Lay out the tiles along the first wall that comes up to the corner.
How to tile a wall outside corner.
Cut the final piece of tile on a wet saw to fit.
Use a large spirit level to see if the corner is plumb from top to bottom.
Install the tiles on the first wall making the final tiles flush with the end of the wall.
Hang all the full tiles over both walls leading to the corner starting each wall at the middle of the bottom.
Fill the spaces between the tiles with more grout then wipe the excess grout off with a damp sponge.
Use tile plastic corner trims for a neat look caulk the corners rather than applying grout leave enough room for til expansion.
Use a spirit level or a plumb line to check if the outside corner trim is vertical and adjust it if necessary.
Scoop out a golf ball sized amount of adhesive onto a notched trowel and spread enough adhesive in a thin layer over the wall to hang 2 3 tiles at a time.
Subtract 1 4 inch from the measurement you.
Start applying the adhesive in a bottom corner about 1 tile length away from the bottom and side of the wall leaving space for the edge tiles.
How to ceramic tile an outside corner 1.
Prepare the grout according to the instructions on the package.
Use the same method to install your trim tiles as you did your other tiles.
Next spread tile adhesive on the wall corner and secure the plastic corner trim making sure it is perfectly plumb.
How to tile inside corner walls step 1.
Secure the trim pieces to your wall or counter with tile glue or grout.