Hello,

Need some advice on this.

we stay in a high-rise condo, recently we constantly hear some wall knocking sound - as in like someone using a hammer to knock on the wall "dong dong dong..." with a perfect beat!
at 1st we thought is from above unit, but after have a chance to talk to the owner it seems is not coming from them (because when talking to them, I still can hear the sound from my unit, so try to exclude they are the root cause).

the knocking noise happen day and night, usually last like about a minutes, stop.....and perhaps later will come back again in next minutes or hours.

I looked up in google...try to search what can be the sound is, especially now EMCO time no renovation is allowed. The most I can found is this thing call water hammer in the piping system, or pressure hammer.

Anyone has experience this before? we are almost at the edge and need to find what is the source of the sound and have it resolved.

Unlikely - because it really sound like hammer trying to demolish the wall when people doing renovation.
Asked below unit owner - he is not staying and not renting to any one either, is empty unit.
currently under EMCO, no construction works is allowed in the area.

Nope...the furthest from the lift.

is more than 2 times a day.... cannot be you chopping meat at late night or early 7am right...........

ya, most suspected item is the piping.
I've talk to the Management Office and they are going to check any water piping issue in my tower. Hopefully they found the root cause and get it fix.