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About two years ago I noticed one of my showers was leaking. I didn't have the wherewithal to fix it at the time so l just shut down the shower. I opened up the ceiling recently to finally deal with this project, called a plumber in... and it's not leaking anymore. Pipe looks fine. There are some old wet spots from these photos. I ran the shower awhile, nothing. Threw buckets of water at the shower walls, got my jeans soaked but no leaks.

Plumber says maybe just a caulk/grout issue on the sides that only comes up occasionally. I was planning to close the ceiling while leaving an access panel in case I need to go back in and continue to monitor it. But curious, based on this story and the photos, if there's something else I can do to check for leak source before I put drywall back.shower that is source of leak

plumbing underneath

plumbing underneath

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There look like water stains in the blue circled areas:

water stains on OP's under-shower picture

Maybe the tile floor or where the floor drain joins the tile floor is leaking?

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  • That was my assumption — a pan problem, or the pipe isn’t securely attached to the pan. Do you think this is a solution with caulk and grout, or am I potentially going to have to replace my shower floor (and thus my whole shower)? Commented Nov 5, 2024 at 17:02
  • I regret that tile & showers are rather far outside my skillset. Will have to let the house builders weigh in. Commented Nov 5, 2024 at 17:49
  • I would continue to monitor. Perhaps you can tape up some toilet paper in the locations @Triplefault pointed out (plus the trap drain)—this will help tell you whether leaks are continuing. Commented Nov 6, 2024 at 13:41
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There is some corrosion and oxidation on the trap plug so that might have been the leak and the rust/corrosion could loosen up in time. It's a great idea to install the access panel to continue to monitor this. I'd use the shower for awhile before adding drywall since leaks never happen the way we plan them.

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