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Murdy 11-26-2011 08:29 AM

Ceramic Tile on Concrete Slab
We are planning on laying ceramic tile on a concrete slab. We'd like to raise the floor level. Would concrete backer board (durock, etc) screwed into the slab be an acceptable way to do this?

JazMan 11-26-2011 10:18 AM



Murdy 11-26-2011 10:54 AM


Was wondering if anyone had an idea on what would be the right way to do this. Ditra XL has been suggested to me, but the manufacturer's website says its 5/16" thick, and we need to go up a little more than that (quarter inch, about). The slab has cut-out on it, and I've read that even after its cleaned, there will always be some residue that causes adhesion problems. So, I'm trying to figure out how to get some surface down that I can lay something over (like Ditra of backer board). Every solution I think of seems to run into some problem.

oh'mike 11-26-2011 01:52 PM

How high are you hoping to raise it?

Murdy 11-26-2011 04:22 PM

About a half inch, our first thought was OSB, since we used that elsewhere, but have discovered that's not a good idea with tile. Then I thought half inch cement board. Now I'm wondering if quarter inch OSB or plywood or something else under Ditra XL might work. I'd appreciate any suggesgtions.

oh'mike 11-26-2011 04:30 PM

No wood of any type is safe on a slab----That's not enough height to use deck mud---that was my thought---Self leveling compound mixed with sand or pea gravel might work,but be costly--

Jaz and Bud Cline are tops on these odd situations---Let's see if they have a good one here.

Volt75 11-26-2011 05:10 PM

Mike is right. Use self leveling cement or compound to bring up to the level you want.

Murdy 11-26-2011 05:36 PM

Thank you very much for the advice. I used a product called jif set a long time ago, for some reason, I figured I wouldn't get the height I wanted with something similar (which is why I'm a novice, lol). Was wondering if anyone knew if there were issues with a product like that adhering to a floor that formerly had cut back on it?

oh'mike 11-26-2011 06:41 PM

Jifset is approved for use over cut back when mixed with Linewebers liquid latex.

You will only need it on the first layer--then water will be fine---

Add sand or pea gravel to stretch the product---the instructions are on the bag.---Mike---

---Menards carries the large bags---

Bud Cline 11-26-2011 09:54 PM

If you were to use DITRA-XL which is 5/16" thick, by the time you get some thinset under the DITRA-XL and by the time you get some thinset under the tile - you should just about be where you want to be.

How important is it to you to be exactly on the gnats a$$?

There's another way if you are going to be insistant but I'll wait and see your response so far before I continue.:)

Murdy 11-27-2011 09:20 AM

Thanks all.

Absolute precision is not important, just trying to get the kitchen floor to about the same level as the living room, which apparently does have something under it.

Bud Cline 11-27-2011 11:40 AM


Absolute precision is not important,

Glad I didn't waste any more time explaining the other method.:)

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