Hello everyone,
I have a question as well.
In our utility room, there is a small area about 5cm (2 inches) long in the corner between the exterior wall and the concrete ceiling where the white paint has suddenly turned dark and is slightly peeling. Behind it, there is a sticky black substance. If you scrape it a bit, it is malleable like bitumen/tar. Above this spot is the bathroom with the toilet cistern. My memory is a bit rusty after two years, but as far as I know, there were no bituminous membranes on the upper floor.
However, it’s possible that this was already present when the painting was done, and I may have painted over it without noticing. What surprises me is that it is now suddenly showing through as black and appears to have slightly spread.
Does anyone have an idea if bitumen/tar is commonly used for sealing in this situation, and if it is normal for it to become a bit soft again over time?
I have a question as well.
In our utility room, there is a small area about 5cm (2 inches) long in the corner between the exterior wall and the concrete ceiling where the white paint has suddenly turned dark and is slightly peeling. Behind it, there is a sticky black substance. If you scrape it a bit, it is malleable like bitumen/tar. Above this spot is the bathroom with the toilet cistern. My memory is a bit rusty after two years, but as far as I know, there were no bituminous membranes on the upper floor.
However, it’s possible that this was already present when the painting was done, and I may have painted over it without noticing. What surprises me is that it is now suddenly showing through as black and appears to have slightly spread.
Does anyone have an idea if bitumen/tar is commonly used for sealing in this situation, and if it is normal for it to become a bit soft again over time?
B
Bauexperte6 Jul 2016 10:36Musketier schrieb:
I think so. I have little to no experience with this type of ceiling, so I can only offer very basic assistance at best; sorry.
From what I gathered in the installation video (Aunt Google), hollow-core slabs are installed without sound insulation. Hopefully, your supplier considered this and laid roofing felt as a cap on the wall plate. This material could have then been installed somewhat poorly in the airtightness layer and subsequently shifted.
However, that's a lot of speculation for me. Since you are, due to the facade work, in contact with your supplier, ask them whether the row of blocks below the hollow-core slab includes sound insulation. Only by doing this can you narrow down the cause through a process of elimination. If they confirm this, even better; then you most likely have the means to reassure your wife.
Regards, Bauexperte
Bauexperte schrieb:
For me, that’s a bit too much speculation. Since you’re already involved with the facade work and in contact with your supplier, ask them if they have installed soundproofing beneath the hollow ceiling where the row of stones is. This is the only way to systematically identify the cause by ruling out possibilities. If they confirm this, even better; then you’ll very likely have the solution to calm your wife down. Thanks. I’ll clarify this with the site manager.
By the way, the finishing plaster will be applied next Monday or Tuesday, so hopefully this issue will be resolved then.
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