Floor plan planning shortly before submitting the building application

Drywall measures had to be dismantled again,

That's why you do it afterwards.

Would have expected better in such an "expensive" house :-/

That has little to do with each other. Many corners, many possibilities for leaks.

In this respect, the result is okay, you can live with that. It shouldn't be a 55er anyway, right?

That’s why you do it afterwards.

That has little to do with each other. Many corners, many possibilities for leaks.

In this respect, the result is okay, one can live with that. It shouldn't be a 55 anyway, right?

The requirement also results from the Energy Saving Ordinance. 1.5 is the minimum with a ventilation system. Otherwise, it's illegal construction.

And couldn't more be done to get the value even lower?

They still need to plaster some areas, which will help a bit. Then the ventilation system in the cloakroom is not finished yet, which will also have an effect.

On the other hand, the blower door test contractor says that with houses with controlled residential ventilation, he usually ends up between 1.2 and 1.3 and that in such cases he is done with his work within 15 minutes. He also said that he often works for this contractor and that it usually goes better. He repeatedly told the site manager that he does not know them to be like this.

I explicitly told them that I will commission my own blower door test for the final acceptance and that it would be fatal to stop at 1.5, because if there are still minor things happening during the execution, such as with the drywall ceiling or whatever, then we will be stuck.

Where were the main spots where drafts occurred? Vapor barrier or also electrical work?

No, the electrical work was okay. Air came through a cemented-over opening to the garage that the electrician made because he didn’t plaster all the way down to the floor. Both companies are blaming each other for it. But now it’s closed. Then air came through everywhere behind the pipes running through the rooms because those are not plastered. They are still scraping putty between them everywhere today. I have to go take a look at that shortly. Otherwise, there were numerous, partially large holes in the vapor barrier on the upper floor. All corners in the shower areas behind the drywall were affected. The site manager spent 1.5 hours fixing this with his adhesive tape alone. But also small cracks and loose attachments. I just wonder if loose attachments could become an issue again later.

Then it also leaked around some windows. According to the blower door contractor, this is largely normal. The painter can later seal the joints between the windowsill and the window.

Really dumb that the KfW value is so high because with 1.5 well ... it’s like having a 4 in your degree

In connection with controlled residential ventilation, he says it doesn’t get much better because of all the ventilation pipes.

So the result is okay, it’s livable. It wasn’t supposed to be a 55, right?

No, it’s not a KfW house. It’s a completely normal Energy Saving Ordinance 2016 house. For that reason, they won’t mess around forever trying to lower the value further. I will take another look at it before the final acceptance.

Those who did the tests with us refer to values from 1 onwards as botched work and hardly occur. With ventilation systems - many have that.
A airtight shell construction without exterior plaster, screed, etc., ready for occupancy accounted for 0.1 with us.

Windows AND painters, when I hear something like that, everything spins around for me. The fact is, then the windows are not installed properly. The painter has nothing to seal there at all. At the transition between window and windowsill, there is usually an airtight tape inside and compressible foam tape outside.

And a controlled residential ventilation system has nothing to do with the humidity. There are no pipes in the exterior walls, and the rest are in the ceilings. There should be no leaks there.

So the blower door person seems to be a relative of the general contractor..

Worse than the leaks are probably the holes in the vapor barrier. That really is not acceptable at all. That risks enormous damage to the structure in the near future. How on earth do such holes get in there?

Windows AND painters, when I hear something like that, it makes me turn everything over. The fact is, then the windows are not installed properly. The painter has nothing to seal. At the transition between window and windowsill, there is normally an airtight tape on the inside. Outside, compressible tape.

I will take some photos later.

And a controlled residential ventilation system has nothing to do with the humidity.

I don’t understand the connection to humidity now.

Worse than the leaks, however, are probably the holes in the vapor barrier. That really won’t do at all. You risk enormous damage to the structure in the near future. How on earth do such holes get there?

Supposedly, the drywall installer was supposed to check everything before the blower door test and cover holes. The site manager was very annoyed that this was not done. Then he did it himself with some kind of duct tape.

Somehow the wrong spot behind the showers was taped off. I think the site manager said that the executing expert taped the drywall instead of the wall or something like that. Don’t remember exactly.

I will call my expert soon, inform him about the events, and then we will see if he thinks it still makes sense to come.