Are cracks to be expected in monolithic wall construction without ETICS?

I honestly don't know why you can't or don't want to answer me properly on a specific question.

Your specific question was "I wonder whether they then all accept cracks in the plaster, or whether this is possibly just no longer an issue nowadays?". The answer is: yes, it is not an issue. You didn't ask about execution plans or anything similar. What is your problem? Are you building yourself or are craftsmen building it?

To actually say something about the main question of the thread: I find the floor plan quite interesting. ;)

Joking aside: I fear you will only get insufficient answers to the specific question of execution here in the forum. There are fewer craftsmen and construction experts around here and more builders, who mostly only have dangerous half-knowledge (I include myself here and would be glad to have at least "half" knowledge).

Thank you for the

Your specific question was "I wonder if they then all accept plaster cracks, or if that is possibly no longer an issue nowadays?". The answer is: yes, that is not an issue.

You did not ask about execution plans or similar. What is your problem? Are you building yourself or are craftsmen building it?

I want to understand as much as possible, which is why I research and ask questions. Of course, craftsmen will build it; I will help where I can.
If I knew beforehand that with monolithic walls combined with massive roller shutter boxes there might possibly be unavoidable plaster cracks, I would consider ETICS.
Perhaps there is experience with this topic here in the forum and someone might then say to me "make sure that reinforcing mesh is embedded there!" or "definitely don't use this type of roller shutter box!" etc. etc... I cannot specifically ask about things I do not yet know.

But gladly be specific: what exactly should be considered in planning/tendering when wishing to build monolithically with Ytong? Is reinforcing mesh in the plaster sufficient as a bridge between the wall and the roller shutter box to avoid plaster cracks? Does this possibly have to be "special" or have a special layer structure? Can "any" plasterer do this, or should I specifically make sure that the company has experience with monolithic Ytong walls?
Is all the effort/the headache possibly not worth it because a slim ETICS might be negligible in price—what would we be talking about here, for example, with wood fiber insulation boards?
Or is this construction method generally to be advised against and I should definitely consider ETICS?

These are all bullet points that can rather be read out of the question than "How do you actually find the floor plan?" ;-)

Thank you very much

To say something about the actual question of the thread: I find the floor plan quite interesting. ;)

Joking aside: I fear you will only get inadequate answers to the specific question of execution here in the forum. There are fewer craftsmen and building specialists around here and more builders, who mostly only have dangerous half-knowledge (I include myself here and would be glad to have at least "half" knowledge).

Thank you. I have already browsed a bit here and from time to time it gets very detailed or well explained in terms of content. That it is not the case in my thread on this topic is probably due to the way the question is asked. I also only have very dangerous half-knowledge in a few areas and would like to change that.

Is reinforcement mesh in the plaster sufficient as a bridging between the wall and the roller shutter box to prevent plaster cracks?

Yes.

Does it have to be "special" or have a specific layer build-up?

I am not aware of any special requirements.

Can "any" plasterer do that, or should I specifically ensure that the company has experience with monolithic Ytong walls?

Any plasterer can do it (at least they should), since you are requesting a standard solution.

Is all the effort / hassle possibly not worth it because a slim ETICS might be negligible in terms of cost – for example, what would we be talking about with wood fiber insulation boards?

A slim ETICS for the entire house? Price-wise, it is almost as expensive as a thick ETICS (the material accounts for only a small part of the costs, and the premium for thicker insulation is low in material terms). Since you want to build monolithically (which is actually a completely normal state of the art – just like with ETICS), I wouldn’t throw my entire philosophy overboard for such a small thing. Mixing a "actually monolithic Ytong" with a pseudo-ETICS is the worst, because the most expensive variant.

Or is this construction method generally to be discouraged and should I definitely consider an ETICS?

Both are normal today and at most a question of belief which variant one chooses. One doesn’t want "plastic" on the façade (even though there are dozens of versions of ETICS), another prefers monolithic, and number three says "two-shell masonry with great clinker" is my favorite. Inside the house it makes no difference, only the price differs.

You get plaster cracks due to incorrect processing or because of the different thermal expansion coefficients of the materials. Make sure your wall construction is reasonably homogeneous and that it does not unnecessarily expand unevenly under direct sunlight.

It all goes towards building physics. Important during execution are always the "connections," meaning component A adjoins component B and how this is executed. Besides heat, there is also rain or moisture that can influence the plaster. So drip edges with sufficient distance from the façade, etc. Don’t be too stingy with the roof overhang, etc.

In the base area, you will probably still have mechanical stress. Here too, perimeter insulation is applied during monolithic construction. The plaster then tends to form vertical cracks at the joints of the boards.

ps:
If Poroton, then have the bricks laid with a mortar bed and not by dipping the bricks in mortar. With filled bricks, the latter probably wouldn’t work anyway, but if you don’t use filled ones, then thank me later :)