High moisture in precast concrete garage - normal?

Hello,

we built a house last year and had a precast concrete garage installed next to it (April 2021).

For 2-3 months it has been noticeably damp in the garage (not just since it got so cold, but already before). It is getting worse. Several items we stored in the garage, including cushions from the garden furniture, have become moldy and tools and metal are already slightly rusted. We no longer even park the everyday car inside, so that no more moisture from the car is brought into the garage. The garage is also ventilated every day, otherwise there would probably be even more moisture inside.

I am attaching a few photos. The garage manufacturer says it is "normal." Of course, I know that condensation can occur in this season, but not that strongly.

In addition, the water is visibly only running down the right side of the garage – exactly where the garage door opening normally is. In our double garage these walls have been plastered again. Just to clarify: our double garage is actually two single garages, which are not next to each other but placed one in front of the other.

Maybe there are some experts here who can say something about this. But it cannot be that you cannot park your cars there and also cannot store anything without it becoming moldy or rusted.

That looks to me more like poor sealing of the roof? How does the wet corner on the outside look?

Do you mean from above or from the side? The garage is plastered on the side. - but I haven't looked at it more closely yet. From above I would have to check if I can see anything. But it's not just a corner, it's the entire right side.

I also find the crack in the ceiling strange and it also looks rusty, at least somewhat brownish.

Also, the water is visibly running down only on the right side of the garage - exactly where the garage door opening usually is. In our double garage, these walls have been re-plastered. Just to clarify: our double garage is actually two single garages, which are not next to each other, but placed one in front of the other.

"I didn't understand anything."

But there is probably something leaking if the "goo" is coming from the ceiling.

Does this help you:


This is how the 2 single garages were arranged into a double garage. Normally, the doors are on the right side. - These walls were closed up again and plastered.

So two single garages were "raped"? The existing door openings were each bricked up, then in the rear garage basically a wall was removed and in the front one even two!!! Why was this done and how was it executed? The structural integrity of the garages no longer fits "back and front". You mentioned a crack in the ceiling? And where exactly (in the drawing) is it now wet?