Ventilation system cellar without windows

  • Erstellt am 2022-06-13 13:17:11

Prager91

2022-06-14 09:29:07
  • #1


We already had 70% before starting operation, so shortly before, since the drying was only finished 1 1/2 weeks ago – so everything is still very “fresh”.

We have about 20 degrees in the cellar and, as mentioned, 70% humidity. The ventilation system has been running for 4 days now.

So I’ll probably wait a few more weeks and observe the whole thing to see if the humidity steadily decreases. If that is the case and I get to about 60%, I will probably use the cellar as storage or as a laundry drying room.

Thanks for your help!!
 

WilderSueden

2022-06-14 09:34:26
  • #2
We are now in summer. This means that with air exchange alone you achieve little drying. The temperature differences are too small for that. In the worst case, the relative humidity of the drawn-in air even increases due to the cooling. I would strongly advise against bringing in moisture through laundry. Laundry also dries quickly outside in the sun.
 

Prager91

2022-06-14 09:40:51
  • #3



Yes, I currently have no problem with that in summer - you're right.

I will probably wait and see how the humidity develops in general and then maybe slowly start using the space as storage. As I said, I am under no pressure to do this urgently... However, one wants to use the room as envisioned :)
 

vonBYnachSH

2022-06-14 09:45:05
  • #4
As others have already written: continue drying out the basement. Especially in summer! 70% is too high. We have lived in several newly built houses and in the first one, despite having basement windows and being able to cross-ventilate, we struggled with mildew. Cardboard boxes and their contents started to mold. Why is that not an option for you? Drying devices for "home use" are already available for around €100 and provide great service. If you also want to do laundry, in my opinion, it is a must at the beginning. Also, as already mentioned, in the first years all furniture should stand about 10 cm away from the wall. No paper or leather should be stored.
 

Prager91

2022-06-14 10:15:04
  • #5


Sure, I think that newly built houses are very prone to mold stains, especially since nowadays, unfortunately, it still feels like everyone builds WITHOUT a ventilation system. The "prescribed" 5x cross-ventilation a day can only be done to a limited extent because with 2 full-time jobs, it is simply not possible.

This certainly helps us avoid mold in the first place - provided, of course, that the humidity level is not too high in principle and the building is dry.

As said, I will observe this for the next few weeks, possibly let the summer pass, and then in autumn/winter, I will try storing things in the basement – and possibly dry laundry in the basement for the first time.
 

WilderSueden

2022-06-14 10:30:29
  • #6

The 70% is actually too high and ventilation is useless in summer. You cool 30-degree warm air down to 20 degrees, with correspondingly higher relative humidity. Google a humidity calculator and play around with the numbers a bit, then you'll understand what I mean.
If you want to dry out the basement walls in summer, you have to work with artificial dehumidification, i.e., a construction dryer. I don't understand why you are so stubbornly opposing this now. The result of waiting is completely predictable. You can do that in winter (when ventilation actually dehumidifies), but not in summer (when the opposite tends to happen).
 

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