(Also see Mud Bed)
The slope (pitch) is the gradual descent in the angle of the shower floor. Slope is an essential component in shower floor construction because it guides the flow of water towards the drain. A sand-and-cement mix such as MAPEI 4 to 1 Mud Bed Mix typically serves as the material for the mud bed, which is used to create the slope on the shower floor.
Slope is also a critical component in successful exterior installations. It is very important for rain water to quickly drain off patios and balconies. If water remains stagnant, severe efflorescence issues can occur. When the flow of water is not moving away from the home, it can also increase the chance of moisture entering the home, which can create more serious issues.
Note: The industry standard for shower slopes is a range of 1/4″ to 1/2″ per foot. With certain installations such as ADA barrier-free showers and standard shower stalls with three-dimensional pebble tile and river rock mosaics, the minimum 1/4″ per foot slope may be insufficient. A steeper slope may be required in order to facilitate good drainage.