After the shower pan membrane is in place, then the wall boards go on the walls. That's the right order... the liner membrane and only then the wall boards. The best practice for building shower walls is using cement board. Here's how you do it...
The liner membrane is installed right over a sloped mortar layer and then sealed to the base of the tile shower drain. Then the liner is run right up the wall against the studs. That gives you a waterproof liner that's up the walls several inches above the height of the curb. Only after the liner is in place do you install the boars for the wall.
MEMBRANE
It is board too, as in cement boards. That's because cement boards won't rot and work well around water. Before the boards go on though, there's another important step.
Against the studs and before the wall boards, install a moisture barrier. That's either 15# roofing felt or 4 mil plastic sheet. That way the moisture that might get behind the cement boars is confined by that layer. Then you install the cement boards.
To build a wall properly, leave gaps between boards and then tape and mud the joints to produce a real sealed wall.
The other place to watch is the bottom of the cement boards. Install the boards so there is at least a 1/2 inch gap between the bottom of the cement board and the liner sheet itself? Why???
That gap is to reduce the chance of water wicking up into the cement board. Wet cement boards won't rot but they will mold. That's no good.
The shower pan membrane is the key to a tile shower that works properly. Getting the wall covering in the shower installed is the next step after the liner membrane is in place. With the materials available, it's easy to build a shower that keeps the water in the right place from the floor all the way up the walls.
There are other details that can make the shower walls last for a long time trouble-free...
Shower Pan Membrane and the Shower Wall Covering MEMBRANE
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