Monobeton for floor insulation?

Hello

we want to build with a general contractor and are now in the final stages of the contract for work.
The basement is planned with concrete walls and floors. Basement uninsulated - an appropriate insulation is planned against the ground floor.
There are two rooms in the basement, which are intended to be used as hobby rooms later. We will have these executed with a 10cm offset from the start, so that we can later apply insulation on the floor and walls ourselves.

According to the construction description, the floor in the basement is completely made of monolithic concrete. Now I have received the tip that the step to a smooth monolithic concrete floor is actually not necessary if insulation is going to be applied on top anyway. However, our architect says it is not great for the vapor retarder if the floor is not ground down. - What is your opinion on this?

The structure for the floor insulation, the only thing I have found so far is: vapor retarder (foil at least 1.2mm thick), insulation, screed (later a carpet should be laid on top)
Is there a simpler variant here, which is still sufficiently safe regarding mold formation?

How do I have to install the wall insulation (as simple as possible) - unfortunately I have not found any good instructions for this so far.

We laid this monolithic concrete in an underground parking garage. However, that was several years ago. It was applied and smoothed in one single operation. That was it, and this floor remains as it is. It is relatively robust.

Hi Kaffeebart,

This insulation that you describe is okay. I wouldn't make it any simpler. The foil is fine, and mold only forms if there is moisture. You have to rule that out.

BG

Hello Marcel, thank you for your contribution. I somehow have respect for the vapor barrier. - No idea why .. but apparently there are quite a few things to consider to make sure it is installed correctly. Therefore, the question was whether there is an easier way that protects just as well. For walls, for example, these would be calcium silicate boards. - Unfortunately, they are then just much more expensive.

That's true and these boards are really expensive. You don't need to be afraid of the [Dampfbremse]. Just implement it as suggested. Then nothing can go wrong.

Nothing went wrong, I cannot say that. Mistakes were also made with the insulation in our case. Always a damp basement and probably the screed was not dry yet. I am now in the process of finding the mistake.