Insulation of the upper floor ceiling. Checked by energy consultant?

What does the Blower-Door Test have to do with it?

True. (And other necessary words…

In fact, it is true that compliance with the KfW55 standard is sufficient. How you achieve that does not matter. Your architect / energy consultant has calculation tools that generate a value from many parameters. If you turn one screw (different ceiling insulation), you have to adjust elsewhere so that the overall value (e.g., the total primary energy input) is correct again.

Small example: In the first calculation, we also had this damn expensive WLG 022/023 insulation for the first 6 or 8 cm of the floor insulation. After completing the BD test (which turned out extremely well), we asked our energy consultant to recalculate with these values, and as a result, we were able to install significantly cheaper insulation here.

I can hardly believe that so much of this ultra-expensive WLG023 PIR insulation is necessary. Maybe your energy consultant can offer you alternatives. The calculation tools allow the simulation of alternatives in a few minutes, so it's really a huge effort.

Thank you very much for the many answers. I will call my energy consultant tomorrow. but if he is not willing to talk: will he even come by to check the insulation?

Thank you very much for the many answers. I will call my energy consultant tomorrow. but if he is not willing to talk: will he even come by to check the insulation?

You have already received the answer to that: no.

Does he even come by to check the insulation?

You need someone who fully supports the construction project from an energy perspective. So the energy consultant is obliged to check everything. Whether he comes by, wants to see the invoices, or photos are sufficient is stated in your contract or he can tell you directly if you ask him.

You need someone who completely oversees the construction project from an energy perspective. So the energy consultant is obliged to check everything. Whether he comes by, wants to see the invoices, or if photos are sufficient, is stated in your contract or he can tell you directly if you ask him.

Accompanying and checking also means documenting.
The execution proposals from the tool do not serve as proof of proper execution. Invoices (e.g., insulation material xyz) also do not work, nor can you prove with an invoice that it was installed and executed correctly. I myself documented the correct execution with photos on instruction from my energy consultant. Several times I was instructed to document it more clearly or to have corrections made in cases of incorrect execution.