Hi,
I need some advice. In our house (3 years old, solid construction, 36.5cm (14 inches) Poroton blocks), there is mold forming in one room at the corner where two walls (both exterior walls) and the ceiling (upper floor under the flat roof) meet. There is no mold anywhere else in the house, and we ventilate the room daily.
I had the roofer check the site, and they removed the roof down to the concrete layer, but everything is dry there.
Now we’re really stuck... Everyone is puzzled. What could be causing this problem?
Thank you and best regards
I need some advice. In our house (3 years old, solid construction, 36.5cm (14 inches) Poroton blocks), there is mold forming in one room at the corner where two walls (both exterior walls) and the ceiling (upper floor under the flat roof) meet. There is no mold anywhere else in the house, and we ventilate the room daily.
I had the roofer check the site, and they removed the roof down to the concrete layer, but everything is dry there.
Now we’re really stuck... Everyone is puzzled. What could be causing this problem?
Thank you and best regards
It is more likely that simply not enough ventilation is provided. If there is no controlled residential ventilation system or purely mechanical solution such as trickle vents, airing the room once a day is far from sufficient... Nowadays, all houses are airtight. During the heating season, indoor humidity does not decrease compared to summer,... If the house is occupied without regular ventilation, the humidity will also increase...
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nordanney20 Nov 2019 22:27Pluto1977 schrieb:
2. I just measured the temperature on the wall. It is 2 degrees cooler (17.2°C (63°F) compared to 19.3°C (66.7°F)) than in other areas. How a thermal bridge could form there, I don’t know, but I’m not an expert.I recently had the same issue in an apartment (not my own). The corner was simply colder, which caused mold. You can ventilate all you want, but it doesn’t help. The insulation is somehow insufficient there, for whatever reason = thermal bridge. Possible solution: Insulate the inner corner with calcium silicate boards. That should prevent mold from forming.
I also find 19.3°C (66.7°F) feels quite low. We always ventilated the apartment well, but last year we tried to start the heating season at the beginning of November. And suddenly, due to heating too late, mold or mildew appeared on the roller shutter box, whatever you want to call it. Heating too little is just as bad as ventilating too little. After we removed the stains and heated properly, everything was fine again.
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