Poroton (36.5 cm) versus lightweight expanded clay aggregate solid wall (41 cm)

Expanded clay was already available 20 years ago when my parents built their house. It always reminded me of pumice stone when you cut it. The advantage back then was that you could do without EIFS and didn’t have to cover the building envelope with Styrofoam. Clay is also moisture-regulating.

All materials have their pros and cons. That’s why you often don’t end up with monolithic construction. Often good thermal insulation, like with aerated concrete, means poor sound insulation. Or good sound insulation like with sand-lime brick, on the other hand, means poor thermal insulation. Additionally, there are requirements for moisture regulation and summer heat protection.

I chose a two-shell masonry with 24 cm Poroton blocks and a ventilated brick facade with insulation. Solid inside and out and insulating in between. The wall is almost 50 cm thick.

Well, if I knew that ... no one tells you ... we've asked so many architects, shell builders ... he himself built unfilled ... our whole street builds unfilled with 36.5 ... everyone you ask thinks what they built is the coolest what he built ... I would say the sound comes in where the weak point is and that is the window in this example

If there are no restrictions regarding money and space, how should it be built for maximum sound insulation? 24 cm calcium silicate blocks + 40 cm aerated concrete as thermal insulation? and then sound insulation class 6 windows?

I would say the sound comes in where the weak point is and that is the window in this example

Airborne sound insulation only works with mass. The sound stays outside and does not come in. This is known from solid walls. Airborne sound can only be destroyed by porous surfaces where the sound dissipates. This is known from recording studios. Structure-borne sound insulation only works through component separation, such as the decoupling of pipes or wooden ceilings. It can be true that windows with poor sound insulation are a weak point and reduce the overall soundproofing. However, the sound insulation of solid walls is certainly not nullified as if the entire house were made of glass.

If there are no restrictions regarding money and space, how would you have to build it for maximum sound insulation? 24cm KSS + 40cm aerated concrete as thermal insulation? and then sound insulation class 6 windows?

If sound insulation is priority 1 because you live near the airport or the highway, KSS is certainly not a bad base. Before that, an insulated brick wall. Mixing KSS and aerated concrete would be unusual.

Someone once wrote or said White on White (regarding the stones) probably works... But that was more about aerated concrete outside and KSS inside (because of children's noise)