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

Exactly. But is that binding?

It is binding if it is stated as such, namely as RBM in the contract.
A good general contractor will then inform you about the deductions -> screed, floor covering, and ceiling cladding, but also the rafter position.

The clarification distinguishes a good general contractor from a "not so good" one.

binding? actually yes, the bricklayer should certainly be able to read the construction drawing!! there is certainly also a concrete frame, it should then have the correct height.

But the 150 cm knee wall height in your drawing is about 50 cm inside the room. Directly at the wall, the knee wall height is given as 125 cm.

No. The measurement, like the other one, is directly at the exterior wall.

No .. see the red crossed lines, it’s only about the knee wall measurement inside.

-1.25 m knee wall, measured between top edge of raw ceiling and bottom edge of finished ceiling, so 1.38 m after screed, or about 1.35 m in the "finished room" with flooring

No .. for the drawing the finished measurement would be 125 - approx. 20 cm floor construction = 105 cm

That much time must be spent .

You are right. Now I was mistaken after all, I wrongly assumed 1.50m, correctly wrote 1.25m. Then it is around 1.10m with 12cm screed construction and 3cm covering.

The 1.50m refers, in my opinion, to the height in the corner. The line is not drawn correctly. On the other side, the dimension lines are also covered by the dotted lines.

Anyway, I believe there is no doubt that the drawing is clear.

The question is, who is correct now. So whether the knee wall should be 138 cm, or 128 cm as it is now.

Correct for what purpose: a price reduction, even if no problem arises from it? Be glad if you don’t have to stretch to be able to look out the window. About 125 cm is usually an ideal effective knee wall, and now you have it.

Can't really explain it

Oh, shouldn’t that have been clarified before signing?

The knee wall is the raw wall height, so in your case the 1.25. The 1.50 m measurement is a meaningless measurement...

I read the drawing so that the wall and ring beam make up the 125 cm and with the foot purlin added, then 150 cm results, each measured from the top edge of the raw floor.

Anyway, I believe there is no doubt that the drawing is clear.

According to the drawing, the distance from the top edge of the raw floor to the top edge of the foot purlin is 150 cm. So one meter fifty is stated there, but for a dimension that is actually not user-oriented.

Well, I still see it a bit differently.

This weirdly dashed line that runs diagonally and goes over the door, no idea what that's supposed to be.
Definitely nothing to do with the ceiling, otherwise it would only go just above the door, which it doesn't.
Therefore, the 150 still goes up to the bend of the drywall panels.

125cm seems way too small to me, not for nothing we actually wanted 150 cm, also the loft bed we bought at 140 no longer fits underneath.

And why stretch from the window? We have floor-to-ceiling windows

Yes, right for the purpose, if it is like that, to get a discount, nothing else works.

Before signing...Hm...Yes, but if you get lied to about everything, it doesn't help either.

The 125 wall was correct, I believe the 150 was too once