Master Bath Remodel - Below is a properly built traditional shower. If your on a wooden subfloor, you will put down tar paper or plastic (to keep the wood from sucking the water out of your mud) and then staple or nail down expanded diamond mesh. Please note that the studs are not notched in the dam corner pic. as this room received floated mud walls, but you will want to notch yours and set the blocking back. You don't want your walls to swoop out over the liner and it's folds.