Floor slab insulation XPS - Ursa / Jackodur

Good day,

our house construction project is currently at the stage of building the floor slab. Regarding the floor slab - more precisely the XPS insulation - I now have a question for clarification, as I am not sure whether the execution by the construction company is 100% flawless here.

The structure of the floor slab is basically as follows:
- Gravel layer (natural ground)
- Rollierung 16/32
- Construction foil
- Clean layer ~5cm
- 2x10cm Ursa XPS D N-III-L
- Jackon Jackodur KF 300 as lateral formwork/insulation

I have attached a photo (where at least the current upper structure is visible).
My question now is: Shouldn't the Jackodur elements (purple) be pulled down completely to the clean layer?

As the structure currently is, with the Jackodur elements placed on top of the Ursa XPS elements, I wonder whether this is sensible, also with regard to thermal bridges?

Thank you for your feedback.

Since both probably have the same heat transfer coefficient, it amounts to the same thing.

I agree. Somehow the materials have to bond, so they are connected. You have a joint either way. The main thing is that the floor slab is completely wrapped.

P.S.: Wärmebrücke

Thank you both for the feedback!

Hello Hello

In terms of thermal insulation, I don't see any problems there either. But why were different manufacturers used for the board and the formwork? From Jackodur, I know from my own experience surface and formwork elements, which then, wedged and bonded, certainly provide a better connection than the solution shown here.

Olli