Prefabricated house is leaking. We feel cheated

The former construction manager doesn't know that either. The error cannot be precisely located. What kind of material can I use for that?

What kind of material can I use for this?

You can only say that once the fault is localized.

Plaster leaking -> plaster
Windowsill leaking -> new windowsill? New/different plumber's screws? ...

Temporary sealing -> acrylic
Permanently sealing structural joints outdoors -> PU sealant approved for the respective adjoining materials (wood, plaster, sheet metal...). Available, for example, in various colors from the yellow/red ones from Baar in Switzerland.

Still: Until you know where the mess is coming from and what may be damaged inside the wall, all of this is just botching.

Expert?

Already a start.

The former site manager doesn't know either. The error cannot be precisely located.

Well, someone must have thought about why the construction had to be changed.
And a site manager is not necessarily the expert himself.

I’m not going to mention the name yet... more on that in a moment.

That doesn’t matter anyway.

He also gave us the tip to write to the managing director and threaten him with public disclosure of the matter.

But said and done. Wrote a relatively nice email and promptly got a reply. I was informed that we would receive a written offer and that if I took the matter public they would take legal action and carry out no repairs on the house.

Ok! You didn’t threaten, but you must have mentioned the public already, the company wouldn’t come up with that on their own.

The site manager has since quit! That says it all.

No, that says nothing at all. Job changes happen in this industry.

Defects are not reported by email, but by registered letter.
However, you are no longer in the position to notify the company of defects at all.
Did you still have the site manager’s phone number in your phone so that you contacted him?
Or do you have a 10-year warranty?

Otherwise, after 8 years you are now in the position of the owner of an aging house, where you take the Yellow Pages and look for a specialist to take care of the renovation. You have information about the causes of the moisture.
Especially if the company built according to the state of the art at the time.

If, of course, you want to make a big fuss, then go to your local rag... however, that can also get expensive if it’s about defamation.

There may be something regarding hidden or concealed defects, which can probably only be clarified through a lawyer. I would start with just one window and have it opened and examined by a regular local company. Possibly, this will also reveal the right points of approach to take action against the prefabricated construction company.

Something might be possible with concealed or hidden defects, but it can probably only be clarified through a lawyer.

But after 8 years? Well, that means really having a lot of patience; especially because it has to be fraudulent or particularly fraudulent; and proving that?

So I would have an expert take a look at it; and then in the next step have 1-2 windows treated accordingly by a local craftsman