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Old 02-08-2018, 12:19 PM   #16
Obo2
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i would just cut out some of the water damaged drywall.
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Old 02-08-2018, 04:32 PM   #17
jadnashua
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Viewing the bottom of the shower from below may or may not help identify where the leak is actually coming from, but it is a minimally invasive way to start. Water can travel a ways, and will take the path of least resistance, so it may not be where you see the water damage. Paying a plumber to open up the ceiling is not the best use of his time, so if you're able to do that, would save you paying him big bucks for that simple task.

Are there any signs in the room with the shower of where moisture might be coming from, such as:
- the wallboard is wet
- grout lines dark, implying things are damp
- the floor is wet
- the back side of the wall in adjacent rooms shows damage upon close inspection (if so, you might poke a hole in there as well)

You can usually take the handle and trim off of the shower valve and see at least a little bit behind to help identify whether the water may be coming from the plumbing.

A small inspection camera with a fiber optic cable doesn't have to cost a fortune (a really nice once does, though!), and you can make a smaller hole to look things over with one.
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Old 02-08-2018, 08:21 PM   #18
Davy
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Like the others said, cutting a hole from below might or might not help. Usually with plywood, the most damaged area is likely where the leak is at. But, if left long enough, the damaged plywood may extend under the whole shower, making it hard to trace.

I was talking about a picture of the plywood from below. I'd cut out a section of sheetrock about 24x24 to start with.
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