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Shower Waterproofing

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Oatey perfect slope under Oatey pan liner. Mudbed before or after cement board walls?

I have Oatey's Perfect slope underneath the pan liner. 3 2x4s as curbs. I had a plumber install the liner.



Do I do my mudbed/dry pack before or after I put up the cement wall boards? I've read and seen it both ways.


I plan on Schluter Kerdi over the cement boards and curb.


Thanks in advance, this is my 1st try.

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Isaac Ostrom
Isaac Ostrom
Jul 26, 2022

Hi Tim- no need for schluter kerdi over the curb and mud bed. The pan liner is your waterproofing. This is the traditional method of doing a shower whereas Kerdi is a completely different system and incorporates a different (bonding flange) drain.

The method you are using will require installing cement board (Durock not Hardiebacker) first and then floating up to it. No screws below 3" above the curb (the mud bed will pin it in) and I recommend installing dam corners as well.

You will also need to float your curb as I did in this video:

https://youtu.be/E8iuRBxmTaA

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