As written above, apart from WOLF no one offers with a floor slab. This has to be solved locally in Austria, which is why I inquired the rest at STRABAG.
The floor slab is at the same time a physical and also contractual basis for the house. A construction contract for the house is concluded with the house provider. To fulfill this, the floor slab with quality requirements from the house construction contract is needed. If these are not met, house construction cannot commence. The logical consequence is that the responsibility for this physical basis should not be separated from the fulfillment of the contract, meaning that the floor slab or at least the responsibility for its proper execution according to plan belongs in the house construction package. Whether the provider is used to it differently is their problem; oneself is the opposing party here.
Naively thought, a floor slab is a few cubic meters of reinforced concrete poured into formwork, anyone can supposedly do that, so nothing can go wrong there. In practice, however, it happens quite often that someone with poor blueprint-reading skills manages to do something wrong. For example, a flawless floor slab of the correct concrete quality with the correct steel reinforcement, laid on the correctly compacted ground surface—only unfortunately in the wrong position: ten or even twenty centimeters to the left/right/front/back off, or also in height from the wrong reference point. Or the openings are at the “wrong right spot” (x,yz meters from a plan perimeter edge in the plan according to the specification, but x,yz meters from the slab edge in reality). Either both are in the same scope of work and the person who has to deal with it and the one responsible are the same—or the client conveniently ends up with the “black Peter” card, being the one held responsible. Therefore, I know no mercy in this regard.
Cheap floor slab pourers are around every corner, but in case of damage they cannot be held accountable. Therefore, in my opinion, a separate floor slab pourer is only usable under the condition that he accepts issuing a performance bond, i.e., is willing to wait for his money until the electrician has accepted the grounding of the foundation and the house supplier has accepted the floor slab (and the surveyor has confirmed the work is in the correct position). In Germany, cheap floor slab pourers like to go bankrupt – are they of a different kind in Austria?
I only advise clients with construction sites in Germany, accordingly with German legal risks, hence my advice for caution.
