STEP 1: EVALUATE
It is very important to inspect the surface in which you plan to install the tiles, it has to be firm and solid, because an irregular surface or uneven, can lead to broken tiles and failed grout. Before start tiling make sure all surfaces are clean.
STEP 2: TAKE MEASUREMENTS
Walls—When tiling a wall, you’ll want to establish a top line that is level. Few walls are truly plumb, so use a level to mark the top line. Establish its height so that you won’t have to cut very thin tiles (or cut very thin shards from nearly full tiles) to come flush to the floor. Snap a top line on your walls, and then snap a center line, too. Be sure to lay out all the walls you plan to do before you begin tiling.
Floors—To make your finished ceramic tile surface appear symmetrical (even if it isn’t), you need to find the center of the surface first. Then measure in from the sides. Pay special attention to this step if you’re tiling a small area, where wide tiles at one edge and narrow ones at the other will make the whole job look out of balance.
STEP 3: LAYOUT
Beginning at the center point, lay the ceramic tiles out to see how they will look, after that lay a row of loose tiles along the center lines in both directions, using tile spacers if your tiles don´t come in net sheets. Once you reach the edge of the walls, you'll need to cut tiles for a proper fit. Use a wet saw to cut the tiles in a more precise way. To make a large room more manageable, divide each section into smaller 2' x 3' grids by snapping additional lines parallel to the centerlines.
STEP 4: APPLY ADHESIVE
As a general advise of thumb, be careful to mix only enough of the adhesive to be used within 30 minutes. Using the flat side of the trowel type recommended on the adhesive package, spread a 1/4" coat on the surface of one grid area without covering the guidelines. Make sure you use a waterproof adhesive. You can use a premixed adhesive or a mortar, but if you choose the latter, make sure it’s a thin-set variety. (Thick-bed mortars require some practice and skill at smoothing to get the tiles to sit flat, and the additional mortar isn’t necessary for a watertight finish.)
STEP 5: GROUT THE TILES
Use grout in powder and mixed with water or a recommended additive. Read the instructions on the package or ask advice at the tile store. Wear gloves and spread grout evenly, being sure to force it into the joints with a blunt stick or another tool. One simple way to enhance your color scheme is to add a dye or pigment to the grout. White grout, even after it has been sealed with a grout sealer (which is recommended, especially for floors), may prove difficult to keep clean.
STEP 6: CLEANING AND SEALING
Please Make sure you sponge off the residue on the surface of the tiles before it has the chance to dry. This process will take a period of an hour or more. It’s a critical stage when you’re working with tiles that have a porous or variegated surface. Dried grout can prove almost impossible to remove from indentations.
Finally, apply a grout sealer according to the manufacturer’s directions, and your tile job is done!