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Old 02-19-2010, 01:52 PM   #1
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Tile on Concrete


Sorry in advance if this question has been answered before. I am new to this forum !

Here is my situation. I have an older home that is built on a concrete slab. The back of my house has a "screened in Porch"
which only has a concrete floor and a roof at the moment. I am going to be enclosing the room in the spring time and looking to put down a slate tile floor. I am going with tile becuase I am also going to be installing a wood burning stove.

My question is: What would be the recommened subfloor ?

Here is what I think: Concrete-Vapor Barrier-Sleepers (with foam board between)-Plywood-RockBoard-Tile.

I am not to sure what would be the correct thickness of any of these materials either, Please help thanks.

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Old 02-19-2010, 03:18 PM   #2
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Tile on Concrete


Concrete is the ideal base for tile--------Unless the slab is badly flawed-you are ready to tile.

If you will let us know where you are it will be easier to offer advice.

If you are in a freeze/thaw area your slate will not last to long,Slate will absorb moisture and split when frozen. Look for tiles that are Mohs 4 or harder,in freeze thaw areas.--Mike--

Your proposed floor system sounds O.K. in the room is weathered in and you want a warmer floor.

Treated sleepers,glued and screwed (tapcon)--Then vapor barrier is better.


Last edited by oh'mike; 02-19-2010 at 03:22 PM.
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Old 02-19-2010, 03:27 PM   #3
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Thanks

The whole reason behind raising the floor was due to the cold. The slab itself is in good shape but to low to the ground (maybe 4 inches). I am also thinking about using Ditra instead of RockBoard

I am in Central NJ
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Old 02-19-2010, 03:53 PM   #4
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Ditra is a good choice. I've done this exact thing,using 1 1/2 " foam --9 years and good as new.

It sounds to me that you have a good grasp of how to do this one.--Mike--


If you go ahead with the slate--glaze it well before you grout.
Raw slate can be ruined while grouting.

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Old 02-19-2010, 04:06 PM   #5
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QUOTE]Ditra is a good choice. I've done this exact thing,using 1 1/2 " foam --9 years and good as new.[/QUOTE]

1 1/2 foam ? What size sleeper did you use ?

I have a good idea of how to do this. I think the best bet for me is

Vapor barrier-1inch sleeper-1inch Foam board (Sealed with foam)-1/2 inch T&G Plywood-thinset-Ditra-Thinset-Slate Tile

I also dont want to have to jump into the room when entering it
What do you think ?
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Old 02-19-2010, 04:29 PM   #6
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1/2"ply tothin
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Old 02-19-2010, 04:34 PM   #7
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Quote:
1/2"ply tothin
what do you suggest ?
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Old 02-19-2010, 04:35 PM   #8
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On that floor I used 2x4 sleepers---3/4 t&g ply subfloor is the MINIMUM no 1/2 to much flexing.

That is what TPOLK was trying to say--Trying to talk with a mouth full of chocolate cake,I think.
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Old 02-19-2010, 04:42 PM   #9
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chocolat be very good to me
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Old 02-19-2010, 04:44 PM   #10
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You want to glue the sleepers down,and use screws-- this reduces flexing and bounce.

Another benefit--Tapcons are expensive and take time to install.

Treated wood must be used against the concrete. Vapor barrier on top then your 3/4 ply.--Mike==
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Old 02-19-2010, 04:54 PM   #11
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Quote:
On that floor I used 2x4 sleepers---3/4 t&g ply subfloor is the MINIMUM no 1/2 to much flexing.
That sounds great. The question I have now is ,Wouldnt the floor be above the Sole plate by 3/4 of an ich if I am using 2 x4 ? I will be framing the room and I do have the option of using a double Sole Plate if I can.
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Old 02-19-2010, 05:01 PM   #12
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Good plan--sure will make trimming the room easier--------
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Old 02-19-2010, 05:04 PM   #13
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Once again, Treated bottom plate.

Consider buying a roll of foam sill sealer.(3 1/4" wide foam-keeps out air and little bugs)

Last edited by oh'mike; 02-19-2010 at 05:07 PM.
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Old 02-19-2010, 06:16 PM   #14
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NEVER use treated lumber anywhere tile is going.

What condition is the slab in, if good and no cracks, paint, sealers and is flat, Ditra, then tile.
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Old 02-19-2010, 06:31 PM   #15
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R&D--Have you read his requirements?

Are you concerned with the sleepers shrinking?

Bit of a smart axx thing to pop into a situation and make a comment like that without an explanation,Why did you behave that way?

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