36 cm Ytong exterior wall, solid construction, mold formation, insulation

Can it be a bit clearer?

What are you expecting? The "ultimate" solution for free?

What do you two experts mean by "universal"?

Every statement, including those from experts, is influenced by individual (economic) backgrounds. As a result, corresponding statements naturally differ.
"Universal" is simply my point of view. Competing claims, in my opinion, can only be optimally satisfied through "separation of powers".

regards

Hi,

I see it similarly to €uro. For the different functions of a construction, the ideal building materials should be selected. For load-bearing (structural), sound insulation, thermal insulation, and summer thermal insulation. All these different requirements cannot be fulfilled with a single building material. Certainly, the question always arises: What is important to me, what can I do without, and what compromises am I willing to make?

I consider a sustainable approach to be sensible. Good thermal insulation, good physical properties, and low maintenance (referring to the entire construction).

Regards

For load transfer (structural engineering), sound insulation, thermal insulation and summer thermal protection. All these different requirements cannot be met with a single building material.

Aerated concrete proves the opposite.

From my point of view, thermal insulation bricks are not a "single" building material, but load-bearing building elements with internal insulation. Ideal is relative. If you mean profitable = efficient by that, okay. Ideal in the sense of best possible, on the other hand, pure waste of money.

1. Load transfer (structural engineering): is calculated. Regardless of the wall structure.
2. Sound insulation: Isn’t it mainly determined by the weakest links (windows)?
3. Thermal insulation: This is provided by the Energy Saving Ordinance. Further improvements are commendable but probably unprofitable in 90% of cases.
4. Summer thermal protection: Okay, a bit of mass for the temperature phase shift should be there... or automatic shading systems (exterior blinds).
5. Don’t forget: Exterior insulation (ETICS) = faster dirt accumulation on weather-exposed sides! (Maintenance costs or impaired appearance)

Regards
Olaf

.... All these different requirements cannot be met with a single building material.

Confirms my fundamental view!

.... Certainly, the question always arises: What is important to me, what can I do without, and which compromises am I willing to make?

Correct, but this presupposes that the decision-maker has appropriate templates (variants) available. The interaction between building structure, climatic location, building orientation, user behavior, and the resulting sensible system technology is still often a foreign concept today. After all, some, in my opinion unfortunately too few, universities of applied sciences have now recognized this shortcoming and accordingly offer a holistic and overarching education of this necessity. Unfortunately somewhat late, but at least something! Best regards

Aerated concrete proves the opposite.

By no means!

1. Load transfer (Statics): is calculated. Regardless of the wall structure.

Of course it is calculated. But don’t I have to consider function and economy? Best building material for load transfer: sand-lime brick

2. Sound insulation: Isn’t it mainly determined by the weakest links (windows)?

Not only if I don’t install old barn windows. Best building material for sound insulation: sand-lime brick

3. Thermal insulation: Is ensured by the Energy Saving Ordinance. Further improvements are commendable but probably unprofitable in 90% of cases.

I cannot insulate only with the Energy Saving Ordinance. It specifies the minimum thermal protection, but it couldn’t care less which building material I use to achieve it.
Best building material for thermal insulation: not sand-lime brick

4. Summer thermal protection: Okay, a bit of mass for the temperature phase shift should be there... or automatic shading systems (external blinds)

Here not only the heat input through the windows plays a role, but also through the wall. And, of course, the storage capacity of the building material.
Best building material for summer thermal protection: sand-lime brick

5. don’t forget: external insulation (EIFS) = faster dirt accumulation on weather-exposed sides! (maintenance costs or impaired appearance)

I also think EIFS from the outside is dumb

You people from Schleswig-Holstein have it easy. Not everywhere in the country has the tradition of double-shell construction. Here in the East, according to my previous research, the following wall construction is common for GÃœs:

1. Aerated concrete 17.5 + ETICS
2. KS + ETICS
3. Liapor precast concrete parts + ETICS
4. Brick, T10 unfilled

The surcharges for double-shell construction are enormous. A GÜ salesperson confided in me recently that due to the high level of construction activity and the lack of skilled shell builders, the price has risen by 50%...