ᐅ Which impact sound insulation is suitable for underfloor heating?

Thanks for the explanation!

Best regards,
Sabine

I have already mentioned this in another thread:
The heat stays inside the house; there are no losses—regardless of the type of impact sound insulation installed.
UNDER the parquet flooring, there is definitely a much thicker layer of insulation. Before the heat escapes, it passes through the thickest impact sound insulation multiple times. In the upper floor, it doesn’t really matter anyway, since the heat can only move down to the ground floor at most.
Therefore, I would bet that you won’t notice any difference in heating costs from using different types of impact sound insulation (even if glued or floating).

Deliverer schrieb:
The heat stays inside the house; there are no losses

To maintain a constant heat flow from the heating pipes into the room, the resistance of the floor structure must be overcome. If the resistance is high, the driving temperature difference must compensate and become greater. This means that the heat in kW remains the same, as you said, but the heating supply temperature has to be higher. Depending on the system, this can be noticeable (less so with gas, more so with heat pumps). It may be marginal (domestic hot water also plays a role), but the effect is greater than zero.

Deliverer schrieb:
The heat stays inside the house, there are no losses – regardless of what kind of impact sound insulation is installed.

Hello, that is physically incorrect. Energy is indeed conserved in some form (law of conservation of energy in thermodynamics), but that’s not really the point here.

Following your argument, external wall insulation would not make any difference either. If that were true, you would only need to heat your living room once (and even a simple tealight would be enough...), and you would enjoy a cozy warmth throughout the winter, since nothing is lost?

Deliverer schrieb:
Therefore, I bet you wouldn’t notice any difference in heating bills with different types of impact sound insulation (even if glued or floating).

Of course there is a difference! For example:

You put a pot of water on a stove (which corresponds to our glued installation) to bring the water to a boil. This requires a certain amount of energy.
If your statement were true, you could now place a trivet (which corresponds to our underlay) between the stove and the pot. Would the water still boil with the same energy input? I don’t think so...

wieli schrieb:
Following your argument, external wall insulation wouldn’t help either.

No. That’s not a correct interpretation of my argument (very thick insulation on one side, very thin on the other).

wieli schrieb:
Of course, there is a difference!

Yes. But as I said, it’s barely measurable.

wieli schrieb:
For example:
You place a pot of water on the stove (equivalent to our adhesive) to bring the water to a boil. This requires a certain amount of energy.
If your statement were true, you could do the following at the stove: put a trivet (equivalent to our underlayment) between the hotplate and the pot! Would the water continue boiling with the same energy input? I don’t think so...

If it is ensured that heat cannot escape anywhere else, what other choice does the water have?

Deliverer schrieb:
If it is ensured that the heat can’t go anywhere else, what else can the water do?

Let’s imagine the hotplate is heated by water flowing through it. The water enters the hotplate at a supply temperature and leaves at a return temperature. The difference (multiplied by the mass flow rate and the specific heat capacity) equals the transferred energy. Using a trivet as an insulator between the hotplate and the pot would cause the return temperature to be higher, and the energy supplied would decrease. As a result, the water at the top of the pot would no longer boil. Countermeasure: increase the supply temperature.