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I recently bought a house and in the basement there was an existing shower. The shower base was simply concrete poured on top of the basement concrete floor with a drain, no tiles.

When I demo'd the shower walls, they used the green drywall and 3 layers of 1mil plastic, but I found no rubber liner that I would expect to see coming up from under the concrete shower base.

Here's the shower base: (The insulation is on an exterior wall)

http://basementbathroom.shutterfly.com/pictures/11

In the following photo, the white line between the concrete and wall stud is the drywall

http://basementbathroom.shutterfly.com/pictures/11#9

How can I get that proper waterproof layer that's needed for the base and the walls?

Can I just install concrete board on the walls and then get a nice continuous layer of redguard on the floor and walls?
 

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I think that there is to much wrong with that base to make it saalvageable.

The drain is in the far end and I bet it is only 1 1/2"--

The pitch doesn't look very good either----How to build a shower - Building a shower pan with pre-sloped mortar bed, liner and curb.

There are three good ways to build your own shower base---

Membrane under the pan-----pan and walls first--then a brush on membrane--and the Schluter system ,with a surface mounted membrane--
 

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Hydroban showers are a safe method---if the pan/wall connection is stable.

That is usually done by hanging the rock first and then casting the base against the wall---not possible now.

How big is the drain?Is it an adjustable drain that can be set for tile?
 

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If the drain and P-trap are old and rusty---I urge you to rip it out and update the drain.

Mighty big expense rebuilding the shower walls only to have a lousy pan and worn out drain.

It's your house so ,of course you must make the decisions--but I think building on top of that poorly made base and old rust drain is not wise.

I build bathrooms---a lot of them---and my suggestions come from my world----Mike-----
 

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If the drain and P-trap are old and rusty---I urge you to rip it out and update the drain.

Mighty big expense rebuilding the shower walls only to have a lousy pan and worn out drain.

It's your house so ,of course you must make the decisions--but I think building on top of that poorly made base and old rust drain is not wise.

I build bathrooms---a lot of them---and my suggestions come from my world----Mike-----
Would love to know what you decided and how it turned out
 

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If you can deal with the drain, you can put up drywall or cement board or Kerdi Board, put Kerdi membrane over the curb and pan, and you're ready for tiling.
 
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