Shower mud bed assembly — layered cross-section from the wall to the center drain
A shower floor is two mortar beds, not one: a pre-slope under the liner and a finish bed on top. Both slope ¼″ per foot to the drain.
What this diagram shows
Cut section of a shower floor showing five layers from the bottom up: subfloor, a pre-slope mortar bed sloping ¼ inch per foot to the drain, a PVC pan liner that turns up the wall and drains through weep holes, a finish mortar bed (dry-pack) that is 1½ inches minimum at the drain and thicker at the wall because it slopes, and tile set in thin-set on top.
Floor Mud Calculator
Free floor mud / deck mud calculator. Bag count, mortar bed volume & cement-sand ratios for shower pans, pre-slope & flat floors per ANSI A108.1A.
