Soundproofing in old buildings - decoupled facing shell with expanded clay?

  • Erstellt am 2023-12-21 11:52:33

EddySky

2023-12-21 11:52:33
  • #1
Hello everyone. I am trying to get a sound problem under control and am uncertain about basic issues regarding a decoupled facing shell, or I hope for constructive feedback from people with experience.

The following problem: My direct neighbor is loud and does not want to change that. Among other things, he has a staircase that is attached directly to the shared wall. Since this wall is extremely thin (max 15 cm, basically more like an interior wall between rooms, old building in a Spanish village), the sound from his stomping on the stairs transmits directly into my bedroom. If you put your hand on the wall, you can even clearly feel the vibration. It is really quite intense.

I now want to equip parts of the wall on my side with a soundproof facing shell. Even though the problem would never completely go away because of this, I hope to at least reduce the peak by doing so.

It is always said that only mass helps with structure-borne sound. And indeed, I once had very good experiences with a boxed-in drain pipe filled with expanded clay (which is available here). That is why I am also leaning toward expanded clay as sound insulation for the wall.

So my current plan is as follows: decoupled facing shell, double-layered with appropriate sound protection boards, filling the cavity with the finest possible expanded clay (up to 5 mm). Unfortunately, due to space constraints, the cavity cannot be deeper than 5–7 cm.

Am I making any conceptual mistakes? Aside from details – would this be the right approach?

I would have liked to hire a specialist for this, but in my area there is a) no one with experience in decoupled drywall construction and b) it is otherwise a small project for which no one has time. So I have no choice but to do it myself. Also, I am limited in the choice of building materials because not everything is available, or some things would have to be expensive and complicatedly transported by freight.

Thanks already for your answers.
 

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