Wonderboard on top of concrete for shower
Hi guys. I'm another brave soul, sticking my neck out to learn how to install a shower in my basement. It's on a slab and already stubbed for shower and toilet. I've got it framed in, greenboard up on the upper walls, greenboard over a 2x4 stacked ledge to step over and I'm getting ready to put a shower pan liner in. But I know from lots of research online that I need some help here.
First, I need to know how to cut the shower drain open (capped)--with what? I can get the drain installed just fine once I get the thing open! Yes, it's a Ptrap under there... I checked with the builder.
Second, I'm very confused about the floor prep. I've seen videos that show wonderboard being put down, then concrete being poured on that to get the slope in before roofing felt, shower pan liner, mortar, mortar and tile. Is that necessary on a concrete floor? Or can I just build the slope with concrete (and does it have to be reinforced with chicken wire?) and go from there?
Third? I'm also getting mixed messages on the application of the shower pan liner? Is it glued to the floor surface, and if so with what?
I'm trying to do this just RIGHT from the beginning, because I don't plan on having any leaky problems down the road! Thanks for any advice you have.