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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BookstarHello 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.
I’m not very familiar with this, but I’m sure experts like @11ant can provide some insight. However, I agree that if the issue only occurs with four windows, there must be something different about them.
A small anecdote related to this: I store sparkling water on the balcony during winter. Since the long period of -10°C (14°F) night temperatures, it tends to freeze occasionally. Interestingly, not every bottle in a six-pack freezes. It’s also not related to their proximity to the living room wall. I assume some bottles are simply tighter sealed than others, which causes them to freeze later...
A small anecdote related to this: I store sparkling water on the balcony during winter. Since the long period of -10°C (14°F) night temperatures, it tends to freeze occasionally. Interestingly, not every bottle in a six-pack freezes. It’s also not related to their proximity to the living room wall. I assume some bottles are simply tighter sealed than others, which causes them to freeze later...
Hello,
have you measured the temperatures of the panes? If the gas filling in the panes is not intact (or their sealing is compromised), the windows may provide poorer insulation.
It could also be that the humidity in these rooms is somewhat higher than in the others. We also have a controlled ventilation system, and a few percentage points difference in humidity can occur.
Or the wind is directly hitting the windows, and due to wind chill, it can feel much colder outside than -15°C (5°F).
Best regards,
Andreas
have you measured the temperatures of the panes? If the gas filling in the panes is not intact (or their sealing is compromised), the windows may provide poorer insulation.
It could also be that the humidity in these rooms is somewhat higher than in the others. We also have a controlled ventilation system, and a few percentage points difference in humidity can occur.
Or the wind is directly hitting the windows, and due to wind chill, it can feel much colder outside than -15°C (5°F).
Best regards,
Andreas
Is the pleated blind always fully closed at the bottom? In our old apartment, we had condensation behind the pleated blinds on the roof windows in the bathroom. We then always left a gap open at the bottom, which helped.
But whether this is acceptable with new triple-glazed windows, I have no idea... it also seems odd to me, as we haven’t encountered this issue anywhere else so far.
But whether this is acceptable with new triple-glazed windows, I have no idea... it also seems odd to me, as we haven’t encountered this issue anywhere else so far.
Schimi179111 Feb 2021 10:28Bookstar schrieb:
...
A few windows have developed condensation on the inside at the lower corners,
...I noticed the same with two small windows in our house yesterday when it was below -20°C (-4°F). These windows are in storage rooms that are not heated, and there are refrigerators standing below the windows...Coincidence?
Today, there is nothing noticeable.
Bookstar schrieb:
A few windows have condensation on the inside at the lower corners, [...] Is this a defect, or is it unavoidable given the outside temperatures and therefore acceptable? I’m surprised that out of 20 windows, only 4 are affected. Personally, I also find that when you touch the corner with your finger, you can almost feel cold air coming through the seal.
Would it be reasonable to request a glass replacement from the window supplier? From what I understand in the photo, "inside" here refers only to the room side of the glass, not inside the glazing unit. So, no glass replacement. But probably a seal replacement: it looks like the seals in the corners are not miter cut, but bent. I wouldn’t rule out calling it a defect in this case. It’s always a relief to see other window manufacturers working as “pragmatically” as “my” guys used to ;-)
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