1. When building a shower curb on a concrete slab I have opted to go the brick route as opposed to the 2x4 route. I understand how to affix the bricks to the slab, however I haven't been able to find a solid answer on what I am supposed to use to affix the vinyl water barrier to the outside of the curb (bricks) as well as the metal lathe used to form the curb over top of the vinyl.

2. Also on a concrete subfloor, do I need to lay down tar paper / metal lathe to give the pre-slope something to grab onto? If so, what is the proper way to secure these two items to the concrete? I've also read that you can just use thinset to have the existing slab bond to the pre-slope.

Appreciate the help in advance!