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Unread 06-05-2016, 06:04 AM   #1
Nikol
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New Mud or Not

Hello Everyone,

Please help, again (last advice was 2003).

I am stripping down a shower to the stubs. Everything is gone except for the floor. The sub-floor is of concrete. Currently has a liner under mud bed, topped off with small tiles (1978ish original). Slopping is perfect on the old bed.

I am planing on using Schluter mat for waterproofing the stall.

Here is my question:
Is it okay to install a new liner and a new mud bed on top of the old liner, mud bed, and tiles? The block house is on grade...no wood sub floor.

Thank you.
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Unread 06-05-2016, 08:20 AM   #2
Tool Guy - Kg
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Kerdi, if that's what you're referring to as "Schluter mat", is meant to be paired with its proprietary drain in order to achieve 100% waterproofing from the walls and floor, into the plumbing drain pipe. And leaving the pan and tiles on the floor means excluding the drain.

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Unread 06-05-2016, 08:37 AM   #3
HS345
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Hi Nikol. I see no good way to place your new mortar bed on top of the old. How would you tie the drain in? Wouldn't this create height difficulties? Etc, etc.

Sorry, if you want to do this right, the old bed has to come out.
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Unread 06-05-2016, 08:56 AM   #4
Davy
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It's best to bust it up.
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Unread 06-05-2016, 09:03 AM   #5
HS345
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Same exact thread posted in pro's hangout.
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Unread 06-05-2016, 09:15 AM   #6
Tool Guy - Kg
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Hi Nikol.

I've combined your duplicate threads to keep our all-volunteer staff from duplicating efforts. If you'd be so kind as to keep your questions on one thread, we'd be grateful.

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Unread 06-05-2016, 10:12 AM   #7
Eschbach
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Take it out and start from scratch.It will be easier than trying to rig it together.
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Unread 06-05-2016, 10:01 PM   #8
jadnashua
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You might be able to do it with the Kerdi conversion drain, but you'd still have to break out some mortar around the existing drain to get the new one in. Easier, usually, to tear it out and redo. You'd have to review the conversion drain installation instructions to see if you want to attempt that verses a tearout.
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Unread 06-08-2016, 07:27 PM   #9
Nikol
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Help please

Thanks to all that offered input. My husband was able to cut out the huge cast iron shower pan drain that sat on top of pvc drain pipe. We will be Schluter mat the whole stall. Will be reusing the existing mud deck, which is in super condition. Will first scuff and chip some old tiles first. Now, can someone please tell me who has the best deal on Schluter stuff? You guys rock!
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