Shower walls prep for tile
Hello, we are doing a home addition with a new master and master bath. The master bath has a shower with a bench in it. Our GC has hotmopped the shower (we are in CA) and it looks good. Now I started doing research and it looks like Bill V and others recommend some sort of cement backerboard with Hydroban onto which the tile is floated?
I talked to my GC about it and he says that what he does is to put down a lath, tar paper and mud that (I hope I'm getting his terms right). His words were "I'm old-school and that has worked well for a long time".
I did a bit of looking around and it sounds like the there are some who do the hot-mop + lath-tar-mud combo, but that's the old way. The problem is that I don't know enough about this to even question him on it. Does that seem like a suitable way to prep a shower wall? Anything in particular to be careful of with this method?
We'll be using 6"x3" shower tile if that matters.