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We had a new shower put in (by a contractor who was in over his head) during a remodel a few years ago. About a year ago the built-in-bench starting to collapse. When we pulled out the bench we noticed that there was no shower pan under it- eek! We need to add one.

Here's my question? Can we simply fill it in instead of starting over. Every contractor that has looked at it says that they have to pull out the existing floor (which includes the tile that I'll have a hard time replacing). I don't mind having to replace wall tile... i just want to avoid pulling out the floor.

I'm convinced that there has to be a way even if it's unconventional.

current shower situation

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What's the liner material we're seeing? –  bcworkz Dec 28 '13 at 22:07
    
Do the contractors that you bring out say why you need to rip up the floor? Could it be something unrelated to replacing the bench? –  Edwin Dec 29 '13 at 7:31
    
You have options. You can cement another membrane over the existing CPE membrane. You could use a liquid waterproofing membrane like RedGard. It depends on how much of your existing membrane is sticking out and what condition it is. –  Edwin Dec 29 '13 at 7:36
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If the contractor screwed up one part of the shower, other parts are suspect too. Did he cover the weepholes in the drain assembly, did he cut or improperly fold the corners of the membrane, did you fir the concrete board off the walls so any penetrating liquid will drain off inside the membrane. If you have doubt, I'd start over. Better now that in 5 years after you find out you rotted out a joist or two below the shower. –  Keith Hoffman Mar 5 at 7:27
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Those benches always leak. If you watch Holmes on Homes or any of those repair shows on HGTV or DIY, they are never made correctly and end up leaking. Usually whoever made the bench incorrectly, also did the rest of it incorrectly as well. You can certainly try to cement on another membrane and it may last you a couple of years, but it's going to have to be gutted eventually. –  Zach Oct 1 at 15:50

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