ᐅ Floating installation with underfloor heating due to low pollutant emissions?

Hello,

We will soon be moving into our house, which is currently under construction.

We will have underfloor heating combined with a ground source heat pump. From my reading so far, I understand that due to the low supply temperatures of the underfloor heating, it is recommended to glue the parquet flooring for better thermal conductivity. I am considering installing it as a floating floor instead, as I would prefer to avoid a source of emissions from more or less healthy substances (there apparently is no completely non-toxic adhesive). For example, Haro offers an impact sound insulation underlay called Ökoline, which seems suitable to me.

Now to my question, as I am not very knowledgeable in thermodynamics: Once the impact sound insulation underlay has warmed up, is there still a difference compared to glued installation (with this type of underfloor heating there is usually little regulation and a rather constant temperature is maintained) — or does the insulation effect remain constant and more heat energy is unnecessarily transferred in the other direction (i.e., to the floor slab)?

Thank you in advance for your experience and opinions.

Hello.
We were told that underfloor heating takes a little longer to warm up, but after that it heats just as well as with glued-down parquet.
For example, my sister also has floating parquet flooring, and it stays nicely warm in winter. However, we don’t have personal experience yet, as we are just starting to gather quotes.
At the moment, we are leaning towards the floating installation.

I consider the idea that it takes "a bit" longer to be a myth... maybe with high supply temperatures... but not with a low-temperature underfloor heating system, which is usually installed in houses nowadays.

For example, our glued parquet is always definitely cooler than the tiles next to it... if it were installed as a floating floor, it probably wouldn’t warm up much at all...

In my sister’s newly built house (2 years old), it was installed as a floating floor and feels pleasantly warm underfoot. It is well known that parquet does not get as warm as tiles during the heating season. Maybe someone else who has installed floating flooring in a new build can share their experience.

Hello, thank you very much for the replies.
I assume that the hardwood flooring industry has further developed their products for the increasingly common low-temperature underfloor heating systems. I have now asked our heating/plumbing contractor which floor coverings (or thermal resistance values) they used for the system design. Some hardwood manufacturers present the thermal resistance data quite clearly (e.g., Haro), and in some cases, the combined value for impact sound insulation and the hardwood floor is lower than that of, for example, thicker hardwood flooring. However, the values almost always remain below the maximum recommended 0.15 m²K/W (0.86 ft²·h·°F/Btu).
I need to think this over again and, as part of the tender process, also consult with several installation companies.

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

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

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

Whether this makes a practical difference is another matter. I think that adhering to the recommended values (maximum 0.15 m²K/W) is fine. I just generally doubt the data provided by manufacturers.