Summary: RoofSnap's software automatically detects overlapping roof facets and includes those in your measurements. Draw the overlapping facets in your projects sketch and click the "Facets" tab on the upper toolbar to verify that there is double-shading on the overlapping section.
Watch the video below to see the process:
Note: Small overhangs like cornice returns may require that you zoom in, turn off 90 mode, or "draw and drag" facets include them in the sketch. See how to draw cornice returns here.