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Hauslebauer9332 Dec 2023 16:51Hello,
we are having problems with the windows and don’t know what to do anymore. We are tenants, and our landlord has reminded us several times to ventilate the rooms. We air out the apartment twice a day for 5 minutes, even in winter. We have been living in the apartment for 1 year, and the windows are about 20 years old.
Where is the water coming from? We have slight condensation on the glass, which is normal. However, the water appears at the window frame and runs down.
The window installer has already replaced the fittings and seals (we do not know exactly which ones).

we are having problems with the windows and don’t know what to do anymore. We are tenants, and our landlord has reminded us several times to ventilate the rooms. We air out the apartment twice a day for 5 minutes, even in winter. We have been living in the apartment for 1 year, and the windows are about 20 years old.
Where is the water coming from? We have slight condensation on the glass, which is normal. However, the water appears at the window frame and runs down.
The window installer has already replaced the fittings and seals (we do not know exactly which ones).
Classic case: Tenant reports mold, landlord blames incorrect ventilation. Honestly, this damage pattern looks like faulty connection or thermal bridge. I would recommend: joining the tenant association, seeking legal advice, ordering an expert assessment, and putting pressure on the landlord!
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Benutzer 10013 Dec 2023 06:08HausiKlausi schrieb:
Classic case: Tenant reports mold, landlord blames incorrect ventilation. Honestly, this damage pattern looks like a faulty connection or thermal bridge. My advice: join the tenants' association, seek legal advice, hire an expert, and hold the landlord accountable! What you notice…
Regarding this topic, I wonder: do you use a humidity meter?
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WilderSueden3 Dec 2023 18:15Hauslebauer933 schrieb:
We ventilate twice a day for 5 minutes, even in winter. Typically, disputes assume ventilation 3-4 times a day. With only twice, your chances are low.
My advice: the seals are old and brittle. Because of this, quite a bit of warm, moist air escapes through the seals and condenses in the frame. Regardless, you should ventilate more often and possibly also increase heating. Condensation on windows is common in older buildings, but it’s always a sign that the situation is critical and condensation can also occur on the walls.
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Hauslebauer9333 Dec 2023 20:54WilderSueden schrieb:
Usually, in case of issues, airing out the rooms 3-4 times is expected. Twice is not enough.
My advice: the seals are old and brittle. This allows a significant amount of warm, moist air to escape through the seals and condense in the frame. Regardless, you should ventilate more often and possibly increase heating. Condensation on windows is common in older buildings but always a sign that the situation is critical and condensation could also form on the walls. I need to discuss the topic of airing out four times, as we measure the humidity and it stays mostly around 60%. Temperatures are between 21-22°C (70-72°F) in all rooms (my partner feels cold easily and finds it warm).
What I still don’t understand is the amount of water inside the window frame, which then runs inward. There could be two causes: water entering from the outside, or warm air escaping and condensing.
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