In the roof reference level and offset dialog select a value for level.
Roof by extrusion.
The highest level in the project is selected by default.
The roof by extrusion tool creates a roof by extruding a profile that you sketch.
Creating a roof by extrusion duration.
In this project if you want to create an arched canopy on the west face of the building.
This is a handy tool when the roof you are trying to create cannot be defined simply by sloping the roof up from an edge such as when the cross section of the roof is curved.
How to create a roof by extruding a profile.
Specify the work plane.
Revit roof series part 1 roof by footprint duration.
The roof by extrusion tool is used to create wave form type roofs you create a sketch of the upper profile of your roof in a side view i e.
Display an elevation 3d or section view.
Elevation of section you can select a reference plane to sketch your profile on as long as you have a named one in your model.
Creates a roof by extruding a profile that you sketch.