reading posts, it is recommended to glue the parquet flooring due to the low flow temperatures of the underfloor heating to achieve better thermal conductivity. I am considering installing the flooring floating instead, as I would like to avoid a source of emissions from more or less healthy substances (there is apparently no adhesive free from harmful substances). Haro, for example, has an ökoline impact sound insulation that appeals to me in terms of type.

Now to my question, since I am not particularly knowledgeable in thermodynamics: Once the impact sound insulation is warmed through, is there still a difference compared to glued installation (with this type of underfloor heating, the temperature is regulated relatively little and rather maintained at a constant level) – or is the insulating effect permanent and more heat energy is unnecessarily conducted in the other direction (i.e., the base slab)?

Thanks in advance for your experiences / opinions.

Hello. We were told that the underfloor heating takes a bit longer to warm up, but after that it heats just as well as with glued parquet. My sister, for example, also has floating laid parquet and it is nicely warm in winter. However, we have no personal experience as we are just in the process of getting quotes. At the moment, we are leaning towards floating installation.

That it takes "a bit" longer I consider a rumor...maybe at high supply temperatures...but not with a low-temperature underfloor heating as is usually installed in houses nowadays...

Our glued parquet, for example, is always definitely cooler than the tiles next to it...if it were installed as floating...then it probably wouldn’t get warm anymore...

In my sister's new building (2 years old), it was installed as a floating floor and it is pleasantly warm underfoot. It is well known that parquet does not get as warm as tiles during the heating period. Maybe someone who installed floating floors in a new building can share their experience.

Hello, thank you very much for the answers. I suspect that the parquet industry has further developed its products for the increasingly widespread low-temperature underfloor heating. I have now asked our heating/plumbing installer which floor coverings (or thermal resistance values) he used for the design calculation. For some parquet manufacturers, the figures for thermal resistance are presented very clearly (e.g. Haro), and in some cases, the sum of impact sound insulation and parquet is lower than for, for example, rather thicker parquet. However, it almost always remains below the maximum recommended 0.15 m2 K/W. I need to think about this again and also ask several installation companies as part of the tender.

If the thermal resistance is higher, the heat flow (amount of heat transferred per time) is reduced. This means that less thermal energy reaches the room. Thus, the temperature difference between the supply temperature and the room temperature increases.

Of course, this depends on many factors (building envelope, supply temperature, surface of the heating circuit, etc.).

If the heat flow from the heating system to the room air were ideal (or the insulation of the building envelope), the temperature of the heating circuit would be equal to the room temperature. The greater the resistance here, the higher the temperature difference.

Whether this plays a role in practice is another matter. I think if you stick to the guideline values (max 0.15 m²K/W), it is fine. I generally only doubt the information from manufacturers.