First, a few definitions… the terms sill, threshold, curb, and step-over all relate to the same thing. They refer to the tile immediately below the door.
The pitch, or slope, is very important to the performance of your frameless shower enclosure. If the tile is improperly sloped, your shower is likely to either leak or permit water to stand in pockets rather than flow into the shower enclosure.
Below are schematics which help explain the issue:
Shower sweeps won’t seal to the sill
Water drains outside the shower enclosure
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