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Old 03-19-2018, 07:42 PM   #1
jlogan
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Tile at exterior door, height question?

Attached is a pic of my dry install with tile and durock at exterior door threshold. I'm concerned about my height here. I've got a 1/4" left from top of threshold to top of tile.

How much growth can I expect from mud under the durock and then thinset below tile?
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Old 03-19-2018, 08:06 PM   #2
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Hi, Jerry.

Boy, that’s really pushing it. If you’re using a 1/2” notched trowel for your tile, that collapses down to a little less than 3/16”. And the mortar under the cement board might be a pinch over 1/16”, depending on the exact size trowel (lots of pros may be using a 1/4” notched trowel that’s worn down to about 3/16”).

What is your subfloor? How thick of Durock were you planning? Would you consider using Ditra instead of Durock? Can the door be moved up at this point in construction?

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Old 03-19-2018, 08:22 PM   #3
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I've got osb subfloor, 1/4" durock and was planning on using a 1/4" x 1/4" trowel. Negative on the door being moved up.
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Old 03-19-2018, 08:24 PM   #4
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Oh and have no idea about Ditra. So hadn't considered it.
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Old 03-19-2018, 08:48 PM   #5
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This would save you 1/8".
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Old 03-19-2018, 08:58 PM   #6
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Yea, I think I'm already sold on the idea. Do I still us unmodified under the Ditra? I've got two bags that cover 75sq ft./bag. on a 132 sqft. kitchen floor.

This for the thinset under tile

http://https://www.homedepot.com/p/Custom-Building-Products-VersaBond-LFT-50-lb-Gray-Fortified-Medium-Bed-Mortar-VBLFTMG50/205789819

This for under Ditra.

https://www.lowes.com/pd/MAPEI-Large...um-Bed/3743785
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Old 03-19-2018, 10:08 PM   #7
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Depends on what you're installing Ditra over. Assuming this is plywood, the regular Versabond will work. You don't really need a large format mortar under Ditra.
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Old 03-20-2018, 05:56 AM   #8
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if your installing ditra over plywood you do not want to use the versabond lft. it doesn't inbed the fleece enough. ive tried. regular versabond does a way better job. so id take the lft back and get the regular.
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Old 03-20-2018, 01:00 PM   #9
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I'm installing over OSB. Will the regular work for that too?
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Old 03-20-2018, 01:10 PM   #10
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Yes it will.
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