Concrete floor without screed on the upper floor/attic, what to do?

We have that throughout the whole house, so only concrete ceiling. Depending on what you want to lay as flooring, you just do a dry construction and there are several options for that. In the bathroom, for example, we have screed and above that Fermacell, and then tiles on top. In the rest of the area, we laid battens floating on the floor, with Steico wood fiber insulation in between, and then screwed wooden floorboards on top. You can also screw OSB boards onto the battens and lay your floor on that. Why should that be a problem? You don’t have to have doors shortened, how many cm of floor buildup is currently possible on the upper floor? What was the original plan and what is now different and why?

Hello " ".
Parquet is a building material that has its peculiarities! It is indeed nice to look at, but it reacts like no other material to changes in indoor humidity by swelling or shrinking. Every parquet!
With concrete floors, it should be noted that they usually have a surface flatness that allows parquet installation (neither floating nor fully glued). Mechanical preparation is therefore necessary by shot blasting or grinding, then priming and then leveling with a self-leveling compound.
That would give us an even (installation) subfloor, but the moisture slowly escaping from the concrete after production pushes toward the room with the lowest moisture potential for at least 2-5 years.
To keep it understandable: in the years following the new installation of the concrete, it will release its mixing water to the room air above.
The parquet will absorb this and consequently expand or even deform.
Therefore – my recommendation – you should abandon the idea of "direct installation". Tiles can certainly be glued directly onto a concrete subfloor; with parquet, however, there is an unpredictable risk of future floor damage due to deformation!
That is why every parquet fitter should reject the undertaking of installing parquet on concrete in this way.
The safest and surely also damage-proof way is via a floating screed. This also complies with the technical rules, which all require a screed as the installation subfloor.
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Regards: KlaRa

The site manager wrote to me that the top of the raw floor to the bottom edge of the door frame is approximately 11mm. So the doors & frames definitely have to be shortened, some neighbors who laid parquet had to do the same.. Everything actually matches the original plan. We just didn't know that we wouldn't have screed on the upper floor/attic. And yes, we are also dealing with developer terraced houses (specifically Deutsche Reihenhaus).

Everything is actually correct according to the original plan. We just did not know that we would not have screed on the upper/lower attic floors.

Did the site manager also mention in which parallel universe this is carried out according to the "recognized rules of technology"?

And yes, in our case it is also about builder-developer terraced houses (Deutsche Reihenhaus specifically).

This is actually said here almost daily in the mornings, at noon, and in the evenings: that what is not included in the construction service description will not be included in the house either. And that there are professional construction service description readers whom a layperson should bring in as support.

Assessing the raw concrete ceiling surface as a floor ready for covering is widespread in this range of house offers, so one could literally speak of "recognized practice"...

... with such offers, one should consider that the large housing developers know their target group (not only the first buyers, but also their successors!) very well and have thoroughly considered to consciously not provide screed (and underfloor heating) on the upper floors. Perhaps they should take their customers by the hand more actively in this regard and explain to them that their standard of equipment is misinterpreted if it is seen as an "upgrade it yourself." Retrofitting hand-stitched leather seats in a Dacia will not be appreciated in resale. Many buyers must unfortunately first learn to read "no screed" as a warning recommendation "no parquet, no giant tiles."

I understand that you explain everything to the best of your knowledge and belief about how one should have done things in the past,

but it is simply too late