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Old 02-26-2018, 10:13 PM   #1
Chairandy
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Prefered underlayment for bathroom recommendation..

Need to add !/4" underlayment to bathroom floor (over 3/4 ply t &G over I joist at 16 oc)) that will be tiled and would like suggestions regarding what is the best material to use. Cement board / plywood hardi backer?? I have an issue with height and want to stay at 1/4' ... if I use cement board with thinset etc. Any suggestions will be appreciated.
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Old 02-26-2018, 10:26 PM   #2
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If your subflooring and joist structure is sufficient, 1/4" cbu will work, but it will end up slightly more than 1/4" because of the required thinset underneath it.

Ditra would be less than 1/4" (closer to 1/8"), but Ditra XL would be close to that 1/4" once installed.

It's almost impossible to find 1/4" ply that is qualified to work underneath tile.

1/4" Wediboard could be used, but again, it might end up slightly over 1/4" (well, the stuff is actually metric, so I'm not sure!).
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Old 03-02-2018, 03:09 PM   #3
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Leveling large wall tile ...

This my first tile installation with 12 X 24 tiles on floor. I plan on using levelers and back buttering tiles. Is this standard procedure? Also, shower wall tile is 3 X 12 applied to 1/2 inch kerdi board, Is it recommended to self level these tiles also?

Thanks for your response....
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Old 03-02-2018, 05:51 PM   #4
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For optimum bonding, except maybe for small tile, is to back butter each prior to installing on the surface. The difference in bond strength can be huge, depending on technique.

If your surface is perfectly flat and smooth, you can use a thin layer of thinset, the tile can't be pushed into the thinset very far and it will be easier to keep everything level. But, reality sets in, and you normally need a bit more thinset, and the larger the tile, even a slight error in setting it can make one edge sit higher than another. Plus, larger tile often have a slight (or significant) bow in them, requiring a deeper layer of thinset. IMHO, the larger the tile, the more useful a leveling system is. You can certainly do it without, but it takes more skill and time to achieve good results.

You can use it on smaller tile. When used properly, you should end up with about as perfectly flat surface as possible with the tile used (not all tile are perfectly flat!).
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Old 03-03-2018, 10:01 AM   #5
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Hi Andy,

On tiles as small as 3/12 I would not bother with edge leveling systems. I need to define "level," though, as opposed to flat or even. The so-called edge leveling gadgets even out the surface from tile to tile. They don't "level" anything.
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Old 03-03-2018, 10:13 AM   #6
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Andy, let's keep all questions related to this project on this thread so that questions and answers aren't duplicated, and the history is in one place.

I would use a leveling system for the larger tiles, but not on 3x12's. You should be able to get them pretty flat if your wall is flat.

On the 12x24's you'll find it a bit more difficult to keep everything flat. If you try to build up low corners with mortar, the tile will tend to settle into the mortar due to the weight. That's where the leveling system pays off.
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