>the solid to air transmission after is extremely poor. >Otherwise you'd be telling me that if I suddenly put a concrete wall between us I should hear you better, not worse, right? /s

What if I put 2 sheets of dry wall with an air core in between us? Are you telling me that would give better sound transmission than a solid concrete wall?

No, but it's not the air that's deadening - it's the drywall, because just like with concrete, you need to transfer the energy of the sound from the air into the drywall, then air, then drywall, then air again. It's the change between mediums that provides insulation here, in addition to the vibration damping properties of drywall. In fact if you already have concrete walls and want to add sound insulation in your house, the easiest solution and most common solution is to cover them in drywall.

So can we agree, houses built with 2 layers of dry wall and an air core will have more sound deadening than a house built with concrete walls?

And that the original posters tale of "superior sound insulation" in a house with concrete walls is likely due to factors other than the concrete walls?

All I said was that my mum has a house made entirely of concrete and the noise insulation in that house is insane, you can't hear a single thing from room to room. I'm not a structural engineer however and I have no idea why that is.

Oh. Ok. So you have 2 facts sitting right next to each other that are completely unrelated. One about the construction of a building. The other about sound transmission withing the house. I understand. I was under the impression that you were trying to suggest that one fact implied the other. Forgive me