Constant squeaking in the flat

Hey,

For the past few weeks, I have been hearing a squeaking sound in my flat, coming from the corner of the flat(top corner). On the other side of the wall is the bathroom. I would like to add that I hear it not only me, but also my roommate and my girlfriend. Disconnecting the electricity in the flat did not help. I live on the 10th floor of an 11-storey block of flats made of large slabs, above the top floor there is also such a passage to other staircases and there are probably some rooms there too(I live in the middle one). The beeping starts quite randomly throughout the day for a few tens of minutes at a time, but it always starts to howl after midnight and so squeaks with small breaks until morning. First you hear a quiet squeal as if someone had switched something on, and then like a drill under load. Completely unsure what it is, the squeal is fairly quiet, but at night when it is quiet it is unbearable. In addition, it can be heard in the stairwell, most notably in the middle of the corridor at the very top of the block. The problem is that as I move from one cage to another there, the sound goes quiet and it's completely impossible to sense the source. Maybe something on the roof? I've tried to reach the neighbours above us but there doesn't seem to be anyone there, I plan to walk around the other flats today and ask around, but maybe someone has encountered something like this. Administration not very helpful either, besides it's hard to hit a moment during the day when it squeaks. I checked other topics but that didn't help. If anyone has encountered something like this or has any ideas, please help. I am attaching the audio file, I have bumped it up a bit in audacity.

Wind, draughts?

How about a roof fan?
http://www.forumbudowlane.pl/wentylacja-i-klimatyzacja/blok-buczaca-wentylacja-t60923

Greetings.

Lightning protection wires on roofs can play like guitar strings - under the influence of the wind, of course. I used to live in one flat where it howled like some ghosts in a castle - I got used to it - I had such an acoustic wind meter .

So squeaks poverty And seriously , since it's around the bathroom , maybe the water flow in the pipes ? It's still too early for the water in the central heating system (heating season) but the DHW system ? Some kind of pumps to assist the circulation of domestic water ? Maybe when there is consumption by the inhabitants of a block of flats there is no need to make forced circulation, but in order to have hot water in the morning, maybe they switch on at night? But you would have to ask the building administration

central heating vent?
ultrasonic insect repellent?

Thanks for the tips. After talking to my neighbours I have been able to establish that the sound is only in my riser, from the 7th to the top floor, plus the squeaking has been getting stronger for a while. The central heating started up a week ago and the squeaking has been going on for over 2 msc. so I don't think it's that.
Unfortunately, the estate administration doesn't want to send a technician at night (that's when the squealing goes on all the time), so I'll have to contact them directly and probably make an arrangement.
Generally, if it doesn't work out with the estate technician, I don't really know who I could call to avoid spending money on everyone but the removal company. Someone to do the electrics, gas, water? Is there a profession that deals with things like locating the source of a strange sound? .

blackigel wrote:

Is there a profession that deals with things like locating the source of a strange sound?

Acoustic. .