Here are a couple of pics hopefully they will make things clearer.
Tiling external corners without trim.
If the angle of the two walls is less than 90 degrees just adjust the angle of the cut to less than 45 degrees so the two external edges meet or you will be left with a gap at the corner.
Set the wall then the corners then the jamb tile.
Tiling angles architectural trims brass aluminium or stainless steel tilers online can help you with a range of tiling angles and trims.
These tile corners available in plain colours or polished chrome will create a rounded corner and finish off the job perfectly whilst protecting your tiling.
To give the edge a clean water tight finish place a piece of masking tape one grout joint away from the edge of the last tile.
Place bullnose or rounded field tiles on the jambs.
The outside corner is part of bathroom shower corner that need to be tiled.
Provides a rounded finish where tiles join at 90 angle either horizontally or vertically such as bath hobs or columns in a commercial application.
This do it yourself video shows how to tile outside corner without bullnose.
External corner trim.
Karis 23 jul 2012.
Fill this gap between the tile and the masking tape with a smooth.
Apply a decorative border strip around the recess.
The layout of the tiles is extremely important when starting a tile project by yourself.
From tile edging to transition trims expansion joints and balcony edge trims we have everything you need.
On the other hand if you like the traditional appearance of tile corners you can pull it through without using the tile corner trims but it will take more time and effort from your side.
If you are looking to connect a three way join then edge corners are your best bet.
Use corner edging tiles similar to countertop v caps but without the raised lip that forms the front edge of the counter.