Partial ETICS with new windows

Hello everyone,

we will soon be renovating part of our detached house. In the process, windows also need to be installed in this part since the rooms are being rearranged and old windows are being bricked up.

Now the question arises whether we should choose double-glazed windows or triple-glazed windows. We are aware that triple glazing is usually more efficient. Our main concern with this question is whether "too tight windows" could possibly lead to thermal bridges and mold growth, for example if the windows are tighter than the masonry. Furthermore, I have already heard from acquaintances that the windows fog up very quickly and form moisture compared to the more permeable double-glazed windows.

Our house was built in 1995 and the previous windows are double-glazed plastic windows. According to the construction description, there is 0.06 m of rock wool insulation on a 0.24 m limestone sand brick wall. The U-value (thermal transmittance coefficient) is therefore 0.48 W/m²K.

What I must add: due to the renovation work, the facade in the affected areas will be redone and a thermal insulation composite system with a plaster facade will be installed in front of the existing clinker brick. Thus, much better insulation is present in these areas. Only in this part (kitchen and living/dining area on the ground floor) will the windows be renewed. Do you see any problems here, since there is now partially better insulation?

Thank you for your help and best regards!

Now the question arises whether we should choose double-glazed windows or triple-glazed windows. We are aware that triple glazing is generally more efficient. Our main concern with the question is whether "too tight windows" could possibly lead to thermal bridges and mold growth, for example, if the windows are tighter than the masonry. Furthermore, I have already heard from acquaintances that the windows fog up and form moisture very quickly compared to the more permeable double-glazed windows.

The question does not arise. You answered it in the first two sentences. Tight windows. Hmm. Actually, all windows are equally tight. They are only installed more or less tightly. However, normal and proper installation today means that ALL windows are installed airtight. Regardless of whether they are single, double, triple, or quadruple glazed. Regardless of whether they are single or double casement. Etc. What exactly did your acquaintances say? Triple glazing fogs up quickly from the inside? Then go to a lawyer because defective windows were installed. Fogging from the outside? That is normal and a good sign. I had that just this morning. The windows let so little heat pass through the panes that the outermost pane can cool down so much that moisture condenses. And finally: If mold and moisture form somewhere in the apartment, in 95-98% of all cases it is due to the residents and not the windows. Ventilation and heating are the magic words. P.S. Windows tighter than masonry? What nonsense. As if the masonry were not tight. No air passes through anywhere, breathable walls are a myth.