Blower-Door-Test result (n50=1.13)

Thanks for the answers.

The team went through every room during the negative pressure measurement and checked all corners. The statement was that everything is tight.

They suspect that it could be either the apron or the chimney?!

Would you not worry about the value?

If that is true, that it is due to the chimney and the apron and you were there, then I wouldn't worry. Otherwise, seal the chimney and check again.

What price standard did you pay? Is it a high-priced house anyway?

What kind of standard did you pay for? Is it an expensive house anyway?

What exactly do you mean?

Energy Saving Ordinance with ventilation system or passive house.

With Energy Saving Ordinance with ventilation system, the value is not exactly good, but within the norm and you will not be able to do much.
With passive house standard, you have failed and it needs to be revised.

Yes Kfw 40 with ventilation system. Yes exactly, not good... I have to be able to do something to improve the value?!

I thought about hiring an engineer from the city to look for further leaks...

We were just under 0.4. Solid house with a ventilation system, no special precautions. Ventilation system only for comfort reasons. But the window manufacturer knows how to do a RAL installation, etc. - then it will be properly sealed.

I don't feel like going through the standards now, but Google tells me that the maximum value would be 1.0 for new buildings with mechanical ventilation systems!?