Rick-The question was about codes...
Your best bet is to contact the local inspector for Local requirerments. Sounds to me that the whole bath area is or needs to be waterproofed.I'm not sure how the code reads in WI. but I do know they had some rules that, I have never heard of anywhere else dealing with the pans and upturnes at corners.
If its leaking already and your tring to avoid a complete tear out ,you need to start adding water slowly until you figure out where or whats leaking. Check the drain and Jonny Ring area first!
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