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Unread 11-02-2013, 05:03 PM   #1
madronatile
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curbless shower pan mosaic buildup

Any ideas on a good way of building up beneath the shower pan mosaic when it's way thinner than the adjacent field tile in a curbless install?

Sorry for the run-on. Thanks!
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Unread 11-02-2013, 06:14 PM   #2
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Matt,

How was the shower floor constructed? Surface applied membrane? Which one?
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Unread 11-02-2013, 09:46 PM   #3
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Use 1/8" Wedi board?
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Unread 11-02-2013, 10:02 PM   #4
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Ditra with kerdi over it to slope down to the mud deck.
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Unread 11-03-2013, 08:15 AM   #5
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Use trowel of size you need and spread thinset evenly in shower pan, let it dry, fill the voids.
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Unread 11-03-2013, 09:19 AM   #6
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I have done this in different ways as well. I had to fix a poorly sloped pan with lots of bird baths last summer built by a different installer. I bonded “type S” to the pan with thinset. After the “S” cures to a point you can carve it quite nice. Last time I had your situation I pre bonded some pan tile to kerdi and just built up thinset to make a nice transition. I know whatever you do it will be most excellent because that is how your stuff turns out. Let us know what your method turns out to be.
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Unread 11-03-2013, 09:23 AM   #7
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How thick are we talking? Read the label on Laticrete thinsets and you'll be surprised how thick some of them can go.
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Unread 11-03-2013, 02:12 PM   #8
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The way that I've done it is to simply build up the pan higher. I don't have great photos of this but the first one is a traditionally built cbu curbless shower with a liner.

Cut me a little slack on the surface waterproofing. This was a few years ago and I would do a wider section now. I'm always learning.

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Unread 11-03-2013, 02:21 PM   #9
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Here's my one and only liquid shower. Curbless divot, with Ditra, and Aqua Defense. It's harder to tell but the shower pan is built up higher than the main floor.

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Unread 11-03-2013, 04:19 PM   #10
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I do it similar, Jim. The 1/8" step-up is for the Kerdi-Ditra transition. The inside higher mud bed looks like it is one slope on one plane, but it is actually two. 90% of that higher bed is aiming right where it needs to be, but for the last foot, I flatten the slope a little so the waterproofing can go underneath the big floor tile outside the shower, then I build the slope back up by floating thinset to a tiny screed stick after the Kerdi is in. That way all water outside the shower will still drain nicely if it is anywhere near the edge.
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Unread 11-03-2013, 07:53 PM   #11
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Curbless showers have the whole room waterproofed. I lay bathroom floor tile first then screed thinset off the floor tile for thinner shower pan tile.
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Unread 11-03-2013, 09:56 PM   #12
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Thanks for all the replies. I don't think I can guesstimate the different buildups so I think we'll do the thinset after waterproofing approach.
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