Except for that slope the floor itself might be flat.
How to make a sloped floor.
You can create sloped floors in the building model.
Make sure you place it within the boundary of the floor element.
Use one of the following methods.
As soon as you place the point revit resolves the new surface by triangulating it.
If we switch to a 3d view it is far easier to see what is going on.
Specify a value for the offset from base property for parallel floor sketch lines.
Mark this outer height mark along the wall with a pencil.
Mix up some concrete mix in the mixer.
For example a floor that extends 4 feet away from the drain should have 1 inch of overall slope.
Specify a value for the defines slope and slope properties for a single floor sketch line.
You can envisage that this point may represent a drainage point in our floor that we want to slope down to.