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PostPosted: Mon Sep 25, 2017 1:45 pm 
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Hi there!
We need some help to identify a low hum / buzz thought the party wall of our victorian property. We have just moved in to a 1-bed first floor conversion, with one flat below and 2 flats adjacent to us. The noise is a low hum which seems to originate in the party wall in the lounge near to the bay window (front of property). The noise carries along the wall through the back room (bedroom) and its feels like the whole property is humming / vibrating. While this noise is not extremely loud, it is persistent and very annoying. Generally seems start at around 7:30am each day and is on and off throughout the day, sometimes up until midnight. Often the noise continues for periods of around 30 minutes at a time, stopping for a couple of minutes, before starting up again. We have spoken to the neighbour in the upstairs adjacent flat, and he does not have any equipment or system running that could cause this noise, but he can hear the same buzz in the wall (we thought it was coming from his side, and he thought it was coming from ours!) Both upstairs flats have the boiler situated at the opposite end to the noise (back of the house) so we don't think it can be this. Both downstairs neighbours say they can not hear the hum, so it appears only to be affecting the upstairs flats.
We don't think it's a fan in the bathroom (which has been suggested) as the bathroom is at the opposite end of both flats to where the noise is heard.
Please help! Is an electrician the best person to assess the noise and find the source? Or should we be looking for someone else? Any advice would be greatly appreciated as we are reaching the end of our tether!


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PostPosted: Mon Sep 25, 2017 2:07 pm 
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I would start by a diagnostic approach.

Turn off your mains electric -see if it stops

Turn off your neighbours

etc

not easy if its intermittent, but you could turn off yours when its happening.

it could be anywhere in the party wall, I would check the layout from basement to roof.


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PostPosted: Mon Sep 25, 2017 4:34 pm 
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:withstupid:

That's all you can do is just try and track it down.

If turning off the electric stops the noise, it's just a matter of turning off individual items until the problem is identified.

Make a list of everything powered by electrickery and turn/tick them off one at a time - liaise with your neighbour at the same time.

Is anything set to turn on at 7.30am (or maybe a little sooner).

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PostPosted: Mon Sep 25, 2017 4:43 pm 
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A friend had a similar problem and I indentified that a fridge was pushed too far back and the vibration from the motor running was being transmitted into the wall. We edged it back a bit and the noise stopped.

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PostPosted: Mon Sep 25, 2017 6:07 pm 
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An old article, but it might be "The Hum" that a lot of people seem to be plagued with.
http://ind.pn/2ftt0lA


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PostPosted: Mon Sep 25, 2017 6:20 pm 
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Dave54 wrote:
An old article, but it might be "The Hum" that a lot of people seem to be plagued with.
http://ind.pn/2ftt0lA


Unlikely if the neighbour has the same hum.

@ OP can you record the sound (video with audio might be possible) Might be water related rather than electrical...

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PostPosted: Mon Sep 25, 2017 6:26 pm 
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@ Ceepank one thread per topic please. I have deleted the post in general diy. If you would like the thread moved then use the alert moderator button (exclamation mark) bottom right of the post/s.


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PostPosted: Wed Sep 27, 2017 12:09 am 
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I had some work done where I worked and returned to a hum, on investigation I found they had drilled multi holes in a steel box and taken each phase through a different hole, they had to return to correct, you say flat so supply could enter a steel box through independent holes, however no load and no hum, unlikely enough load at midnight.

However if caused by electric it will likely be at 50 Hz.
Quote:
A sound engineer should know the following: The AC hum of 50 Hz in Europe is close to the pitch of G1 = 48.99 Hz (49 Hz). The AC hum of 60 Hz in the U.S. is a minor third higher close to the pitch of A#1/Bb1 = 58.27 Hz (58 Hz). So you can find out logically, whether a sound recording was made in Europe or in the U.S.


So the question has to be, is the hum at 50 Hz, if it is then likely electric, if not likely something else.


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PostPosted: Wed Sep 27, 2017 1:12 am 
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the people next door to me use a fan heater
on there side they hear the fan on my side i hear the vibration
i would be asking who gets up about the time the noise starts

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