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?
Hi again,
Not only possible, it’s actually necessary. It’s not exactly a waterproofing membrane but looks similar. The ceilings are not fixed to the walls; they need to be able to move. That’s why this "slip sheet" is used.
Best regards,
Andreas
Musketier schrieb:
I
Could it be that a waterproofing membrane was installed between the masonry and the precast ceiling, which has become slightly softer due to high temperatures and is now showing through the paint?
Not only possible, it’s actually necessary. It’s not exactly a waterproofing membrane but looks similar. The ceilings are not fixed to the walls; they need to be able to move. That’s why this "slip sheet" is used.
Best regards,
Andreas
S
Sebastian795 Jul 2016 11:57I believe that this membrane is not a must-have – and it doesn’t disintegrate or become greasy.
I also think that we don’t have any slip sheets here…
I also think that we don’t have any slip sheets here…
Hi Sebastian,
let’s put it this way: Three independent people told me that a sliding bearing like this is necessary for our house because the clay bricks behave differently during drying and have different thermal expansions compared to the concrete ceilings. That sounds reasonable.
You probably built with sand-lime bricks in Westphalia, so maybe it’s different there?
And perhaps there are other sliding bearing systems besides the foil installed in our case. It’s just a guess what might be used at Musketier...
Best regards,
Andreas
let’s put it this way: Three independent people told me that a sliding bearing like this is necessary for our house because the clay bricks behave differently during drying and have different thermal expansions compared to the concrete ceilings. That sounds reasonable.
You probably built with sand-lime bricks in Westphalia, so maybe it’s different there?
And perhaps there are other sliding bearing systems besides the foil installed in our case. It’s just a guess what might be used at Musketier...
Best regards,
Andreas
