infiniteMPG wrote:

Read any instructions that come with the materials. They sometimes
tell you the allowable variation.

Haven't purchased the tile or thinset yet so wasn't sure.

For 1/8", don't worry about it. You can put a little extra thinset
under the tiles that go in the low spots.

Was thinking that as trying to pour concrete leveler then that would
probably require a lot of work. Was being told that it had to be
almost exactly level as tile sitting over a low spot might crack. But
I thought the tile isn't sitting on the concrete, it's sitting on the
thinset. so if the thinset could support it being a little thicker
then there shouldn't be a problem.

Buy your tile from a tile store. It might cost a little more, but
you'll get it back in support.

The problem comes when there's a void under the tile. Spread the
thinset well on the floor and butter the back of the tile. That'll give
you better coverage.

--
Steve Bell
New Life Home Improvement
Arlington, TX