Hi - it was built during the framing stage out of studs and then covered with cement board and waterproofed. It's simply a wall that doesn't go all the way to the ceiling.

Thankyou!

I am guessing studs are wood/ timber

(we mostly use brick walls here in Cape Town, SA)

So i may need to think of another way to put a horizontal ledge for the shampoos etc that is supported within brickwork :)

hello. if you are using tile. you could make a cutout on each end wall and on the main wall sit it on top of the wall tile. the continue the tile on top of ledger. make sure tile guys set a slight bevel of at least 1 to 2 degrees for water runoff.
thick temper glass makes great shelves and granite or quartz. wood would need to be water proofed. but serves the same and tile over it after it is water proofed. just ideas. RE Manley Construction Design / Build Southern Georgia.