Thanks for responding but it’s not for the floor it will only be a decorative for the wall. I am looking for the glass:marble combo for the wall. I have marble on floor only

Once installed the thickness doesn’t matter. Or is there some other concern with the tile you already purchased

Thanks for responding. Doesn’t it have to be same thickness as the tile we are installing around it so that they are all flush (wall tall and this mosaic tile)? I really don’t know about this stuff but the tile installer mentioned it

He put up duralock cement board on the shower surround. I imagine that what you mean about waterproofing system.

So would he put the Kerri board up on top of the cement board and then add the mosaic tile?

Cement board alone is not waterproofing.

This is what he’s installed:

What else should he add to it? Thank you kindly

All seams are sealed, and then I prefer aqua defense - I put three coats in my showers. Jeff thorsten and others on YouTube show how to do it.

You have to ask him what waterproofing system he’s using. And the answer can’t be ‘cement board is waterproof’ or ‘trust me I’ve been doing this forever’. There are a number of systems for waterproofing and make sure they do it correctly. Just like there are a number of ways to pad out a thinner tile to match thicker tile.

That is not an acceptable install.