Ask a questionQuestion?

ᐅ Mold inside a 3-year-old house at the wall/ceiling corner

Created on: 20 Nov 2019 16:18
P
Pluto1977
Original post
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
Mycraft21 Nov 2019 11:23
#31
Most likely, there is no construction defect.
W
WingVII21 Nov 2019 12:40
#32
It is standard practice for the planner/architect to develop a ventilation concept according to DIN 1946-6. If no one has informed you about this or if it has not been done, this can indeed be considered a construction defect.
A
apokolok21 Nov 2019 14:36
#33
You mean they should have told him to air out the house five times a day?
And because they didn’t do that, it’s a CONSTRUCTION DEFECT?
No way.
M
Mottenhausen26 Nov 2019 21:51
#34
It needs to be repainted anyway because of the stains, so take the opportunity to insulate the two exterior walls beforehand with gypsum board and expanded polystyrene composite panels, then fill and finally paint. The additional insulation will reliably solve the problem once and for all.
N
nordanney26 Nov 2019 23:30
#35
Mottenhausen schrieb:

insulate the 2 exterior walls with gypsum plasterboard and polystyrene composite panels,
a: wrong material
b: the entire wall? Why?
Mycraft27 Nov 2019 13:55
#36
It is quite possible (most likely even) that this is a heating/ventilation issue. I think it is premature to start using insulation wedges already.

And if necessary, (most likely here as well) insulation wedges would be sufficient.