Aerated concrete or sand-lime brick with external thermal insulation composite system (ETICS) made of polystyrene

Since insulation has no effect on the air exchange of a modern house, your choice has no impact on issues like mold and moisture problems inside. It is always a matter of proper ventilation in airtight houses, which all must be by law....

If one thinks they are doing something good for the environment by choosing mineral wool instead of EPS... you can do that. But it does not change the fact that the house is airtight per se or have any impact on mold etc. inside. The durability... Both options will outlast you by far. Here I could mention the Frauenhofer study again... In 40-year-old ETICS buildings there are absolutely no signs of material fatigue... zero! The stuff probably lasts longer than the stone behind it.

We may soon face a similar decision. So our favorite offers stone wool or wood-based insulation as an alternative to Styrofoam for the KS – with an additional cost increasing in price.

Insulation with stone wool etc. is more expensive for us than Ytong. Therefore, in this case we would build monolithically.

Use sand-lime brick+polystyrene. Properly processed, you have nothing to worry about for decades, including health-wise, and you also get better sound insulation.

I don't want to spam the thread now, but is it really as described?

Meaning that the claims of higher durability and indoor climate benefits of stone wool are not true?

Then you can save your money.

Do you also believe that Nimm 2 is full of good vitamins, or that Kinder chocolate is healthy because of the extra portion of milk? At least that’s what the advertising says.

How is the stone wool supposed to change the indoor climate? There is no contact with the interior, nor does it affect the air exchange.

Durability... No idea, but EPS will outlive you... Even if stone wool lasts 200 years instead of 100... (I have no idea...)... Where is the advantage?

I look at the features and question them. Especially in the construction sector, there are various philosophies and preferences, so as a layperson, one initially only tentatively absorbs this. For me as a layperson, Styrofoam simply seems more sealed than mineral wool, but I rely on personal perception in my areas of expertise.