I need your help with the vapor barrier/blocker.

Hello,

I was at a house construction fair today about house construction with drywall.
I plan to add an extra floor or expand on an existing house.
Since I want to avoid problems with the statics and water ingress into the existing house during the construction phase, I have decided on drywall. (Of course, also with the thought in mind drywall = wood = healthy)

Now, at the fair today, I saw that many manufacturers rely on a vapor barrier or vapor retarder. Especially the well-known manufacturers.

But I can't get the thought out of my head that the vapor barrier/retarder cannot just make the water disappear but must hold it somewhere and the water must accumulate. Additionally, the walls are absolutely tight. So where does the moisture go???
The vapor barrier is always located behind the construction where the installation by the electrician, etc. takes place.

I have now looked around on the internet and informed myself and must say that I am now quite scared.
What I absolutely want to avoid is moisture in the wall and the associated mold growth!!!

According to information and horror reports, moisture and mold usually form with incorrectly installed vapor retarders that suffered damage during installation.
I want to completely do without this foil because my common sense tells me that it cannot be good to live in a food wrap.

Is it possible to do without a vapor retarder or vapor barrier in exterior walls?
If yes, what options are there?
Am I suffering from delusions or is this a commonly widespread phenomenon?

Hi, so I assume you mean timber frame construction for adding an extra floor to your house. So it is possible to do without the vapor barrier by installing OSB boards on the inside and then sealing the joints. Since the OSB board has the same function as the vapor barrier. Alternatively, you can also use a climate membrane, e.g. Isover Vario KM

A solid wood wall also does not require a vapor barrier :-)

Thank you for your answers. Unfortunately, there were not many manufacturers with solid wood walls. Actually, there was only one, and that was Thoma Haus. I really liked the concept. According to the representative, the Thoma Haus is 5-10% more expensive. However, I cannot confirm if that is true but have to believe what I am told. Why do well-known manufacturers not offer solid wood construction?

Many manufacturers offer solid wood walls. Just search under the keyword Blockhaus ;-) Ours is even called Vollholz, just in English.

But is the problem of condensation with solid wood completely eliminated 100%?