Roof constructed too flat - Construction company does not acknowledge the defect

Could it be that the 1.98 m was marked in the drawing as a reference? Because the upper end of the line does not match any drawn edge on the building at all. Could it perhaps be a planning error?

I thought so at first too, but it seems to be an optical illusion.

The loss of space is certainly annoying. What worries me more at the moment is that somewhere a mistake was made. For example, forgetting the rafters or something similar.

In principle, you could exactly calculate the missing enclosed space. Then relate it to the roof price or cheekily ask what an enclosed roof space of value x normally costs.

The dimensional differences in the construction industry must first be taken into account; whether they can be applied will be told to you by a state-certified building surveyor.

Good morning everyone and thank you very, very much for the numerous responses.

It is actually an optical illusion in the plan. That happens to everyone I show the measurement to, and then at the latest on the iPhone screen edge it becomes clear that it goes all the way to the lower edge of the peak.

No one can tell me why this is the case. Probably really a planning error. The architect probably still works with an old program. Back then, he had to do all the cuts by hand. The site manager says that the carpenter may have used different beam thicknesses. The foot purlin is in place.

The building expert gave a thorough reprimand. Only after the construction company's response did I bring up the financial compensation.

If I could measure the ridge height of 8.16 m, this discussion about the approximate measurement could be avoided. I just can't imagine how, Pythagoras or not. The scaffolding is already gone. I'm missing the distance to the center point even if I get the ridge laser-measured from below standing next to the house.

But quite specifically: do I now have to observe any deadlines because of the defect, or can this issue be postponed until the final acceptance? I still have a floor slab for the garage to do.

Best regards
Redsonic

If the slanting was done carelessly and the 12 cm are missing at the peak, I see the error as minor; if the 12 cm are missing linearly in height, the error must lie elsewhere and is, in my opinion, more serious. However, I wonder what this measurement is even supposed to be good for: in practice, no one goes exactly in the middle there, so a certain height only along this line is of little use. The standing height under the purlin ring would have been the one worth defining. However, I would not call it an "optical illusion," but rather planning nonsense.

The purpose of the height is certainly open to debate. We knew that it would be a storage attic, which would mostly be entered while bent over, and every degree of roof pitch was supposed to cost another €500. At the time, we were at the stage where we didn’t want to spend any more money. Therefore, my requirement was to have a space of about 1.5 x 1.5 m where I could stand upright under the roof at 1.76 m.

That would have been the case at 1.98 m. Now it is still the case, but the standing area has shrunk to 0.5 x 0.5 m. And that is the actual problem. Especially since formwork boards will still be added as flooring.

Now it is only a matter of clearly reporting the defect, possibly substantiating it by a deviation in the ridge height, and obtaining the highest possible compensation.

If I could measure the ridge height of 8.16m, we could avoid this discussion about the approximate measurement. I just can’t imagine how, Pythagoras or not. The scaffolding is already gone. I’m missing the distance to the center point even if I can laser the ridge from below while standing next to the house.

You take a few steps in front of the house and place the measuring device on the ground. Measure once against the house wall and then diagonally upwards from ground level to the gable. Then you have measured c and a, b is what you’re looking for and shouldn’t be a problem anymore.
You can also go up on the roof and measure down from the gable.
For more precision, a surveyor or someone with such equipment can help you.