Sound-transmitting multi-family house, how to renovate the intermediate ceiling?

Great, thanks... Last night it even occurred to me (of course also because of the order size and adjustment of the door frames) that one could also suspend the ceilings from below and fill them with sound-absorbing material. I would easily have 20cm there, and that would certainly absorb quite a bit of noise. What would be good as a filling in terms of acoustics?

Yes, and unfortunately I have to do everything myself because the purchase price has unfortunately taken away all my financial freedom...

Again: As long as nothing is known about the problem and its cause, no reliable solutions can be presented. A [Unterdecke] can improve the situation, but it can also have no effect or even worsen the whole thing. Planning and execution of the countermeasure depend on the problem (airborne noise or impact noise) and the structural conditions of the existing building. Without this minimum information, no one will be able to offer you a reliable solution proposal. And if you want to play Russian Roulette and just implement any measure (within your almost unrealistically limited means), the probability that your investment will not bring any building acoustic added value is very, very high.

Thank you, I fully understand. Once the notary and everything else is done, I will of course first examine the rooms carefully in this regard, or let some children play upstairs... :eek: But regardless of the result, you can't remove the intermediate beams, I therefore also think that if the floorboards are nailed 1:1 onto the beams and the beams are ultimately transferred to the walls, I will focus my work on installing a thin and high-quality impact sound insulation between the floorboards and beams. However, the floorboards at the edge should no longer be embedded in the plaster/wall but have a 1cm gap ... That would probably reduce the sound best before it can spread at all...o_O It is an old village house, located far away, tenants can only be found here with very low rent... it's just a difficult situation to have service businesses operate without a solid prospect of good and secure rental income...

well. If the floor is firmly connected to the masonry, it could be a sound issue. However, I am surprised in that regard that there are no expansion joints and presumably you also have solid wood planks?

For soundproofing hard-soft-hard, the soft material should be as soft and heavy as possible.
For drywall partitions, mineral wool is generally used for this purpose. However, I believe 6cm or so is standard. Less than that is already little, rather too little.

Now, I think there are heavy soft mats for the floor. They would probably absorb the most.
It is then a different material than that 2mm plastic stuff that is typically slapped under laminate.

A cement screed, as far as I know, is poured on the insulation mats. However, there is a foil between the cement and mineral wool that prevents a connection.
But I am not certain about that.

I think, in any case, a cement screed on your ceiling with wooden beams won’t work because it is too heavy.
I also doubt that it would/will bring that much benefit. I wouldn’t undertake that project.

There is a dedicated forum for houses as old and even older than yours, by the way. Quite capable people with experience take care of various problems there and offer assistance.
In that forum, you will certainly get much better help.

Since I don’t know if linking is allowed.
Type into google - [fachwerk forum]

Overall, you still don’t know whether there is such a big problem at all or if it was just very sensitive tenants...

When the notary and everything else is done, I will of course first examine the rooms thoroughly in that regard

For my taste, a bit too much "if" and "then". Buying a pig in a poke?

to insert a thin and high-quality impact sound insulation between the floorboards and beams.

What does your "thin and high-quality" impact sound insulation look like? Insertion insulation thickness? Dynamic stiffness? Maximum permissible surface pressure? And how is the (structural) sound bridge-free connection of the floorboards to the beams achieved then? Surely not floating?

stupid constellation to allow service companies to work

The stupid constellation is another one. Nobody is talking about a service, but about a consulting service. You can then incorporate the result yourself. But since you have shown absolute resistance to advice until now, this is the end for me. Soundproofing in old buildings is and remains nothing for amateurs.

The offered..."Beratungsleistung vor Ort"... is, in my opinion, a service and I was initially just looking for some discussion and possibly experience here in the forum. If that doesn’t seem possible, then what is this forum for?

I already mentioned, it is a house out in the countryside, not a government building. Therefore, no premium soundproofing needs to be applied and I am not tearing down any walls or ceiling beams. So if I cannot install screed due to the height and do not want or need to change the door frame height either, then ultimately only 1-2 logical applications remain... If in the end it perhaps only brings 10-20% improvement, then so be it and that’s that. Nothing more will be done.

So why can’t the remaining solution paths be openly discussed here? Is raising and slightly underpinning the wooden floor that stupid? With what other idea can I get a significantly better result in impact sound insulation?