The craftsman plastered the basement wall and when it dried, cracks appeared and it sounds hollow. Now they are making a hole and filling it with silicone.
Is that right?
 
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Hammarfall
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Sure that it's silicone they're filling with? That sounds strange.
 
Two tubes: one of construction adhesive labeled "Illbruck PL600," and another of construction silicone labeled "Casco.
 
Rabbithole Johannes Carlsson said:
Sure it's silicone they're filling with? That sounds strange
They made a hole where it sounded hollow and filled it in.
 
Hmm clearly strange. It's probably not a problem but I wouldn't choose silicone there if I did the job.
 
Mikael_L
Just a tip, I actually had a hard time understanding what you wrote, I had to read it several times.

Everywhere you've written "dem" it should have been "de".

If you're very unsure about "de" and "dem," switch to colloquial language and write "dom" for both, it usually makes it easier to read, as it becomes like listening then.


And regarding your question.
I assume it is plastered with something cement-based, then no silicone or glue products are compatible.
Tell them they must tear down the plaster where they have gotten voids and replaster, you will not pay for a job that you have to redo later, to have it professionally done.
And if they use silicone, it becomes more difficult to fix, nothing adheres where silicone has been nearby, so then it will be necessary to knock off even more plaster and possibly tear off the stone/concrete underneath as well.
 
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Sthlm1891 and 3 others
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Who is this guy you've hired?
 
Mikael_L Mikael_L said:
Say that they have to tear down the render where they've gotten hollow spots and reapply it; you won't pay for a job that you have to redo later to have it done professionally.
If it's an older house with wood wool insulation in the basement, it sounds hollow under the render, just as a note. PL600 is an adhesive, not silicone, but regardless, it sounds strange what they're up to.
 
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Mikael_L and 1 other
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If I had decided to press something into a basement wall, it would probably have been foam sealant.
 
Make sure they don't seal with Rhoca-Gil, it can have unpleasant consequences ;)
 
Thank you for your comments.
I have now also talked to advisors at villaägarna and heard the same thing that it is not right.
The plaster should be scraped down and redone with netting behind (anchoring).
 
Mikael_L
The only thing to consider first is what AndersS wrote, that there is a basis for plaster that in itself gives a hollow sound, even with properly applied plaster. But on concrete, concrete blocks, Leca, and many other bases, it should not sound hollow when you tap.
 
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