This is the method that should be used once the roof geometry design is finalised and not likely to change again.
How to make a curved roof in revit.
See hd version of video tutorial here.
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Create a simple curved roof using the roof by extrusion tool in revit.
You may have to adjust its xyz location before finishing the mass which can be accomplished in plan or elevation.
Generate revit roof in revit create a new mass and import the sat file from the previous step.
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Attach revit beam to curved roof using the standard beam tools.
The simplest way to create a beam that attaches itself and follows the curve of a roof above is by using the beam draw tools.