Don t grout the corner line between the two walls or the joint between the backsplash and the countertop.
How to tile into a corner on a wall.
Use a large spirit level to see if the corner is plumb from top to bottom.
Grout the tiles on both walls pressing your grout into the lines between the tiles with your grout trowel.
Mark your cut lines on the top of the tile with a felt tip pen when you are ready to fit your tile to your inside corner.
Use your tile cutter to score the lines and carefully tap the corner tile or use a wet saw to cut it out.
First spread thinset along the corner and secure the trim by pushing it gently in the adhesive.
Next start installing the wall tiles making sure you fit them inside the corner trim.
Butter the back with adhesive and press it into place with the cut edge facing into the corner.
Wipe off the excess grout with a damp sponge.
Depending on the type of tile you are using check with the manufacturer s instructions for how to apply the thin set and set the tile.
Use a spirit level or a plumb line to check if the outside corner trim is vertical and adjust it if necessary.
Place all the whole tiles on both walls either side of the corner.
Hang all the full tiles over both walls leading to the corner starting each wall at the middle of the bottom and building up and out.
Let the grout set for two days.
Use a spirit level to check if the corner trim is plumb and attach it again if needed.
Then do a dry fit to the corner making sure you leave.
How to tile inside corner walls.
Step 4 applying adhesive.
Next spread tile adhesive on the wall corner and secure the plastic corner trim making sure it is perfectly plumb.