ᐅ Water Dripping from Concrete Ceiling – What Could Be the Cause?

Hello everyone,

I have a question. We are currently building.
The shell, roof, and windows are already in place.
The rough-in for the heating system will start next week.

Now to my problem. For about a month, there has been a slight drip from the ceiling in the living room.
But only at this one spot. I’ve attached photos.
I have checked everything. The upper floor is dry, the attic is dry. Everywhere else in the house is dry, even though it rained heavily over the past few days.

The bricklayer also doesn’t know where it could be coming from.

What type of floor is installed above the living room ceiling, or has some kind of floor structure already been built there?
Basically, the water can come from other sources too – water finds its way...

It can also get more damp in the case of heavy rain during the shell construction phase compared to when the drainage system is already installed and the facade is plastered.

Construction moisture can probably be ruled out?

Exterior plaster on it? Window sills installed? If not, I would still be quite relaxed about that.

@bauenmk2020 There is no structure on top yet. The floor; prefabricated concrete slab and then poured with concrete.
Construction moisture must be avoided.

@tomtom79 No, the exterior plaster is not applied yet. The exterior window sills were installed on Saturday. Interior window sills have been ordered.

I can only share my own experience. As soon as the roof was installed, even without windows and plaster, no more dripping occurred. Before that, water ran down the chimney and the stairwell!

But it doesn’t really look very wet either. Maybe it’s due to the drying process of the concrete slab?

@Zaba12 yes, I hope so. As I said, otherwise the construction is completely dry everywhere.