Even in revit 2019 it still seems to use the bottom material for the edge appearance.
Add material to one face of floor revit.
You can place slab edges in 2d views such as plan or section views or in 3d views.
Add a floor material use split face add another material.
Add a floor slab edge you add slab edges by selecting horizontal edges of floors.
This video was recorded using revit 2018.
Make sure the preview pane is open and the view is set to section.
Add or remove segments of a floor slab edge.
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This video demonstrates the following.
The paint tool applies a material to the selected face of the element or family.
Resize or flip a floor slab edge after adding a slab edge to a floor you can change the size or orientation of the slab edge.
In the associate family parameter dialog select a parameter or create a new one.
If the element highlights when you place the cursor near it you can.
Split a wall face.
You can assign a different material to each part of the component.
The following image shows the carpet material applied with the addition of an image file in the image slot in the revit material editor to create a patterned carpet.
On the properties palette for material click in the value column and click.
Understand when to use the split face and paint tools.
Activate the default 3d view and select one segment of wall in the view.
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From the properties palette click edit type and in the type properties dialog box click the edit button in the structure field to open the edit assembly dialog box.
In the drawing area select the geometry to which you want to apply a material.
Example before painting applying material to stairs after painting applying material to stairs elements that you can paint include walls roofs massing families and floors.
In the upper right of the edit assembly dialog box change the sample height value.
Paint a wall section with an alternate material.
Apply a different material to an element section without altering the family definition or adding a new family to the model.
When using a newer software release you may notice.
Not really true to the bim concept though would be much better if revit just showed the layers properly.
Where edge appearance matters i have made a work around by adding a membrane layer at the bottom with thickness 0 using a visually suitable material.
There are two keywords for this material long carpet and short carpet.
Find revit materials for paint flooring roofing ceilings decking coatings and more.