how to fix noisy water flow in pipes in stack and wall??

Acoustic insulation ?

Is it something new or has it always been there ?

block walls, concrete floors, not easy to put in insulation.
has it always been there? not sure. other units in the building dont suffer from this noise like this stack does.

Is it only one shower that creates the problem or both showers on 2nd 3rd floors?
If it’s just one check the washers / taps on that shower.

You specifically mention shower but I assume that the water supply would also feed other taps in the apartment so what happens if you use other taps ?

yeah other taps in the same bathroom make the noise when turned on as well, dont know about the unit under it

Check for any shutoff valve or flow restrictors, anything that could potentially restrict free flow.

none, straight up the stack thats 3/4" into the unit shut off that i have tried in various positions and still make same noise

So is it common supply to all floors with shutoffs at each level.

Originally Posted by droog

So is it common supply to all floors with shutoffs at each level.

yes

But only an issue if level 3 is running water.
Sorry I am out of ideas.


Edit: Maybe swap the tenants between the units ;-)

Is the 3/4 hard saddled. Isolating the fix off may help.

Originally Posted by phild01

Is the 3/4 hard saddled. Isolating the fix off may help.

no idea its in a gyprocked stack.

Originally Posted by wozzzzza

no idea its in a gyprocked stack.

If you can't access the source of the noise I don't know how you will isolate it.

Originally Posted by wozzzzza

no idea its in a gyprocked stack.

If you cannot see it then you cannot be sure that there are no flow restrictors or other devices producing the noise.
Use a stethoscope to pinpoint source of the noise, then borescope to investigate.

It is very common for water pipes to be a disturbance as water rushes through them. Simply a matter of isolating the pipes to whatever they are held against.

its not a banging noise but water flow noise

Originally Posted by phild01

It is very common for water pipes to be a disturbance as water rushes through them. Simply a matter of isolating the pipes to whatever they are held against.

they are in a concrete floor and bock wall, thats the issue.

Is the noise in the water pipe or drains. Last time I stayed in an Australian hotel the floor drain in bathroom was noisy, probably needed trap refilled.

no water pipes, not drain.

Originally Posted by wozzzzza

no water pipes, not drain.

so what do you suspect the noise is from.

got people middle floor complaining about water noise in the pipes going up the stack and into the shower

got plumber coming next week to look.