I had the outfit that made the resin walls and floor come in to see if possible to just repair the wall. (Damage was under pan so it all had to come out) but the field guy told me when I also said the square part of the valve cover was not sealed with anything. He said oh they don't seal them either because more water would go behind thru where the 2 screws that hold the cover on then the top of a flat square cover meets the shower wall. Then said besides you don't want to seal the lower part so the water can get back out.
I said gosh I guess I'm just silly since I put silicone on the top and two side to prevent water from going in behind it. And around the collar the the center of the valve. Cuz I am from the school of thought that less then an ounce of sealant my prevent a $10,000 repair cure.
I stopped listening to what he had to say. And really did want to know anymore the further I dug into their work. Plywood strip sitting on the concrete of the liner put in with drywall screws punching thru the shower pan liner below the curb level. Nothing to prevent water from going down the back of the surface of the onto the drywall and hitting the plywood strip and out of the top of the liner. Liner not over the curb and up the wall in curb corners. More and more but you get the idea at this point.
Curb liner hacked in corner
100% of the mud pan was soaking wet still after leak was fixed for 3ware and no shower use for last of 3weeks.
Mud slope removed liner soaked on top and under neith. Preslope 100% soaked all the way around. This is furthest corner from shower head leak. Keep in mind shower head did most of the trouble.