Can you elaborate on that? Not just that it exists, but why there can be 3 opinions on the given matter?
Because it is human nature? Regardless of profession or vocation. There is no DIN standard that doesn’t allow a certain margin of interpretation
I suspect the site manager of the construction company.
You suspect, that’s interesting. Did you unequivocally ask the site manager whether the basement ceiling is even properly ready for covering, or whether compensation measures need to be taken? There should have been an acceptance inspection before starting the self-performed work, right?
As I wrote, I noticed the uneven floor before laying the parquet.
That would be new to me in this clarity.
But, to cut it short — in my opinion, you can only blame yourself for the “black Peter”. Although you noticed the “uneven” floor, you did not immediately complain, but cheerfully laid the parquet. In that respect, you bear a considerable share of the blame for the status quo, and I tend to suspect that the supplier of the finished basement ceiling — in the event of a legal dispute — cannot be held responsible because he was only informed by you of a “possible” defect when it was too late for him to rework it. It will probably also be difficult to prove fault on the part of the site manager, since the acceptance effectively took place through your self-performed work. A lawyer can tell you more about this, if you’re lucky, the lawyer here on the forum. I’m only replying from my daily practice; of course fallible.
Lawyers have a nice saying: Ignorance does not protect from punishment
Rhineland regards