Reasons showers leak
Welcome back, Donnie D. here.
You are here because you want to know why your tiled walk in shower is leaking or may be leaking. I will list from my experience what I have seen why a walk in shower will leak. In no specific order.
No waterproofing or lack of waterproofing
Waterproofing not installed correctly
Waterproofing at shower drain connection failed or not installed correctly
In rare cases the shower drain plumbing, or plumbing supply lines
Thats really it. Sad thing it most walk in showers are not installed correctly and lead to failures, which I get called for on a weekly basis .
Most important thing is that your hire a well skilled tradesman and or contractor that has some one who will properly build your shower, which will see more water than your roof.
This video below will go over what I said here in this blog