Soundproofing aerated concrete vs. Poroton

I'm currently researching. And yes, I know the topic is overdone. I also understand that the processing, the windows, roller shutter boxes, etc. play a role. And yes, if you want proper soundproofing, you should prefer other options (Kalksandstein, etc.)

I'm assuming a monolithic construction method. I'm more concerned about a surprising finding. When you use search engines and read through forums, the consensus is very clear. Poroton has a higher bulk density than aerated concrete, therefore obviously better sound insulation with Poroton. So far so good. Logically first.

Now I looked into the data sheets of two stones with the same lambda value (0.08). Both well-known manufacturers. The Poroton filled with mineral wool.

And lo and behold, both have comparable sound insulation values between 46 and 47 dB.

Now I'm confused. Can someone explain this to me?

Since sound insulation is ultimately a highly subjective perception of different frequencies, it cannot be meaningfully represented in a single measurement or material property value.

If sound insulation is a major issue for you ([railway line, highway, airport ...]), then it is worth the effort to research more thoroughly here, to listen/feel in model home parks, etc. For normal residential areas, no one can convince me that you would hear anything through, for example, a 36 cm Ytong wall.

Big is a relative subject. A noise protection report was made for our construction area. We are getting a noise protection wall. The municipality was quite annoyed. In short, because at night the noise level in the first floor is exceeded by a minimal value due to the combination of various factors, including a previously only planned and not implemented road, we now have to provide a calculated noise protection certificate. We are relatively favorably located within the area, so I don’t worry much about not being able to sleep at night. However, since I am still undecided between Poroton or aerated concrete, this would of course have been an argument one way or the other if there were significant differences. That was my initial impression, after skimming through the WWW. Therefore, I was a bit surprised. I understand that these are only calculated values and many factors play a role. My gut leans towards aerated concrete and has now been shaken by the noise protection issue.

Ok, so the problem is real. Then probably neither the subjective experiences here in the forum nor the specifications in the glossy brochures will help you. Who prepares the soundproofing certificate? Architect? Maybe he would be so kind as to prepare it with both building materials. Both variants will meet the requirements, but you would have a solid, objective comparison and could then decide.

Real in the sense of I need proof - yes.

That will be done for us by the structural engineer/engineering firm. I will get it in the next few days. And yes, he will give us an invoice for both stones.

At first glance, he said he doesn’t see any major difficulties, but of course, he can only say for sure after the calculation.

Since the peak noise level at night is only minimally exceeded and that only with an overlay of all factors, I am not panicking now either.