ᐅ Underfloor Heating – How to Insulate the Supply Lines to the Rooms?

cryptoki schrieb:

. It’s simple thermodynamics

Correct. The problem is that your control requirements, as you’ve described them here, conflict with basic thermodynamics. Rapid controllability requires high temperatures and ideally low mass. A new building is the opposite in both respects, which is why there are critical questions. Because of simple thermodynamics. And because of that, some approaches work, but others simply don’t.

With underfloor heating at low supply temperatures embedded in thick screed, the system’s thermal inertia exceeds the duration of typical control cycles.

Isn’t it more likely that you hardly intend to heat with the underfloor heating anyway, so it doesn’t really matter?

He is not concerned with efficiency at all. He wants comfort. Comfort comes at a cost.
That is why I believe he does not need to worry about the supply lines of the heating circuits. If he plans to control all the heating circuits manually (meaning not relying on thermodynamics but overriding it, even if this is done automatically through controls), he can also throttle the dedicated bedroom heating circuits if needed. And when the fireplace is running, all other heating will be turned off anyway.
Therefore, my recommendation is to insulate the bedroom together with the other rooms rather than relying on the 9mm (0.35 inches) thickness over the supply lines of the “non-room” heating circuits.

@Tolentino summarized it very well. Many thanks. Whether and how I will regulate it later is still open; I now have all the options for that. In any case, according to my current plan, the open-plan area (about 70sqm (750 sq ft)) from wall to wall (during winter tire weather) will be set rather cool. When the tiled stove is heated, the 5 heating circuits in the open-plan area will be turned off. According to our plan, this will already happen at 7 a.m. Then a burn-off takes place, and the room will be warm enough. The underfloor heating thermostats will not see the need to open the heating circuits again based on the temperature. In the afternoon, there will be another burn-off, and the same process repeats. Ideally, the 5 heating circuits in the open-plan area will run at a significantly lower level, with less flow and less heat. The same applies to the fireplace room. Planned as a guest room, second open-plan area, second office, or playroom. So it is our multifunctional room. Actually, it is the nicest room on the upper floor. Here, the room temperature will probably be adjusted to be cooler than in the other rooms. The contact points with the other rooms are also minimal. It is like a kind of flat-roof extension. This means the room is also well thermally separated. Two heating circuits were installed here with a 10cm (4 inch) spacing. This will also become noticeable quickly if needed. The fireplace, however, takes priority.

In fact, the bedroom is also very well separated from the rest of the rooms. A wall made of 17.5cm (7 inch) aerated concrete blocks has been built, which should contribute well to insulation. Soundproofing is less effective. Originally, calcium silicate blocks were planned here, our preferred material for interior walls. Generally, almost all interior walls are 17.5cm (7 inch) thick with cement-lime plaster.

Three heating circuits have now been rerouted in the attic. This looks much better. Three heating circuits still run through the bedroom, which is fine, especially considering the previously very tight space with 12 additional pipes. Whew.