Which construction company builds with Poroton? (NRW) Thanks for the info

Good evening :-)!

We are relatively at the beginning of our house planning and are currently at the point that building the exterior walls with Poroton (36.5 cm) is best for our house.
We will be building relatively close to a fairly busy road and there is also a railway line in the immediate vicinity - so the sound insulation value is our top priority. (Energy efficiency is now the same for all houses being built anyway).
From our research so far, we have found that Poroton exterior walls are apparently (?) the best for good sound insulation. We are also happy to receive other opinions or confirmation here.

So far we find hardly any house-building companies that build with Poroton. Can anyone recommend a good company for NRW (Rheinisch Bergischer Kreis)?
We are very grateful for your help.
I guess you can tell from my post - we are complete beginners and very open to any comments/help.

Thank you very much :)

If soundproofing is so important, I would rather look for sand-lime brick with [WDVS] or even a cavity wall construction.

(Energy-efficient are now anyway all houses that are built nowadays).
According to previous research, we have found that Poroton exterior walls - apparently (?) - are the best for a good sound insulation value. We are also happy about other opinions or confirmation here.

You achieve sound insulation through mass. A porous stone does not provide that. Sand-lime brick is your friend.
But the wall is not everything. Glass, roller shutter boxes, etc. also have to be right. So don’t put all your effort only into the wall.
Poroton, at least in the high-end (filled, perlite, etc.), is rarer in our latitudes; with sand-lime brick you have better luck in NRW.

Thank you for the help, we have meanwhile found quite good providers and have also decided to focus on soundproof windows.

I would also recommend [Kalksandstein] and [Schallschutzfenster] to you.