Glue two or three layers of plasterboard on plaster/concrete for sound reduction?

[Linus Larsson]

I live in a cooperative apartment that is poorly soundproofed. The building was constructed in the early 1950s and the walls consist of brick + concrete/plaster. I primarily have problems with sound leaking into the living room from one of the neighbors. I don't have a problem with bass sounds; it seems to be higher frequencies. For example, I can clearly hear the sound from the neighbor's TV (I can hear what's being said on the TV if I focus). Speech and coughing are also clearly audible. Interestingly, just having my own TV on at low/normal volume is enough to more or less drown out the sound from the neighbor's TV.

Now, regarding the conditions. Unfortunately, there is only an option to build out the wall in question by about 5 cm due to the door opening to the hallway. So building a freestanding wall that is 5 cm including double drywall feels tight. Therefore, I'm now considering whether it would be possible to reduce the leakage of the frequencies I have problems with by gluing two or three layers of drywall directly onto the existing wall (where the drywall layers are staggered relative to each other).

Does anyone have an opinion on this?

Thanks in advance

 

[jojo123]

Doubtful if it helps, it probably does something, what else is there on the wall, maybe a sound absorber of some kind, they are to prevent the neighbor from hearing you but probably work the other way around too.

 

[vanpire]

But if you have 5 cm, you can set 20 mm thick slats and screw double plasterboard into them. Total of 46 mm. Between the slats, you place Biltema's sound insulation felt. Should have an effect, but it's important to seal all gaps.

 

[prototypen]

I think you should start looking for holes and cracks, a brick wall should be heavy enough that it shouldn't be soundproof.

Protte

 

[vanpire]

I think you should start looking for holes and cracks; a brick wall should be heavy enough that it shouldn't be noisy.

Protte

I disagree. I live next to an old lady who has her TV on loud late at night. Brick wall in between, and it doesn't help.