If you are talking about the tiles and not the CBU, I always install the wall tiles first then the ceiling tiles. The reason being, if you install the ceiling first, then the walls and your cuts aren't perfect, you could potentially see the tile line when looking at it from the room. If you do the walls first then the ceiling, you have to get in the shower put your head on the wall and look up to see any defects.
I feel it gives it a cleaner look.
With the CBU, I do the pan first, then the ceiling then the walls.
I feel it gives it a cleaner look.
With the CBU, I do the pan first, then the ceiling then the walls.