Hello,
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We bought an older house built in 1971 about 7 years ago. At that time, the bedroom ceiling was repainted and the walls were wallpapered.
Over the years, we have noticed some fogging – meaning the walls have become slightly darker. The painter plans to repaint them again this summer.
Our flat roof was renovated 12 months ago.
Inside, there were never any signs of damp spots, but on the outside, just below the gutter, we could see concrete drips through the plaster, which is why we decided to renovate it.
Now, by chance due to a new lamp, I have noticed light spots on the bedroom ceiling. When I tap on them, they sound hollow. In the bedroom, I find about 7 of these spots spread over 15 sqm (160 sq ft) – each no larger than the width of a hand and scattered. In the other rooms upstairs, we do not have this fogging issue; the ceilings there still look freshly painted. However, even there, when tapping, I can occasionally find a few small hollow spots by chance.
There are no cracks or dark discolorations anywhere on the upper floor.
Could it theoretically be that the roof was more leaky than we thought, causing the reinforcement in the concrete to rust and therefore the plaster to sound hollow in small areas? Or is it more likely just a harmless cause such as old plaster, poor adhesion, or something similar?
I hope it is the latter, because otherwise, we would expect not only small hollow spots but rather longer, larger areas and also cracks in the plaster in these spots, right?
Pictures are really difficult to capture; even in person, you only notice the spots when looking closely.
If this is the wrong section, please move it!
We bought an older house built in 1971 about 7 years ago. At that time, the bedroom ceiling was repainted and the walls were wallpapered.
Over the years, we have noticed some fogging – meaning the walls have become slightly darker. The painter plans to repaint them again this summer.
Our flat roof was renovated 12 months ago.
Inside, there were never any signs of damp spots, but on the outside, just below the gutter, we could see concrete drips through the plaster, which is why we decided to renovate it.
Now, by chance due to a new lamp, I have noticed light spots on the bedroom ceiling. When I tap on them, they sound hollow. In the bedroom, I find about 7 of these spots spread over 15 sqm (160 sq ft) – each no larger than the width of a hand and scattered. In the other rooms upstairs, we do not have this fogging issue; the ceilings there still look freshly painted. However, even there, when tapping, I can occasionally find a few small hollow spots by chance.
There are no cracks or dark discolorations anywhere on the upper floor.
Could it theoretically be that the roof was more leaky than we thought, causing the reinforcement in the concrete to rust and therefore the plaster to sound hollow in small areas? Or is it more likely just a harmless cause such as old plaster, poor adhesion, or something similar?
I hope it is the latter, because otherwise, we would expect not only small hollow spots but rather longer, larger areas and also cracks in the plaster in these spots, right?
Pictures are really difficult to capture; even in person, you only notice the spots when looking closely.
Nida35a schrieb:
Are there any examples, maybe previous spots? No, but my main concern is whether it could be something more serious like rusting reinforcement or just a cosmetic issue? I think it’s probably not spots since there are too many of them 😉
Nida35a schrieb:
Rust is brown, and I only believe it when the stains are brown.
You yourself say it’s barely visible and the plaster is solid, only sounding hollow.
It seems like holes were patched during drywall or painting work.
What was the room used for before? Unfortunately, I don’t know.
If the reinforcement were corroded, I would probably expect at least cracks in the plaster, if not even chipping, right?
There will be some filler spots that have not been perfectly sanded smooth.
Please note, I am not an expert and not on site. But based on your description, including the tapping sound, that would be my guess.
You can always ask the painter when they come for the painting...
Please note, I am not an expert and not on site. But based on your description, including the tapping sound, that would be my guess.
You can always ask the painter when they come for the painting...
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