A shower pan is a custom formed cement “packed” base at the bottom of your shower for the tile to be installed on. A watertight surface is created by applying a pre-slope using dry pack sand mix topping cement. Then a PVC liner is set on top of the pre-slope. Another layer of Dry-Pack cement is formed to a slope towards the shower drain. A Curb is formed on the outside portions of the shower-pan to retain water. A waterproofing membrane is then applied to the surface of the shower-pan readying it for tile installation.