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Old 06-04-2019, 10:24 PM   #5
Tool Guy - Kg
Moderator -- Wisconsin Kitchen & Bath Remodeler
 
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Join Date: Feb 2005
Location: Oak Creek, WI
Posts: 21,040
The apparent efflorescence (white salt-looking mineral) on the outside of the curb hints that the curb has a lack of waterproofing. It appears that moisture is entering the curb from inside the shower and exiting the curb where the white stuff is.

If you get down close, can you see a crack under the top tiles on the inside of the curb?

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