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jaaassshhh OP t1_je5phmi wrote

Reply to comment by RainStorm13 in concrete shower pan with corner bench -- but forgot to build bench. what to do? by jaaassshhh

Say more words?

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yanman t1_je5s3o7 wrote

Not the plumber, but for one you have screws into the backer board very close to the floor. They probably go through the liner which is a big no-no.

You also have screws through the top of the curb which definitely go through the liner. Again, big bad.

If this were my shower, I would look at wrapping the whole thing in a membrane like Kerdi. You can also incorporate you bench this way as well. The one thing I don't know (and hopefully the plumber will return to answer), is if you can bond the Kerdi membrane to the PVC pan liner. Google says Kerdi-fix will do the trick, but I'd do more research if it were me.

Here's a great 15 minute video on how to completely waterproof your shower: https://www.youtube.com/watch?v=9hPMWc22oK8

PS. get that gravel off of the liner before someone steps on it and pokes a hole.

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vivamario t1_je67tjk wrote

You would put the waterproof membrane on top of the mortar bed after that is poured, if you were worried about the integrity of the shower pan, not directly on the shower pan.

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yanman t1_je6euig wrote

Makes sense. That is the piece I was missing.

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hardknox_ t1_je6id5g wrote

I wouldn't be worried about the curb as much as how low the screws are inside the pan, as the top of the curb isn't going to hold water like the pan will. The pan needs to be watertight to 2" above the curb by code where I am. If they have screws below that, the liner should be replaced and whoever put the board up should pay for it.

Just to confirm: the concrete under the liner isn't flat, right?

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rossmosh85 t1_je739u3 wrote

Your cement board is in the wet. It's not supposed to be in the wet.

Lucky for you, you can still "fix" it by either using Kerdi or Red Guard over your dry pack.

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2g4r_tofu t1_je5r3dn wrote

Not a plumber but the liner usually goes on the inside of the walls so the bottom of the wall isn't sitting in water.

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vivamario t1_je66wfo wrote

No, shower pan membranes should go behind the cement board. The cement board should just stop above the finished floor height.

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MainOld697 t1_je61dkz wrote

Concrete has been poured, this isn't "sitting in water" at any point.

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blargh2947 t1_je65vjm wrote

The liner should come up 10" from the floor depending on local requirements. Not a plumber.

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speakhyroglyphically t1_je6usxm wrote

Screws are high enough. It's fine just tile it. Waters not going behind the grouted and caulked tile.

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rossmosh85 t1_je73ic3 wrote

Yep, water has never gotten behind tiles before.....

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speakhyroglyphically t1_je7akg3 wrote

Too much of a generalization. The pictured system works. With the floor as poured concrete and the cement board i'm assuming thinset will be the adhesive and that will be absolutely fine

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