In residential architecture, as well as other types, it is often a required part of the working drawing set to be able to show the roof overhang as a hidden line on the floor plan views. Out of the box, Revit doesn’t do this because Revit shows it as it’s built. Some may call this WYSIWYG or, what you see is what you get. Meaning that in the real world we don’t see a dashed lines on the ground so we know there is a roof above. To get Revit to do this there is a simple work around that I have outlined below.