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Old 06-20-2008, 09:05 AM   #1
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Tile on concrete floor....with 1/8th inch cracks..


I would like to put tile(probably slate or travertine) down on my basement concrete slab floor when I finish it. The floor currently have 3-4 long cracks no wider than 1/8". What approach would be best to put down tiles? Should I thinset right over the concrete? Or could I put down cement board, tape them together and then thinset the tile to the board(intent would be that the cracks could move/increase/decrease in relation to the board with no effect)?

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Old 06-20-2008, 09:37 AM   #2
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Tile on concrete floor....with 1/8th inch cracks..


I had a problem like yours so I filled the cracks with an epoxy,painted the floor with water proofing and then thin set and tile.I would go around the room first and make sure your level if not you may need some self leveling cement before the thin set but I don't see the need for cement board on top of a slab.If the house has a few years on it most of the settling will have already occurred although some is constantly going on but it should not be enough to cause you any major problems down the road at least imo

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Old 06-20-2008, 09:39 AM   #3
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Tile on concrete floor....with 1/8th inch cracks..


House is 12 years old. Seems like the cracks are still moving a little.

Floor is flat with no real ridges, high or low spots.
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Old 06-20-2008, 09:47 AM   #4
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Tile on concrete floor....with 1/8th inch cracks..


I really dont see what good cement board is going to do.You will still have to glue it to the slab so if the cracks increse the board will move and you will have the problem anyway so I would just do as I suggested fill ,coat ,thin set,and tile
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Old 06-20-2008, 09:51 AM   #5
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Tile on concrete floor....with 1/8th inch cracks..


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I really dont see what good cement board is going to do.You will still have to glue it to the slab so if the cracks increse the board will move and you will have the problem anyway so I would just do as I suggested fill ,coat ,thin set,and tile
Why would the board have to be glued/adhered/attached to the cement slab?
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Old 06-20-2008, 09:54 AM   #6
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Tile on concrete floor....with 1/8th inch cracks..


how would you keep it stable if you dont attach it
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Old 06-20-2008, 09:59 AM   #7
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Tile on concrete floor....with 1/8th inch cracks..


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how would you keep it stable if you dont attach it
Keep it stable from what? Im not trying to be difficult, just trying to understand as I am by no means an expert.

If the cement boards are all placed on the slab, then connected with joint tape and the tiles are attached to the board via thinset, the weight alone would keep the entire piece from shifting or moving relative to itself but should allow the cracks to expand or contract in relation to the board/tile layer. Essentially it would be live a floating floor, just heavy.
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Old 06-20-2008, 10:08 AM   #8
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Tile on concrete floor....with 1/8th inch cracks..


and as dampness comes up through the slab as it will with changing weather over time the cement board will absorb that moisture and warp on you then you will have a wave in the floor.The people who had this house before me tried the same thing only they put down a wood type tile over the cement board and when I looked at the house before buying it all the tile was rippeled from that very reason.Now if you live in a place where temp is not a consideration it may work but I still dont think I would go to the time and expense of it unless I was in an earthquake zone
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Old 06-20-2008, 10:08 AM   #9
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Tile on concrete floor....with 1/8th inch cracks..


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Keep it stable from what? Im not trying to be difficult, just trying to understand as I am by no means an expert.

If the cement boards are all placed on the slab, then connected with joint tape and the tiles are attached to the board via thinset, the weight alone would keep the entire piece from shifting or moving relative to itself but should allow the cracks to expand or contract in relation to the board/tile layer. Essentially it would be live a floating floor, just heavy.
The manufacturers of cement backerboard recommend using thinset to bond the board to the floor, as well as mechanical attachment of the board.

I'd suggest doing your best to fill/seal the cracks and hope the floor stays stable. If it doesn't, the cracks will telegraph through, and nothing can be done to prevent it. The floating tile floor option is not a good option.
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Old 06-20-2008, 10:10 AM   #10
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Tile on concrete floor....with 1/8th inch cracks..


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The manufacturers of cement backerboard recommend using thinset to bond the board to the floor, as well as mechanical attachment of the board.

I'd suggest doing your best to fill/seal the cracks and hope the floor stays stable. If it doesn't, the cracks will telegraph through, and nothing can be done to prevent it. The floating tile floor option is not a good option.

Would you be able to explain why the floating tile floor option isnt a good one? or Wouldnt work? Be as technical as you want, i wont have a prob.
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Old 06-20-2008, 11:02 AM   #11
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Tile on concrete floor....with 1/8th inch cracks..


You should NOT tile over a painted concrete floor.
You do NOT want to put cement backer over concrete.

Address the cracks with an appropriate filler and I'd suggest to use a membrane before tiling. You can, however, tile directly over the concrete.

I'd recommend the membrane.
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Old 06-20-2008, 12:45 PM   #12
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Tile on concrete floor....with 1/8th inch cracks..


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You should NOT tile over a painted concrete floor.
You do NOT want to put cement backer over concrete.

Address the cracks with an appropriate filler and I'd suggest to use a membrane before tiling. You can, however, tile directly over the concrete.

I'd recommend the membrane.
Would you be able to recommend a membrane and explain what its fuction is and how it works?

THanks.
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Old 06-20-2008, 12:54 PM   #13
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Tile on concrete floor....with 1/8th inch cracks..


Ditra by Schluter.

http://www.schluter.com/5502.aspx
http://www.schluter.com/5510.aspx

Available typical at Home Depot for around $1.75USD sq ft.

Installation instructions must be followed.
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Old 06-20-2008, 01:17 PM   #14
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Tile on concrete floor....with 1/8th inch cracks..


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Ditra by Schluter.

http://www.schluter.com/5502.aspx
http://www.schluter.com/5510.aspx

Available typical at Home Depot for around $1.75USD sq ft.

Installation instructions must be followed.
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Old 06-20-2008, 04:36 PM   #15
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Tile on concrete floor....with 1/8th inch cracks..


trying to get 20 posts, this is dumb.

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