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

Where should the advantage come from? It is attached to the outside of the wall. Therefore, it has nothing, absolutely nothing to do with what is inside, at least in terms of indoor climate... both only ensure that the energy that enters the house also stays inside.

However, the healthy indoor climate is primarily dependent on humidity. But none of it (neither in nor out) diffuses through the [WDVS], regardless of the material it is made of.

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 have any effect on air exchange. Durability... no idea, but EPS outlives you... even if stone wool lasts 200 years instead of 100 years... (I have no idea...)... where is the advantage?

I agree with you on the indoor climate. The interior plaster is decisive there. We chose lime plaster here. I am worried about the pesticides in the polystyrene (whether justified or not is beside the point for now; also whether stone wool or other insulation materials are really better than polystyrene). It is always claimed that this is not a problem, but the same was said about asbestos for many years.

Sorry, it shouldn't sound reproachful. Right and good attribute, especially in the area of insulation there are many conspiracy theorists who want to make you believe that insulating makes no sense and polystyrene is the evil of all. Pesticides: in polystyrene?? You probably mean those in the exterior paint?! Whether you use a paint with pesticides or not... that has nothing to do with the choice of insulation material. The belief that ETICS facades are more prone to algae is widespread, but read the Fraunhofer study... ETICS facades on average do not have more damage than facades without ETICS... If it should turn out that EPS is toxic...(your asbestos example)... better worry about the 1,000,000 situations in your everyday life where you have direct contact with it, as I wrote above...

Pesticides: in polystyrene??

I mean chemicals against mold, algae, etc.

It refers to HBCD in EPS.

In stone wool, phenol-formaldehyde resin is used as a binder, whether that is better or not.

Hbcd is a fire protection agent.. and is no longer contained in current EPS.

The chemicals against algae etc. are not in the insulation material, but if at all, in the paint on the outside on the plaster...