ᐅ Aluminum-wood windows with triple glazing showing interior condensation despite warm edge spacer
Created on: 11 Feb 2021 09:10
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Hello everyone,
As some of you may have noticed, I am currently paying closer attention to details, and today, at -15°C (5°F), something caught my eye.
A few windows have developed condensation on the inside at the lower corners, despite low indoor humidity of 40% and a controlled ventilation system.
The windows are aluminum-wood, triple-glazed with warm edge spacers, part of a KFW55 energy-efficient house.
Is this considered a defect, or is it unavoidable and acceptable at these outdoor temperatures? I find it surprising that only 4 out of 20 windows are affected. Personally, when touching the corner, you can almost feel cold air coming through the seal.
Would it be reasonable to request a glass pane replacement from the window supplier?
I have attached a picture for you.
As some of you may have noticed, I am currently paying closer attention to details, and today, at -15°C (5°F), something caught my eye.
A few windows have developed condensation on the inside at the lower corners, despite low indoor humidity of 40% and a controlled ventilation system.
The windows are aluminum-wood, triple-glazed with warm edge spacers, part of a KFW55 energy-efficient house.
Is this considered a defect, or is it unavoidable and acceptable at these outdoor temperatures? I find it surprising that only 4 out of 20 windows are affected. Personally, when touching the corner, you can almost feel cold air coming through the seal.
Would it be reasonable to request a glass pane replacement from the window supplier?
I have attached a picture for you.
Schimi179112 Feb 2021 07:22guckuck2 schrieb:
...
I’ve noticed another effect.
I found a window at my place that is fogged on the outside along the lower half. The condensation can be wiped away, but it reappears shortly after. It only affects one pane out of 11 on that building side (east). This happens at temperatures between -5 and -15 degrees Celsius (23 and 5 degrees Fahrenheit).
I’ve been wondering how to explain this. Is the heating pattern in that room with the window different?
Schimi1791 schrieb:
Is the heating behavior in this room different with the window?No, about 21.5–22.0°C (71–72°F) and the window has two sashes; only one is affected.
Schimi179116 Feb 2021 21:26Are you accepting the condensation on the windows now? Unfortunately, I forgot to ask the carpenter who installed the windows when he was here again today for the new front door. But I will follow up on that. I need to call him tomorrow or the day after anyway. I assume that even modern windows will show some weaknesses at significantly subzero temperatures. The window is probably still the coldest spot in the (modern) wall, right? Especially when there is increased humidity involved...
HausiKlausi17 Feb 2021 21:33Schimi1791 schrieb:
The window is probably still the coldest spot in the (modern) wall, right? Especially if there is also increased humidity ...That would be my explanation as well. Even with triple glazing, you can expect that with a temperature difference of 35 degrees Celsius (outside -15°C (5°F), inside +20°C (68°F)) physics cannot be defied.
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