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Old 08-27-2014, 07:23 PM   #1
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Tile over tile embedded in thinset over concrete subfloor


I live in a condo building built in the 70's, bathroom was tiled with 1x1 squares in thinset or some kind of mortar. It is ridiculously hard to take off. The subfloor is sound and the tiles are good and level. Can I put thinset over this tile and then some cement board over that? Followed by thinset and tile?

Or can I pour self leveling cement followed by tile+thinset?

What's the right way of going about this?

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Old 08-27-2014, 09:56 PM   #2
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Tile over tile embedded in thinset over concrete subfloor


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I live in a condo building built in the 70's, bathroom was tiled with 1x1 squares in thinset or some kind of mortar. It is ridiculously hard to take off. The subfloor is sound and the tiles are good and level. Can I put thinset over this tile and then some cement board over that? Followed by thinset and tile?

Or can I pour self leveling cement followed by tile+thinset?

What's the right way of going about this?
Doesn't require anything special. Install the new tile directly to the old tile using modified thinset. If the old tiles are glazed (really smooth and slick) then they should be scuffed first.

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Old 08-27-2014, 10:27 PM   #3
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Tile over tile embedded in thinset over concrete subfloor


Hello Bud, thank you for responding. Is that all that's needed? I'm almost afraid that scuffing the surface (every 4th tile is smooth), won't give a good grab for the modified thinset
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Old 08-27-2014, 10:43 PM   #4
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Tile over tile embedded in thinset over concrete subfloor


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Hello Bud, thank you for responding. Is that all that's needed? I'm almost afraid that scuffing the surface (every 4th tile is smooth), won't give a good grab for the modified thinset
That's all that's necessary in this case. Pretty simple and inexpensive actually. Usually a belt sander with 60 (or less) grit sand paper will cause a sufficient amount of ruin to a glazed tiles surface. Aluminum Oxide paper is readily available but Silicon Carbide is better to use if you can find it.

The modified thinset will "grab" just fine.
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Old 08-28-2014, 07:03 PM   #5
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Tile over tile embedded in thinset over concrete subfloor


I would call it "scarifying" instead of scuffing. Bud might be right, and simple scuffing with heavy grit sandpaper might be just fine. I prefer to scarify with a diamond wheel on my grinder, but if you don't own one, I suppose it could be overkill.
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Old 08-28-2014, 08:19 PM   #6
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Tile over tile embedded in thinset over concrete subfloor


in that case, could i perhaps use SLC post scarifying (primer first)? I'd like to raise the level by about 1/4 inch or more.
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Old 08-28-2014, 08:20 PM   #7
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Tile over tile embedded in thinset over concrete subfloor


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I would call it "scarifying" instead of scuffing. Bud might be right, and simple scuffing with heavy grit sandpaper might be just fine. I prefer to scarify with a diamond wheel on my grinder, but if you don't own one, I suppose it could be overkill.
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