I'm no expert. I just did a whole lotta research here before I tiled my shower, so I don't know the best way to deal with the different levels. I don't believe there will be a problem, but maybe Bud or Jaz will show up to verify this.
I just want to clarify a couple things in your pic. Is that going to be a niche (with the caulking gun and hammer)? Is it going to be inside or outside of the shower?
And is that a window on the right side. FWIW, a wood window in a shower is a bad idea.
Originally Posted by jelly
how much of a gap am i suppose to leave between the boards?
When I was doing my research I read to leave a small gap between the hardiebacker boards. So I cut some thin plastic I had on hand to use as spacers. Afterwards I read that that is more for floors.
Sorry, but you've seem to exhausted my supply of knowledge.