water leaking shower room condominium

[thestar1212]

Hello everyone, I got some issues on my current condominium

THere had been some water leaks to the downstairs neighbor, precisely in the shower area.

I had engaged wateproofing expert to do some chemical waterproofing, but to no avail, the water is still dripping. The company ultimately gave up and asked us t find some plumber or contractor as they suspect it is due to structural issue and piping. However when I engage plumber, they said otherwise and it is due to waterproofing issue. I am confused on what to do and where to go

I had opened up the drain hole and poured water directly in, and the water it is still dripping downstairs, without touching and going through the floor tiles, so i believe this is not due to waterproofing issue? or am i wrong?

I had also checked my water meter and it is not moving at all even when i am not using it for 8 hours so there should be no leak from this side

thanks in advance for any advices and suggestions

 

[Terry]

For testing, we can plug the drain, and then fill the pan with water to see if the pan itself holds water.
Is this is tiled shower, or a fiberglass pan? Sometimes it's the drain that leaks at the pan over time. Plumbers putty can fail at the drain over time.
I've also seen water leak past the valve at the wall. Sometimes that just needs caulking to prevent water bouncing off a body and onto the plate.
I have also seen damaged shower arms that leak and need replacing.
Lastly, it could be the piping below the floor. You start at the pan level, work your way up until you find it, and if not there, then it may be the pipes below.