36″ square tiles = 1 clip per sq. ft. After spreading your tile adhesive, insert leveling spacer underneath the tiles along the 4 sides, use traditional spacers as you normally would to square up the corners. For larger tiles, it may be necessary to “double up”, using 2 leveling spacers for each side.

Uneven Tiles It’s also possible your floor or wall itself is uneven. A slight bump in the floor may become more pronounced with tile over it, so you might notice a difference where you didn’t before. Uneven application of thinset or mortar, which holds the tiles in place, is another potential cause of uneven tiles.

plywood

While tile can be laid on plywood, do not install tile directly onto the plywood subfloor itself. Use intervening layers of two sheets of plywood.

Whenever you’re laying tile on a wood subfloor, you need to first install cement backerboard to prevent leaks and water damage that could harm your flooring and the structure of your home. Unlike wood or drywall sub-surfaces, cement backerboard will not rot, warp or grow mold and mildew when exposed to water.

1 1/8″

Plywood must be installed over an adequate subfloor and must be at least 1 1/8″ thick when combined with the subfloor. Interior-grade plywood and particleboard are not considered strong enough for a tile installation.

The TAVY Thin-Skin Two Part Underlayment System allows you to set tile over any surface without adding additional height to the sub-floor. This simple system can be easily installed by both professionals and DIYers….SKU.

Oriented strand board (OSB) and exterior-grade plywood will work if first covered with a latex-modified mortar and a tiling backer board. Install a cement-based backer board following the manufacturer’s instructions. This provides a solid surface under the tile that prevents flexing that could lead to cracking.

Do I need to put any type of underlayment or vapor barrier underneath it? A: It’s perfectly acceptable to put tile directly on concrete — with a couple of caveats. Those products should help prevent any cracks in the slab from damaging the newly installed tile.

A tile floor consists of three individual layers: the subfloor, the underlayment, and the surface tile you walk on. (Without one, even slight movement of a subfloor can cause grout lines to crumble and tiles to crack.) Good underlayment also provides a waterproof barrier between the tile and the subfloor.

So, in short, you can tile over tile as long as you’re working on a fairly sound surface. The surface of the existing tile should be free of mold and mildew, completely level (including grout), and without any warping or strangely-placed tiles that might otherwise interfere with a smooth new layer.

HOW TO INSTALL TILE OVER EXISTING TILE

1. First, clean and then sand the surface of the old tile until it feels rough.
2. Second, apply a very thin coat of thin set mortar, filling in the current grout lines. This provides a more even foundation for the new tiles to adhere to.
3. And third, let this coat dry for 24 hours.

Forget redo kitchen backsplash, painting the tiles or tile stickers. The best option to cover ceramic tiles withour removing them is not peel and stick backsplash over existing but decorative panels, easy to install, cheap and beautiful. MSD Panels is a manufacturer that works directly with professionals.