Solid house: Which stone? Poroton, Liapor / expanded clay, Ytong?

Hello,

And I am a natural scientist ...

I expected nothing else In which field, if I may ask?

But a stupid question: What about non-load-bearing interior walls? You can decouple them, right.

There are no stupid questions It has been a regulation for quite some time now to include not only the properties of the individual component but also the acoustic properties of the respective component in the calculations. They are called decoupling and something profiles, if I remember correctly.

And theoretically, lightweight walls are also mixed masonry, right.

I wouldn’t see it that way, not even theoretically ... but I am only a merchant and saleswoman

Which in my layman’s view is anyway the most consistent construction method (ideally combined with a ventilated curtain façade, of course not exactly cheap), since you can best avoid thermal bridges that way.

That’s a rather outdated view; still a matter of taste. There is no such thing as "THE" brick which can be used as the one and only solution. And for lovers of monolithic plaster façades, your favorite is absolutely a no-go anyway.

Or at least you should build inside with Poroton using plan bricks RDK 1.4 or directly soundproof bricks RDK 2, and also not save on load-bearing walls ...

Too bad I won’t be at your consultation talks; your saleswoman will certainly have a lot of fun with you

Not for the exterior masonry at least in a quiet residential area.

Up to sound insulation class 3 usually no problem; after that, a structural engineer has to calculate anyway.

A stupid question I don’t quite understand: Why do people always only talk about mass in sound insulation?

I copied for simplicity; I think it is explained in a way somewhat suitable for laymen:

**The weighted sound reduction index R`w of a single-leaf component, whether a panel, a ceiling, or a wall, depends on the surface-related mass. The heavier the wall, the greater the sound insulation. The prerequisite is the tightness of the wall: no air gaps and no large cavities. The type of material plays only a conditional role, and the influence of stiffness is relatively low. The sound insulation index R` of walls and ceilings usually increases with frequency.

The influence of small cavities is largely insignificant. However, offset perforations in bricks have an unfavorable effect because they make the brick “softer.” Large cavities lead to resonances of the individual shell elements, reducing sound insulation. The dimension can only be determined by measurement.

For thick exterior walls with low density (low modulus of elasticity, low density), thickness resonances can lead to a reduction in sound insulation. The arrangement of perforations has a special effect on thickness resonances: walls made of offset perforated bricks lose stiffness compared to those with continuous webs, reducing sound insulation by about 10%.

The weighted sound reduction index R`w of plastered walls on both sides depends on the raw density class of the brick and the wall thickness:

[*]Hollow concrete blocks (RDK 0.8): wall thickness 17.5 cm - 44 dB / wall thickness 24 cm - 46 dB
[*]High perforated bricks (RDK 1.2): wall thickness 17.5 - 45 dB / wall thickness 24 cm - 48 dB
[*]Concrete (RDK 1.4): wall thickness 17.5 cm - 48 dB / wall thickness 24 cm - 52 dB
[*]Calcium silicate brick (RDK 1.8): wall thickness 17.5 cm - 51 dB / wall thickness 24 cm - 54 dB

The four chosen brick types would, of course, show varying sound values in other density classes. Plasters have a great influence on sound insulation in any case. They close joints and increase the stiffness of “soft” perforated bricks. Even one-sided plaster can effectively compensate for leaks in masonry.

A special effect is material damping, the conversion of structural-borne sound vibration energy of the wall into heat. For walls made of lightweight concrete, especially aerated concrete, better sound insulation has been measured on the test bench and on site than expected according to weight curve. The causes are the damping of the material itself and the enhanced dissipation of sound pressure into other components.

**Sources: DIN 4109 Sound insulation in building construction: requirements as well as Achtziger, Joachim; Pfeifer, Günther; Ramcke, Rolf; Zilch, Konrad, Mauerwerksatlas, Birkhäuser, Basel Boston Berlin 2007


I couldn’t quickly find calculations for 36.5 cm masonry, but the results should be even better.


Rhenish regards

Our developer managed to meet the sound insulation requirements for a house near the airport using Ytongg stones. Of course, the windows also played an important role in this. I keep noticing that many do not consider that Ytongg walls are walls too.