Water Damaged Shower Repairs

The water will penetrate the pan through grout and there is a lot of condensation underneath the tile for as long as the shower is in use. It will dry in 3 months' time if you do not use it. The dry pack mud is always wet trapping in the water. That moisture has nowhere to go, and it starts migrating usually behind the walls causing nothing but trouble on the way out, they all have black mold which grows from inside out. My opinion, the Oatey shower issue is, the shower pan liner attaches to the drain via 4 bolts that later will rust, that rust in conjunction with water/moisture will in some way contaminate the pan liner. Over time the liner gets brittle and fails in one way or another. When you remove the liner, it cannot take a fold, that’s how bad it is. Since we are dealing with suspended floors (which no one talks about like we live in a perfect world) there is always a bouncing on the joist, it all depends on who is using the shower 100lbs vs 350lbs. That amounts to the shower pan liner failing. I suppose it is called friction. Speaking about the pre slope: what would happen if the shower pan liner would be squashed in between two layers of concrete (dry pack) on top of all the water punishment it takes from that running water, rusty bolts, bouncing in the joist etc. Rubber in between two layers of dry pack mortar does not sound good from my point of view. I would say the failure would be at a higher rate.

If you were to build a pre slope out of timber that would make a heck of a difference. It can be done, but no one is doing that.