How can you apply a gravel hatch pattern to areas of gravel (such as subfill) Material under a slab on grade), if Revit does not have it?
To quickly load an AutoCAD hatch pattern into Revit:
1. In AutoCAD, draw a rectangle or a circle.
2. Hatch the rectangle with the hatch pattern you want to load into Revit, and then adjust the scale accordingly.
3. Save the drawing.
4. Import the drawing into Revit.
5. Explode the drawing.
The hatch pattern should now be listed in your fill patterns