Plastering and painting the technical room in the basement - procedure?

Hello, our shell construction (basement concrete, Poroton masonry) is complete, the roof is on, and the windows will be installed soon. Before the installations come, I would like to prepare the technical room in the basement. Since I am (still) a layman, I want to start this work myself in the technical room because it doesn’t matter so much here in terms of aesthetics and I can gain experience. The joints in the concrete ceiling should be filled and the ceiling as well as the exterior walls painted. I am aware that there will be small holes if the surface is not fully filled. The interior walls are made of Poroton and should be plastered with a base coat and then also painted white. The following questions have arisen:

1. When can one start the filling and plastering work regarding residual moisture? How long should one wait? The basement ceiling has been in place and poured since 24.06.2021. The walls, especially in the lower area, are still damp due to the wet weather in recent weeks.

2. Which filler would you recommend for the joints in the ceiling? Rotband? Multi-Finish (universal)? Others? Is a pretreatment of the ceiling necessary? If yes, with what? Primer? Across the entire surface or only the joints?

3. Which base coat would you recommend for the Poroton interior wall? Gypsum? Lime? Others?

4. Which paint would you recommend? Dispersion paint? Silicate paint? Is any further pretreatment necessary on the plaster and/or concrete before painting?

Many thanks in advance for your help.

Too many questions? Stupid questions? Or are all the plasterers still on the construction site? ;)

We are talking about the technical room in the basement... Shortly before the equipment arrived, we applied white paint on the concrete. Done. After the equipment was installed, we could have completely repainted. Can you imagine how it looks when after painting by the plumbing crew, 5 large water-cooled core drillings are made in the ceiling and 6 in the outer wall? Every filler is like pearls before swine. Later you can patch and repaint, but if you have been filling for hours, don't be there when the equipment is installed.

"I think it will be about here, I'll drill a hole... oh, doesn't quite fit, I'll just drill another one." "I need something to put things on, I'll screw a holder to the wall." "My hands are dirty, but I can't wash them all the time, it's only the technical room." "Oh, we splashed some dirty water on the wall here, I'll quickly wipe it with my rag."

In my view, a finished floor would be more decisive; you can't install that anymore once the heating is in place.

Too many questions? Stupid questions? Or are all the plasterers still on site? ;)

Here you are more likely to get opinions on question 4. In general, there are more opinions than answers here.

1: Plastering walls: If the windows are installed. I can’t say whether the walls have to be dry, but it is important that the building materials are processed according to the manufacturers' recommendations. Maybe just check there or have a professional guide you. For your questions, it seems quite "daring" to want to carry out the trade yourself (no offense). It’s something different than just painting or wallpapering (which is also a real craft but still more manageable as a layperson).

4: I used silicate paint. But before that, painter’s fleece for crack bridging. Also primer. My painter for the stairwell didn’t use primer. Where the technology will go, simple white paint may also suffice. First, fill and sand the holes with finishing filler. PS: The work (distribution cabinet, heating etc.) was already completed there.

For your questions, it seems to me that wanting to do the trade yourself is already quite "bold" (no offense). It's something different than just painting or wallpapering (which is also a real craft but can still be managed as an amateur).

I am aware of that. But at some point in life, you just have to start with such things and gain experience. Otherwise, how can one become a DIYer? Trial makes wise. And with the utility room, it’s not so bad if it’s not perfect.

Of course, we will have the living rooms done by a professional.

We are talking about the technical room in the basement... Shortly before the technology arrived, we applied white paint to the concrete. Done. After the technology was finished, we could have completely repainted. Can you imagine what it looks like when, after painting from the sanitary installation, 5 large water-cooled core drillings are made into the ceiling and 6 into the outer wall? Every filler is like pearls before swine. Later you can patch and repaint, but if you have been filling for hours, then don’t be around when the technology is installed.

Breakthroughs in the concrete ceiling were already taken into account at the factory (filigree ceiling). In addition, we have a supply shaft in which all cables, wires, and pipes run. Nothing else will go into the exterior wall in the basement.

From my point of view, a finished floor would be more decisive; you can no longer lay that once the heating is installed.

The heating will be placed on some sort of stilts, as it comes before the screed. According to the heating engineer, you can still get under it after the screed to, for example, tile.