Stupid question - how do you skim half a wall when a wall is being half-tiled?

[WordBear]

I've got plasterers coming in next week to render the (brick) walls of my bathroom ready for it to be tiled. 3 of the walls will be tiled from the floor to the ceiling and the plasterers are going to sand/cement render those and not skim them. 1 wall will only be tiled half-way up the wall. How is the top half of it skimmed when you want to leave the bottom half as render? There's nothing for the plasterers to render up to. Is it done after the tiling or do you put a batten across the render and do it before the tiling? Or do you skim the whole wall and tile over the skim? I wanted to leave it as render because I know that's the best surface for the tiling. Cheers for any advice.

 

[Dave]

Just skim down past your datum for the tiling , feathering it out to nothing.

 

[WordBear]

Oh great, that's an easy solution! Cheers