The edge is fully glazed and is used to cover up both the edges of the two tiles that meet at an outside corner.
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.
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.
Apply mortar to the back of the tile with the notched trowel.
Press the tile against the wall with the cut side facing the corner and the other edge next to the last full tile in the course.
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.