Hello.
I am new to the forum, have never built a house, and do not plan to. I am a tenant in a three-room apartment with a bathroom and kitchen on the ground floor of a four-family house, and I still hope to find support in this forum.
To explain my situation, I would like to provide some details.
The house was built between April and August 2011 and was occupied from September 15, 2011. It stands without a basement on a slab foundation, and the exterior walls are made of 36.5 cm (14 inches) aerated concrete. All rooms have underfloor heating. The windows have roller shutters with internal boxes. All rooms were heated intensively about one week before moving in. Then, throughout autumn, winter, and spring, all rooms were ventilated by fully opening the windows for 30 to 60 minutes twice a day.
Now to the actual problem. To this day, there is a high indoor humidity level, mostly above 60%, especially in the bedroom (which has two exterior walls facing north and east). Mold has appeared in the corners of these exterior walls. The bedroom window is kept closed overnight. However, the bathroom window is tilted open, and the doors of the two adjacent rooms at a 90-degree angle to each other are left open. It should also be noted that the apartment was hardly used from May to August (so no moisture generated from occupancy), but it was still ventilated at least once a week for at least 30 minutes by fully opening the windows.
Currently (for the past five days), I have been using an electric dehumidifier in the bedroom. It can extract about 1.5 liters (3.2 pints) of water from the air within 12 hours. In these five days, it has removed more than 7 liters (7.4 quarts)! By the way, a construction dryer was already used in 2011 for about three weeks in November, which extracted 140 liters (148 quarts) of water from the bedroom alone.
Is it possible that the original construction moisture was not fully removed, or that moisture is entering the apartment afterwards from somewhere?
Now, my questions to experienced construction professionals:
Who can provide advice that I can use in discussions with the landlord, who is also the owner and developer of the apartment in question?
I am new to the forum, have never built a house, and do not plan to. I am a tenant in a three-room apartment with a bathroom and kitchen on the ground floor of a four-family house, and I still hope to find support in this forum.
To explain my situation, I would like to provide some details.
The house was built between April and August 2011 and was occupied from September 15, 2011. It stands without a basement on a slab foundation, and the exterior walls are made of 36.5 cm (14 inches) aerated concrete. All rooms have underfloor heating. The windows have roller shutters with internal boxes. All rooms were heated intensively about one week before moving in. Then, throughout autumn, winter, and spring, all rooms were ventilated by fully opening the windows for 30 to 60 minutes twice a day.
Now to the actual problem. To this day, there is a high indoor humidity level, mostly above 60%, especially in the bedroom (which has two exterior walls facing north and east). Mold has appeared in the corners of these exterior walls. The bedroom window is kept closed overnight. However, the bathroom window is tilted open, and the doors of the two adjacent rooms at a 90-degree angle to each other are left open. It should also be noted that the apartment was hardly used from May to August (so no moisture generated from occupancy), but it was still ventilated at least once a week for at least 30 minutes by fully opening the windows.
Currently (for the past five days), I have been using an electric dehumidifier in the bedroom. It can extract about 1.5 liters (3.2 pints) of water from the air within 12 hours. In these five days, it has removed more than 7 liters (7.4 quarts)! By the way, a construction dryer was already used in 2011 for about three weeks in November, which extracted 140 liters (148 quarts) of water from the bedroom alone.
Is it possible that the original construction moisture was not fully removed, or that moisture is entering the apartment afterwards from somewhere?
Now, my questions to experienced construction professionals:
- Why do I still have such high humidity in the apartment more than three years after construction? What could have gone wrong?
- Can the installation of passive ventilation elements (no active air exchange systems, etc.) in the windows provide a permanent solution? I found two options. The first is ventilation slots installed in the window frames (Sonoslot by Renson). The second is supply air elements placed in the roller shutter boxes (ZWRH 30 by AERCO or TRANSIVENT by Renson).
Who can provide advice that I can use in discussions with the landlord, who is also the owner and developer of the apartment in question?
B
Bauexperte23 Oct 2014 16:58Hello,
Best regards, Bauexperte
baugori schrieb:Only an expert who can inspect the apartment together with you and the owner can help. Anything else is nonsense and it would be irresponsible to give you advice otherwise.
Who can give me advice on how I can confront the landlord, who is also the owner and builder of the apartment in question?
Best regards, Bauexperte
schubert7927 Oct 2014 18:1560% humidity in the current weather conditions (we have constant fog) is not unusual...
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