Replacing Existing Bath Tile Floor with Marble


Old 04-10-09, 12:30 PM
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Replacing Existing Bath Tile Floor with Marble

Hello everyone, I am replacing an existing 2x2" ceramic tile floor with 12x12 " marble.

I have already removed the floor tiles and the first row of border tiles on the wall and the old toilet and sink(which will be replaced).

The wall tiles were put up using what looks like a cement board of some sort. A few places were broken and need to be patched.

Can I use a premix cement patch for repairing those area?

Onto the bigger question. The floor beneath the tiles looks like it also some sort of cement base board. The marble tiles are thicker than the old ceramic tiles, but still low enough that the door closes.

Is that type of subfloor sufficient to support marble?

Also, I was planning on using unsanded grout with 1/8" grout lines. Is that a good idea? I have heard both ways on grouting marble.

And the sealing? Does the tile need to be sealed?



Picture of subfloor

pic of backer board to repair
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Last edited by mbauma; 04-10-09 at 01:09 PM. Reason: Attaching Pics
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Old 04-10-09, 05:56 PM
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Marble needs at least a 1 1/4" plywood subfloor, consisting of 2 layers. After the plywood is installed, you will need a backerboard or other membrane.

Marble is not like a ceramic, and it needs a very thick subfloor. Determine your subfloor thickness now, along with your joist sizes and spacing, and report back here.
Old 04-10-09, 06:02 PM
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Hi Michael,

I see Mark just posted. Do as he says. We'll wait for the answers.

Looking at the pic you posted, what am I looking at? Floor, wall, is it set into thinset mortar and fastened?

Old 04-13-09, 08:16 AM
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The subfloor is 2" of dense press board with 1/2" concrete on top of that.

I do not know the joist dimensions, but we live in an old church, so it should be sufficient.

As to the pics, the first is of the concrete floor layer, the second is of the backerboard behind the 1st layer of the wall tile.

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