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Discussion Starter · #1 ·
Hello, I'm trying to replace the ceramic tile in front of my fireplace insert. I used a hammer and chisel to remove the old tile, and the result left an uneven concrete slab to lay the new tile on. Now, I am left having to find a way to fill in a few spots where the concrete chipped along the corners, and then I need to even out the base to where it's flat enough to lay the tile. My problem is that I can't raise the base by much, as the space between the base and the bottom of the insert is less than an inch, and the new tile is about 1/2 inch thick. Is there a mortar that could be spread on and not raise the floor more than a quarter of an inch, while evening out some of the bumps left from lifting the old tiles?
 

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Discussion Starter · #5 ·
I'm a novice at this stuff, so pardon my ignorance, but what would a modified thinset be? Is it something I add to the thinset? Also, would the thinset work to fill in a few bigger chunks around the edges of the slab that came up when I was removing the old tile?
 

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Thinset is a powdered cement based mix used to set tile---

Unmodified is sand and cement only---the 'modified' has a powdered latex or acrylic in the bag that makes the stuff bond better.

Your picture shows left over white thinset that was used to set those tiles years ago.

You could chisel that off of the floor or (if it is bonded well) Go over the top of it with fresh thinset and tile.
 
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