Install the wall tiles in such a way as to have a clearance space 1 8 1 10 between the corner and the tiles to leave them enough room to expand.
How to tile outside wall corners.
Space the two tiles consistent with the rest of the tiles generally 1 8 inch which will leave a 1 4 inch space at the corner.
If you have to install full tiles along the internal corners we recommend you to spread tile adhesive directly to the wall by using a large notched trowel.
On the contrary if you have to install cut tiles you should spread the thinset to the back of the tiles and install it with the cut edge pointing towards the inside corner.
1 lay out the tiles along the first wall that comes up to the corner.
All you have to do is to start installing wall tile on one side of the corner.
Spread the adhesive on the wall with a notched float and make sure the tiles are plumb use a spirit level to be sure.
This do it yourself video how to install tile edge trims on a shower outside corners shows how to install tile edge trim on a wall and curb outside corne.