Living wall. I have a few questions. Anyone tried one?

[DirtyCoconuts]

I have a apace in my bathroom that I want to make a living wall.

I want it to be 36” wide x 30” tall and I am going to use a few wall planters and hygrolon as the wicking mechanism and rooting area. My questions are about how I can make a barrier against the wall?

I was also think about using the square fencing pvc as the frame to avoid the possibility of rot like I would have with wood

Anyone ever try this? Any thoughts on a moisture barrier? I was thinking visqueen, plexiglass, ???