Improve sound insulation of interior walls and ceiling

Hello,

I hope I am in the right subforum, I wasn’t quite sure which category to place this in.

We bought a single-family house, built in 2013, timber frame construction.

Now the following things bother us:

The partition walls are extremely thin-walled, the construction is as follows: GKB 12.5 mm, OSB 12 mm, 6x8 cm KVH with 40 or 60 mm Rockwool insulation (according to documents Sonorock, sometimes only 40 mm was insulated, sometimes 60 mm, for whatever reason), OSB 12 mm, GKB 12.5 mm.

For example, you can hear every slight clearing of the throat, or when someone puts down a cup in the next room, not to mention other noises.

Since we want to renovate anyway, a messier, bigger effort wouldn’t be so bad, the question is only, what benefits us the most?

We could leave the partition walls standing and for example set up an interior wall in front of them made of calcium silicate bricks (the statics would allow this), or remove the partition walls and rebuild them with correspondingly thicker calcium silicate bricks? Or just put another drywall wall in front in the same construction? There is also space available.

Then we also have the ceiling issue, visible beam ceiling, insulation above, screed, floor coverings. This is also extremely thin-walled, we would first start with the simplest things, taking out the laminate, putting in carpet for example.
We would preferably keep the visible beams at least partially, of the 26 cm beam height, about 16 cm could be insulated and Heraklith boards set in front, so that about 6 cm of beam remain visible, or would full insulation and a suspended ceiling make more sense here?

Unfortunately, the planner of the house couldn’t really help me regarding improvements in sound insulation.

As it currently is, it is state of the art and millions have no problem with it. The simplest solution is to screw on a fiberboard (Fermacell), possibly with a thin decoupling layer. Then all connections (electricity, TV, water) can be retained. Replacing the wall is the most complex in terms of structural safety, a false wall simply takes up space. Laminate over carpet does nothing for impact sound. If you really have such high demands, find a company that specializes in acoustics and has demonstrably done something like this before (schools, concert halls).

We bought a single-family house, built in 2013, timber frame construction. [...] We could leave the partition walls standing and, for example, build an interior wall in front of them with calcium silicate bricks (the statics would allow it), or remove the partition walls and rebuild them with correspondingly thicker calcium silicate bricks? [...] We would prefer to keep at least some of the visible beams; of the 26 cm beam height, 16 cm could be insulated and Heraklith panels placed in front,

Just the idea of calcium silicate bricks in a timber frame panel house is *ROTFL* at its best. Go through the house with a suitable expert – my first choice here would be the "prefabricated house expert" (in SH I probably don't need to recommend colleague Zink from BY) – and have a proper concept drawn up. Just doing as much as possible in the wrong place is nonsense. Like taking a painkiller for a toothache... you notice that yourself, right?

Just the gag with sand-lime brick in a timber frame panel house is *ROTFL* at its best.

Go through the house with an appropriate expert – my first choice here would be the "prefab house expert" (in SH I probably don’t need to recommend colleague Zink from BY) – and have them create a proper plan for you. Just doing as much as possible in the wrong place is nonsense. A plaster cast against toothache ... you notice that yourself, right?

What a nice interaction here, a mirror of society

Moreover, a house made by the carpenter and prefab house construction expert does not make sense to me

I don't believe it makes any sense to double the walls - the loss of space is quite significant, and the effort is relatively high as well. The easiest solution would be to replace the drywall sheathing - as already mentioned, there are special soundproof drywall boards (e.g. Knauf Silentboard) but also other gypsum fiber boards (from 15 mm) that would bring relevant improvements. It would also be conceivable to double the boards accordingly - the loss of space is limited, and the installations can usually be reused without problems.

Both Knauf and especially Rigips have online acoustic calculators that offer you a simulation of sound insulation, e.g. between two rooms. With Rigips you can even compare between partition walls made of wood + sheathing and solid walls.

However, it is possible that the walls are not properly filled, and/or the component separation (e.g. to the screed) is not correctly executed. Checking/correcting this, however, involves considerably more effort.