Do I Need A Cleavage Membrane? - Tiling, ceramics, marble - DIY Chatroom Home Improvement Forum
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Old 04-01-2015, 01:39 PM   #1
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Do I need a cleavage membrane?


I'm installing a 3x4 mortar shower pan in a 2nd floor bathroom.

After much research, I'm leaning towards setting a Laticrete drain in a mortar bed and using Hydro Ban to waterproof everything directly under the tile (i.e. no pre-slope, no vapor barrier).

The Laticrete video says to put a cleavage membrane under the mortar. Do I need to do this on a 2nd floor bathroom, or can I just use some fabric? If I do need it, what should I use?
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Old 04-01-2015, 02:26 PM   #2
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Hi,

Quote:
The Laticrete video says to put a cleavage membrane under the mortar. Do I need to do this on a 2nd floor bathroom
Absolutely, yes you need it. And mainly because it's on a suspended wood subfloor. You can't place mud direct on mud or OSB. If you used "some fabric", as you said. That would be the cleavage membrane, right? Use tarpaper, plastic, old plastic sandwich bags etc. Don't forget the lath. Have you considered a shower tray, the kind you can tile over?

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Old 04-02-2015, 08:07 AM   #3
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Got it. The video I watched used the term "cleavage membrane" like it was a specific product. I was already planning to put down some kind of construction fabric.
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Old 04-02-2015, 09:30 AM   #4
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In the old days we used to call a "cleavage membrane" a bra.Learn something everyday around here.
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Old 04-02-2015, 10:15 AM   #5
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Quote:
In the old days we used to call a "cleavage membrane" a bra.
Well, the word 'cleavage' means a separation, that's what the membrane does. A bra does other things. We just wanna be helpful!

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Old 04-02-2015, 10:27 AM   #6
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Understand Jaz.Have done my share of tile jobs.Just a bad attempt of making a joke.Got rained out today and am bored.
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Old 04-02-2015, 10:30 AM   #7
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Someone HAD to crack a cleavage joke...there's just no way around it.
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Old 04-02-2015, 10:32 AM   #8
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Originally Posted by mako1 View Post
Understand Jaz.Have done my share of tile jobs.Just a bad attempt of making a joke.Got rained out today and am bored.
Oh, I know that you know. I just couldn't resist your lead in making the joke.

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