Costs for the heating & sanitary trade

So the flat ducts are 60mm. Whether you need the full thickness more or just a little more should probably be clarified with the structural engineer. Possibly your ventilation installer simply knows from experience how much more is needed.

Thank you - we just had a conversation with the HLS planner. He says that laying it in the concrete ceiling is usually significantly cheaper than in the floor. The flat ducts that would be used in the floor structure are considerably more expensive than the pipes in the ceiling, and the additional screed is more expensive than 2-3 cm more concrete in each ceiling. Therefore, we will have him plan it in the ceiling, statically no problem from his experience. With the general contractor, it can of course look different if he calculates it differently.

Provide enough outlets and use a good pipe diameter. Simplifies the implementation of the air volume with little noise.

Yes, that my GÜ and especially his sub go down some rather strange paths, I am slowly noticing more and more. The sub is out, but now the ceiling getting even thicker is no longer possible. However, I don't need more screed. I simply have 8cm insulation in the floor on the intermediate ceiling. I'm curious if I'll still hear impact noise there...

I'm not sure if this was in the thread where someone reported that their plumber wanted to do the entire sanitary installation after the interior plastering. I had to find my own HSLer after the subcontractor of the main contractor was fired. And look, my main contractor also wants to have the interior plastering completely finished and then wants my plumber to chase for the concealed installations. Let's see what he thinks about that. It's interesting that the main contractor then sends his plasterer to me again to fill the chasing. He will be pleased... I'm curious how it will look at those spots then. I will probably have to sand again separately.

That was the case with us and is still planned that way. The neighbor next to us as well. Since he goes before us, I am curious.

However, since we will have taping work done by the painter in Q3 and use tiles in the bathroom area, I imagine it to be unproblematic. According to the plumber, he has had good experience with it and according to research, it should be okay if done properly.

The screed will come afterward.