Unfilled bricks and soundproofing - looking for experiences

We have these bricks and I would definitely use sand-lime bricks for the interior walls next time and fill the exterior bricks .... e.g. with mineral wool ... but it depends on how sensitive you are and it also costs money, just for filled exterior bricks our general contractor wanted 7000 euros ... so TV really isn't a problem, not even with a home cinema. And especially nothing transfers through the exterior wall ..... but you'll hear the teenager's music ... if you decide on normal interior bricks then be especially careful with the bathrooms that the walls are thick enough and if possible the pipes from the toilet etc. are not adjacent to the children's room or similar ... otherwise you'll wake the little one ... With a 24 cm wall and insulated pipes, but no problem even with bricks ... The important thing is the overall concept ... then CPL doors for inside or windows with poor sound insulation then you haven't gained anything either .... everything has to fit together

We have 11.5 cm bricks between the bathroom and bedroom + plaster on each side. The sink is adjacent to the wall. Unfortunately, you can hear everything in the next room. Is it possible to reinforce the wall again from each side with drywall to reduce the sound?

This was about something similar... Only a few days old

As some have already said, sound insulation is truly not a strength of these bricks. Concrete experiences with Unipor U08 36.5cm hollow plan bricks unfilled as an exterior wall:

- Sound insulation to the outside is lousy. We live quietly and have rather poorly sound-insulating windows, so the exterior wall does not weigh too heavily. But in one room there is no window facing the neighbors, and if someone outside is talking a bit louder about 5 meters from the house, you can hear every word inside. Definitely through the wall. And some frequencies, like from a drill, pass through the wall with very, very low attenuation. If you live quietly, this can be completely irrelevant. On a busy street or similar, however, these bricks would be a big mistake.
- Sound insulation between floors is practically perfect thanks to the reinforced concrete ceiling and good decoupling. You have to go to the stairs to call upstairs.
- Sound insulation between rooms is okay. Not perfect, but significantly more sound passes through our hollow core doors than through the 12.5cm walls. Walls where this matters should, however, get the 17cm or 24cm interior bricks.
- As others have written: We paid a lot of attention to sound insulation in the floor plan. No children's room or bathroom next to the bedroom. Generally, no wall containing water pipes next to a room that requires quiet. No bathroom or toilet next to the office. And an (almost always open) glass door from the hallway to the living room instead of an open floor plan. A concrete staircase so that I, as a clumsy person, do not wake the entire house at night. Last but not least, an L-shaped staircase that separates the ground floor well from the attic floor in terms of sound.

Would I use the bricks again? Since I did not want ETICS and was not convinced by filling, there were almost only the hollow ones left. In that respect, yes, I would do it that way again.

- Interior insulation between the floors is practically perfect thanks to the reinforced concrete ceiling and good decoupling. You have to go to the stairs to be able to call upstairs.

That surprises me a lot. Because the sound in the upper floor hits the wall and then reaches the neighboring rooms through the brick. Also from the upper floor to the ground floor. The reinforced concrete ceiling must be interrupted due to a thermal bridge. Nowadays, you usually have a half-brick with wool and concrete there. The sound goes through the wool. So the longitudinal sound in the house bothers me just as much with the bricks. That’s why it is also prohibited in multi-family houses, and there are also floor ceilings for that :).

So then something probably wasn't done completely cleanly on your side. Or in your permafrost climate, there is permanently an ice layer on the outside of the bricks that ensures the coupling ;-)

As I said, from inside to outside really bad, barely okay to the neighboring room, best sound insulation to the room above on the next floor.

Or with you, it was simply concreted through :D.