Brick (Poroton) or sand-lime stone 17.5 cm WDVS - sound insulation

Hello house construction forum,

which option is the "better" one or can you really notice a difference in terms of sound insulation?

17.5 cm plan brick T1.0 and 20 cm ETICS or
17.5 cm calcium silicate brick and 20 cm ETICS?

The single-family house (1.5 stories) is supposed to be KfW 70, about 150 sqm and with triple glazing, etc. Actually a quiet residential area in a dead-end street (4-lane street about 1 km away, you only hear a background noise there).

Although KS is supposed to have better sound insulation, will I notice this as a homeowner (because of windows and roller shutter boxes) or is it just "theoretical"? I was a bit unsettled by posts saying that bricks are so echo-prone and you can have conversations through the exterior wall. Or am I just imagining a "luxury problem" here because I want to build in a quiet residential area anyway and I hardly hear anything from the neighbors? Or does more noise come through the windows and roller shutter boxes anyway than through the wall?

I know it is hard to judge something like this from afar and everyone perceives it differently, but I have some concerns with the brick option regarding sound from/to outside and it seems a bit thin to me and if sockets etc. are also supposed to go into the wall... (but that will of course be calculated/regulated by the structural engineer).
Also, it makes me a bit suspicious that the manufacturer recommends this plan brick "for load-bearing and non-load-bearing interior walls without special sound insulation requirements" and now it is supposed to be used as an exterior wall with ETICS.

Both suppliers are similarly priced, but I would somehow prefer the brickmaker because he is from the neighboring village and the other one is 100 km away.

Many thanks for your advice/tips

Hi,

there is indeed a difference. But if you live in a quiet area and do not have high demands, then you won't have major problems with bricks either. However, sound insulation within the house must also be taken into account.

I always prefer [Kalksandstein]. It has its advantages in sound insulation, structural stability, and summer heat protection.

Regards

....
which variant is the "better" one or can you really notice a difference in terms of sound insulation?

Already very positive that here in principle separation of powers in wall construction was considered!
Here KFW 55 is certainly possible without much additional effort!
If you are close to it, you should definitely consider it. Better funding conditions + €2,500.

best regards