Re: Any plumbers in here?
Without actually being there - but having repaired a ton of these - this is my answer.
For starters - the shower was installed wrong from the start. The plastic base was never designed to be place on wood supports such as you show in your picture. It has to be supported across it's entire surface. You have one of two types of connections from the base to the drain. Either your pipe comes up and has a rubber gasket that is forced into place. Or you have a screw down coupler with a thin rubber gasket. In any case what is happening is as you stand and move in the shower you are flexing the pan which is allowing water to seep between the gasket at the drain. It also may be putting stress on the joint to the walls, causing them to leak.
If it was a supply line leak then it would be wet all the time.
If it was a foundation problem it would be wet after each rain.
It's only wet after use - so it's a drain/sealing problem - as in above.
Anyway - that's my take on it from experience.
Ron
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