Now that the temperature outside has dropped, the windows start to accumulate water vapor. I am assuming that it might also lead to that black stuff forming. Is there a more efficient way of dealing with the condensate than wiping it dry every day?
Now that the temperature outside has dropped, the windows start to accumulate water vapor. I am assuming that it might also lead to that black stuff forming. Is there a more efficient way of dealing with the condensate than wiping it dry every day?
Interesting idea. The thermo cam shows a consistent stripe of cool area where the seal sits all around the window. Not sure…
Easiest way to find out: Get some TesaMoll in the right size and try it out on one window.
Ah, my bad. I meant the silicone sealant of the glass pane where it meets the frame. The regular seal - while originally bad - has been fixed already. So it’s really the seal where the glass pane meets the movable window frame, not where the movable frame meets the frame fixed to the walls, if that makes sense.
Yeah, makes sense. That would be unusual. Only thing I could imagine is water entry into the frame, if the outside seal on the glass was bad. The part we can see in the picture looks alright though.
Usually, it’s one of those two white seals that lose proper contact with their counterpart surfaces, either because the wood deforms irregularily (and thus gets bend) or because the whole moving frame needs to be readjusted to close tighter. Bit weird in your case, as you say they are fine. How is the temperature in the middle of the pane?
A picture should explain this better. Middle of the pane is difficult to measure in Infrared, but a regular probe taped to it shows about 18°C right now, so just a bit below room temperature. I assumed this behaviour is normal, since all windows in my rental are like this. Note that this windows specifically has not been resealed at the movable part of the frame yet. However, as you can see, it’s not the coldest point of the entire window either. Outside temperature was -3°C when the photo was taken.
It doesn’t seem, that the movable part of the frame is even that cold. From the scale I’d estimate it at 17°C or so? It really seems that the contact between the frame and the pane is the weak point.
For comparison, I’ve just gone and measured my relatively new windows, about 3 years old, plastic frame. Its -3°C outside as well.
I’ve measured my pane temps by sticking a bit of matte tape to it:
The pane is about 3°C colder than the ceiling and the floor:
In my case, the coldest part is the fixed part of the frame:
The contact area between the pane and the frame doesn’t cool off nearly as much as it does in your case. I guess, that’s your answer regarding the condensation. Not much you can do about that, it seems :/
EDIT: Yeah, I think that is it. Just had a look at how the panes are fitted into my windows: The plastic frame overlaps them AND the pane edges aren’t metal or at least the metal is covered. In your case, the metal frame is isolated from the inside and the outside basically just by a bit of silicone. That’s probably what makes this heat bridge a lot less critical in my case.
Thanks for the feedback! So, bad windows in my case. Either way, badly insulated windows just tend to form condensation it seems.
I guess in the end it’s the usual: Regular short cross-venting and wiping off moisture - or go on an insane money spending spree on insulation and air conditioning.