I am remodeling, and adding onto, a single-story, single-family residence. The client wants a completely new look for the roofline. First, I created a simple model of the as-built conditions and then set out to add new roof planes over the top of the existing. In some cases, it is necessary to remove an entire plane; but, for the most part I am removing pieces of a plane. In Revit, I do this by using the roof opening tool (even though the opening may extend to--an beyond--a roof edge). This allows me to "carve-up" the existing roof considerably--and, with great precision--as is necessary to work with the new roof.

While this system works quite well, now, I need to be able to explain the new-versus-existing construction to a contractor so that he can understand and construct the resulting design. The question then is: How can I go about distinguishing New and Existing construction in a demolition drawing and a new drawing (or maybe a single, combined drawing)? Is there a way to show (shade, dash, etc.) the Revit Roof Openings as demolished construction?