Precision drywall prefabricated house

Hello, I received a prefabricated house from a German company, whose interior walls are constructed with 10 cm beams and the exterior walls with 16 cm beams as studs. The walls are simply clad on the inside and double-clad on the outside with an installation layer. Gypsum plasterboards with a thickness of 18 mm are used. Now, some walls show a bulge in the individual boards when a spirit level is placed horizontally, about 5-10 mm over 62.5 cm. What are the usual tolerances here? Or will it improve once the house has been heated through?

Hello luffi1,

just google according to DIN 18201 and DIN 18202 for dimensional tolerances.
For "flächenfertige Wände und Unterseiten von Decken" up to 5 mm
are allowed at a measuring distance of 1m. Proper measuring is important!
5-10 mm at 62.5 cm would definitely be a visual defect that I would claim.
I would not expect an improvement through heating.