ᐅ Humidity in the Bathroom

Created on: 26 May 2015 12:25
F
f-pNo
Hello everyone,

We have been living in our own home for six months now.
At the moment, there is something that worries me a little because I don’t know if it is normal or not.

Since we moved in, we have had a humidity meter in the main bathroom. I check it regularly. When the humidity is above 60%, I open the window (whenever I am home) to reduce the moisture.
During the winter months, I lowered the humidity to around 50% (10 inches) and it generally stayed there until someone took a shower or bath. After that, I would open the window again and everything was fine.

Currently, however, I notice that despite leaving the window open for a long time at times, I can hardly get the humidity below 55%, and – what worries me even more – the humidity rises continuously again after closing the window, even though no moisture is being added (no showering or bathing). This morning, the reading was 75%.

Sometimes I can explain this: for example, warm air (in summer) holds moisture less effectively than cold air (winter), which may be why it is harder to get the humidity below 55% currently.
But why does the humidity continuously increase again when the window is closed, even though it stayed consistently low during the winter months? The only idea I have is that with the current temperatures, the walls are warmer than in winter, which causes more residual moisture to be released and enter the room.

PS: There is actually an extractor fan in the bathroom that is supposed to turn on at high humidity levels. However, it has never worked properly from the beginning (and the electrician has not found the fault – the control unit has already been replaced three times). Therefore, we still mainly rely on window ventilation.
f-pNo27 May 2015 10:25
Doc.Schnaggls schrieb:
I’m curious to see what comes of it.

Do you happen to have a special plaster or wallpaper in the bathroom that can help regulate humidity?

We used a textured plaster from Baumit (I would need to check the exact type with @home). We generally applied it throughout the house — hallway, corridor, stairwell, as well as the bathroom and shower area (above the tiles).
f-pNo30 May 2015 22:30
Doc.Schnaggls schrieb:
Then I'm curious to see the results.

Do you have a special plaster or wallpaper in the bathroom that might help regulate humidity?
I checked again today; it is "Baumit disc plaster SEP 01 white".