water on master bathroom floor. what maybe the cause?

[Jason Sung]

Hi all, 

For a rental home, tenant says bathroom floor keep getting wet, even though it is small amount. at first, they thought they dropped some water. after wiping water, however, it keep coming back and now they think there is some water leak. 

my plumber went to check and found no issue with bath sink. he thinks it must be shower leak. 

the shower was redone last year by a contractor, who i ended up firing since he did not show up to work later. 

anyway, i hired water damage restoration (Servpro) company to check how much damage there is now. 

unfortunately, based on my research, it is very hard to find source of shower leak. i am thinking of rebuilding shower. i hired a kitchen remodel contractor and he gave me two options; either fix shower pan only, or (optionally) rebuild shower as well. 

I am debating whether i should just fix the shower pan. or, rebuild shower as well just in case water leak is coming from shower walls. 

what do you think? I think that my previous contractor most likely did a bad job. maybe i should rebuild the entire shower. but, seems crazy to rebuild shower after remodeling less than one year ago. 

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Just do shower pan repair. $1,520.00

•Demo about 12” of walls and rip out entire shower pan and step 

•Install cement board on exposed wall 

•Apply RedGuard and Waterproof membrane to shower pan and up the exposed walls 

•Install new drain adapter in shower floor 

•Install new tiles provided by client

Optional (just in case fixing shower pan does not fix the water leak) rebuild shower. costs extra $5100

•Demo shower 

• New plumbing for a new fixture 

•Install cement board on exposed wall 

•Apply RedGuard and Waterproof membrane to shower pan and up the exposed walls 

•Install new drain adapter in shower floor 

•Install new tiles provided by client 

•Client provides plumbing fixture

[Scott Mac]

(1) Maybe the wax ring on the toilet is not sealing, and sewage is wetting the subfloor. You might want to think about pulling up the carpet and taking a look. 

(2) Maybe the water delivery piping under the floor, hot or cold, has developed a pinhole leak and is spraying onto the subfloor from below. 

Just my 2 cents.