Thermal bridge during house inspection

Hello dear forum

We are about to accept the handover of our new building. Now I have noticed two thermal bridges where the concrete protrudes about 5-6 cm and was not insulated. Once above a corridor window to the concrete ceiling of the roof and at a basement window, practically the entire surrounding reveal. I will now complain about this to the respective companies!

Now I would like to know how thick the insulation made of Styrodur has to be?

Where is this prescribed or can this be legally looked up and calculated how thick a thermal bridge must be insulated?

Possibly other changes will come up due to the insulation thickness, such as shortening a windowsill or moving the corridor window out of the cold zone, since with the frame above already sitting right on the concrete, the frame above would be inside the insulation, which would frankly look sh....

I would be very grateful for your help,

Best regards Uwe

Hi,

in principle, of course, no thermal bridges should occur. And without an on-site inspection, it is logically impossible to give an assessment from here. However, what I would advise you is to get an expert for the acceptance.

Is there actually no planning for the house? Or were thermal bridges planned and no one noticed? What does the construction manager say?

Regards

Hello,

...Where is this prescribed or can one legally look up and calculate how well a thermal bridge must be insulated?

For every new construction project, there is an energy saving ordinance certificate. This contains a flat loss factor for the thermal bridge, usually 0.05 W/m²K. However, this presupposes that the thermal bridge details correspond at least to the provisions of DIN 4108 Bbl.2. Otherwise, an equivalence proof is required. The designer is responsible for this. After completion of the building, an energy saving ordinance certificate must be created. The aim is to take into account deviations between planning and execution. However, it is not uncommon that the certificate and the report have the same issue date.;) A rogue who thinks badly here!
Not infrequently, this leads to a building law violation and/or subsidy fraud (KfW funding).

Best regards.