Depends on the size of the tile. Bigger the tile, the more mortar. 4x4, 4x6 wall tile, 1/8 th should be enough, 12x12 and 16x16 should be 1/4 and for anything thicker, go to the 1/2 notch trowel.
White thinset
Modified thinset or An approved tile mortar.
it could be a number of things, premixed thinset, to much flex in the substrate, mixed thinset too thin, didnt seal grout "if in shower" where is the tile installed, what did you use to install it and how did you install it?
The videos which suggest lifting a tile to check the thinset coverage on the back are right. If you are installing tile for the first time, this is a necessary step to be sure you have the technique right. For floor tile up to about 12" x 12", you'll use a 1/4" x 1/4" square-notched trowel. For larger tiles, you should use a bigger trowel - about 3/8" or so. Dip some thinset from the bucket, drop it on the floor, and then spread it out. Hold your trowel nearly vertical at the edge, with just a slight angle so you can drag out the thinset. It should leave deep grooves in the thinset that stand up on their own, and you should be able to see the floor surface between the grooves. When you place the tile, hold it as level as you can and then carefully place it on top of the thinset. Wiggle it back and forth slightly, as you apply LIGHT pressure downwards, and evenly. You want the thinset to make good contact on the back of your tile, but not so much that you flatten it out. If thinset is oozing up between tiles, you're pressing too hard. Check to see that there is no "lippage" - or uneven heights between adjoining tiles. The surface should be perfectly level to surrounding tiles. Peel up a tile, and check the thinset coverage on the back. It should cover at least 75% of the back of the tile. If it is less, then you're either not pressing hard enough, not using enough thinset or spreading it too thin, or your floor surface is too uneven. If all looks good, scrape the thinset off the tile and that section of floor where it was removed, and reapply and reinstall.
One common use is in tiling.
Thinset or Speet set would be better
The thin set you should use over plywood is called Durabond. Durabond is a water-based coating that dries to a hard, durable finish. It can be applied directly to new or old drywall and will not cause any harm if it comes in contact with insulation.
Thinset tile cement.
You can use the bounded tiling problem. Given a problem in NP A, it has a turing machine M that recognizes its language. We construct tiles for the bounded tiling problem that will simulate a run of M. Given input x, we ask if there is a tiling of the plane and answer that will simulate a run of M on x. We answer true iff there is such a tiling.
White or Gray Thinset would be indicated & best
Yes, we all do that.
i don't know sis