Use: Ability to extrude roofs from vertically planar surfaces.
Command location:Home tab > Build > Roof dropdown, options: by footprint, by extrusion, by face.
Where:
Must be in a plan view, preferably a Roof plan view that you previously created.
Start command:
Select by Extrusion, use the pick a plane option. Select a vertical face desired, for example a roof fascia. Select desired Level association in the following prompt.
Sketch the line in the shape you want the roof to be. Set extrusion depth in the properties. Finish Sketch.
Connect the new roof extrusion to the existing roof with the Roof Join/Unjoin command.
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