I have this really annoying ticking noise inside my wall and wondering if anyone could help me?
It's happening inside a top floor apartment.
From what I can tell:
1. Happens on an internal wall close to where the sewerage aeration pipe is (but it doesn't appear to come from it)
2. Happens throughout the daylight hours but not much at night
3. Doesn't seem to be electrical as I've switched off power to the entire lot and the sound keeps going
4. Doesn't seem to be plumbing as I don't think there are any water pipes in that wall
5. HVAC is switched off and no ducts are in that wall
I've attached a video showing the ticking where it's loudest by putting a phone camera into a power point hole.
https://1drv.ms/v/s!AvmFjt08wu3Rgswieq-7svmb0vqrPA