Aerated concrete 42.5 lambda 0.08 or 0.09

That means you are in favor of aerated concrete for the exterior wall and sand-lime brick inside?

My mistake, confusing terminology. It is an unfilled hollow brick that the local brickworks calls Klimatherm PL8. Thermal conductivity 0.08.
That would be the Schlagmann Poroton Planziegel-U8, I assume they are identical.

Many greetings! mini

Aerated concrete is even worse than Poroton. It is just air! Either sand-lime brick with ETICS or my choice would be a filled brick, preferably with perlite or alternatively with mineral wool.

With the unfilled bricks you have massive longitudinal sound transmission in the house, that is really severe. That is why this brick is "forbidden" in apartment buildings according to the state of the art. But even in single-family houses you get all the noise.

Aerated concrete is even worse than Poroton. ... my choice would be a filled brick, preferably with perlite, alternatively with mineral wool.

Poroton is the name of the brick that is filled with perlite, right? Am I mixing something up here or are you?

With the unfilled bricks you have massive longitudinal sound inside the house, that is really intense. That’s why this brick is "forbidden" in multi-family houses according to the state of the art. But even in single-family houses you get exposed to everything.

Longitudinal sound – meaning you wouldn’t use unfilled bricks anymore (whether with perlite or mineral wool). Okay.

With unfilled bricks, you have massive longitudinal sound inside the house, which is really extreme. That is why this type of brick is "forbidden" in multi-family houses according to the state of the art. But even in single-family houses, you get all the sound.

Aha(?), about 2 years ago a pretty large multi-family house complex was built here with an unfilled 42 cm T9. I can only repeat that something must have gone wrong if you have sound problems with Poroton. In a single-family house, most sound probably comes through the door gap and keyhole... if you even have doors at all, or if they are closed at all.

Aha(?), about 2 years ago a pretty large multi-family house complex was built here with an unfilled 42 T9. I can only repeat that something simply went wrong if you have sound problems with Poroton. In a single-family house, most of the noise probably comes through the door gap and keyhole... if you even have doors, or if they should still be closed.

Then I feel sorry for the people. An unfilled brick is a taboo in multi-family houses. It should be clear to every technician, the bricks are hollow inside and are mostly glued. What happens with sound in the longitudinal direction? It can pass unhindered and is even amplified by resonance. Unfortunately, this has nothing to do with something going wrong, it is simple physics. Why do you think filled bricks were developed? Thermal insulation is not (much) better than unfilled. It is only about sound.

An unfilled brick is a taboo in a multi-family house

An unfilled brick is like an unfulfilled life. Joking aside, isn’t it the case with all other building materials that everything is connected? With KS, do the bricks float? Air doesn’t pass through unrestricted either, there's the adhesive in between, and usually a ceiling between floors.
By the way, aerated concrete blocks are solid and acoustically much worse than the airy Poroton bricks.

You are dissatisfied with your Poroton brick, but your statements are not universally valid.
The filled Poroton bricks were developed under the aspect that the unfilled ones from T8 upwards resemble more a butter biscuit than a stone; the webs in the filled ones are simply much more stable.

All building materials have their pros and cons. If one had such a poor property as you propagate here, people would only build with KS or concrete.

For the structural construction, there are specially the S8-S10 Poroton bricks. They are always filled and have thicker webs to meet static requirements.