Take off the Shower Valve Escutcheon (also called a Shower Valve Plate).
Inspect behind, in the wall, for any sign of moisture or leaking whent eh Shower Valve is turned off. Turn on the Shower Valve to see if when the Shower Valve is turned on there is no leaking.
Ensure the Escutcheon is placed …
Cause & Origin
Residential
Cause and Origin
Moisture
Shower Valve
Shower Valve Escutcheon
Shower Valve Plate

