Is the knee wall too low? What does the measurement refer to?

Hello, we are shortly before the handover of the house.

Recently we measured the knee wall.

According to the contract, it was supposed to be 150cm finished.
However, these are all clear raw construction dimensions.
Of course, we did not think about that and we were never informed about it.
Well, now it’s too late.

Our screed buildup on the upper floor is 12cm.

So, without flooring, it should actually be a knee wall of 138 cm.

Our site manager, who has authority but gets nothing done, agrees with me on this point.
(We have 2 site managers, whereby the 2nd one isn’t really authorized to give orders)

However, we only have a 128cm knee wall.

The 1st site manager wanted to measure it and give me information, of course never happened.

The 2nd site manager writes:
“The clear raw construction height is measured from the top edge of the raw ceiling to the bottom edge of the collar beam.

The height of the knee wall is also correct, because I also checked it there. Here, too, you measure from the raw ceiling to the bottom edge of the rafter.
The lining must of course be deducted. When measured on the roof slope, this results in about 9 - 10 cm vertically.

So 1.50 m - 0.09 m - 0.13 m for the screed (without covering) results in a dimension of 1.28 m or, with 0.10 m suspension, a dimension of 1.27 m.”

Here we have exactly a 10cm difference.

According to my technical understanding (I also once took technical drawing in training and learned assembly technology), the dimension in the plan is from the raw floor base to the “bend”, i.e., the beginning of the roof slope.
(Attachment)

After another email, there was another statement from the 2nd site manager:
“In all given dimensions, the finishing covering always has to be deducted. For example, the interior plaster, the screed, the ceiling covering,
the door frames, etc.

A finished installation height is not specified, because due to the tolerances in structural work, deviations of up to 4 cm can occur.”

I then tried to explain to him again that the dimension starts from the floor and the ceiling has nothing to do with it.

Another email from the site manager then:
“Attached I am now sending you an excerpt from the red drawings and have marked the dimension chain for the clear raw construction height.
Here you can clearly see that the dimension chain relates to the wooden beam and not to the lining.
Why should the dimensioning of the knee wall suddenly relate to the finished ceiling, while all other dimensions can be traced back to the raw construction
and only that for the knee wall not.

If you are still not satisfied with my explanation, then you will have to contact the project planner again, because I have now reached my limit with my explanations.”

As I said, in the plan, in my opinion, you can also clearly see the plasterboards on the wall and ceiling.
And the dimension goes up to the transition (on the plasterboard).

I hope for an independent expert opinion here.

Sorry for the long text

Thank you very much

(We have 2 site managers, whereby the 2nd one is not really authorized to give instructions)

Two - so that one does not know what the other is doing, or so that there can be a deadlock in technical matters? But what is actually the real question: who gave / understood which measurement "correctly", or is it about something practical (certain furniture no longer fits)?

And yes, the cladding of the ceiling plays just as much of a role, especially in the roof area.

Structural height is structural height, for the clear room height you subtract the floor and ceiling construction and then you have the value.

The question is who is actually right.
Whether the knee wall should be 138cm, or 128cm as it is now.

, but why? According to the drawing, the measurement clearly refers to the distance from the floor to the drywall ceiling, so only the screed should actually be deducted from the 150cm.

2 site managers because:
We have a contract with Company A (Seat) (site manager No. 2 and managing director of this company), which belongs to Company B (VW), which in turn cooperates with Company C to buy materials cheaply.
At least, this is how it was explained to us.
In reality, Company C not only provides materials but also the site manager (No. 1), trades, and specifications regarding what is included in the house.
Can't really explain it properly.

But the 150 cm knee wall height in your drawing is about 50 cm in the room. Right against the wall, the knee wall height is specified as 125 cm.

Shell construction height is what it is; for the clear room height, the floor and ceiling structures are deducted, and then you get the value.

This is a GENERAL statement. You have to carefully read the respective drawings and construction descriptions for that.

The knee wall is the raw wall height, so in your case 1.25. The 1.50 m measurement is a meaningless measurement... of course you can insist on it, then the argument starts.