Corner windows and sliding doors correctly installed - thermal bridges?

Hello everyone,

we have been living in our new build since spring. We have a bay window with a corner window. One part is fixed glazed, the other part is a tilt-and-turn window. At the corner, it is noticeably colder with these cool outside temperatures. Therefore, I got a thermal imaging camera, which confirms my impression.

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Ground floor

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Upper floor

Is this normal or was the connection of the two elements not done properly, something forgotten, etc.?

Furthermore, on the upper floor in two rooms, we have sliding doors (patio) and here too, the floor in front of the sashes, that is the movable part of the window, is noticeably colder. In this case, the window installer adjusted the sashes a bit upwards afterwards, so that there was enough space for the parquet, as otherwise the heights would not have fit. Could it maybe be because of that?
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I would be very grateful for any assessments.

Thank you very much and best regards

lol, great pictures. But no one can make anything out of them ;-) How about some proper "normal" pictures of the condition? No offense, but my crystal ball is currently out of office ... (I guess, barely covered steel support in the corner to meet the statics and to have a lot of glass surface, but not well insulated?)

This is what the construction looks like from the outside. At least the cladding is not a steel support and the bay window is made of reinforced concrete, so that, according to my understanding, the window has no structural function.

Corners are always thermal bridges, but unfortunately, it is not possible to assess whether this is still within the standard or a defect. Furthermore, it naturally depends on the contractually agreed framework conditions (room temperature). According to the standard (DIN 4108-2), with a room temperature of 20°C and an outside temperature of -5°C, a minimum surface temperature of the exterior wall of 12.6°C (inside) is permitted, as otherwise condensation may occur. If no other room temperature has been agreed upon accordingly, it must be assumed, for reasons of thermal protection, that a defect exists at the latest when this limit value is undershot. In terms of thermal protection, it is ultimately irrelevant what material the exterior wall is made of; there are no bonuses or penalties. This limit temperature must be maintained, and if the component itself cannot achieve this, it must be additionally insulated.

Thank you very much for the technical input. Nothing specific was agreed upon. At the mentioned °C values, it could already be tight for me. The pictures were taken at about 20° room temperature and 1-2° outside temperature. That means at -5° outside temperature, the 12.6°C interior wall/window would be exceeded.

Basically, it is much more about whether the image, as it occurs with us, is "normal," or whether there is a need for adjustment and especially options for it.

Sorry, you really can't see much in the pictures. Therefore, precise angle measurements have not reached me. It is "normal" in the sense that outside corners always represent an energetic weak point. If the camera really measures accurately and the temperatures are not maintained, it is not "normal" in terms of standards and also dangerous because with continuous condensation loss, medium to long-term building damage and mold cannot be ruled out.