Question:

underneath flooring?

do you have to have a certain kind of floor underneath tiles. i have hard wood, not hundred percent level. would tile stll be ok

Answer:

If your floor isn't level, your tile will not be either. If you are installing ceramic tile, the tiles will eventually come loose because of the uneavenness of the floor, and the lack of flexibility of ceramic. You must put an underlayment over the wood floor and level it, or you could pull up all the hard wood and then put underlayment (lauan) on top of the bare floor.
Sry but Jason and luann are right and wrg... The hardwood must come up and still yet another subfloor installed. Not luan though... Total sub floor thickness must be no less than 1 1/4 inches thick... Most common is the 3/4 subfloor and 1/2 in concrete backerboard.. But variables apply, check w/ a local install for an on site inspection. And apply self levaling compound and then the proper steps to properly install backerboard GL
You should remove the hard wood flooring, install new tile under layment....and if your floor is excessively out of level, you can apply a self leveling light weight cement product to resolve the problem, then install your tile. Unfortunately, this involves a lot of work, but should be done for the tile to set properly and eliminate cracking of tile and/or grout.
you need to have concrete board underneath the tile, if no the grout will crack and break. You can also use some type of concrete mixture to level up the floors for the tile.

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