In my experience the roof tool is still a mystery to many revit users.
Revit 2016 roof tutorial.
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Tutorial on roof construction modeling in revit.
On the draw panel click line.
Highlight the main roof on the building model and click to select it.
Modify a roof after creating a roof you can change its shape or overhang cut openings or align ridges.
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Watch the status bar to be sure that you are highlighting the main roof.
Roof slope you can define the slope of a roof using various methods.
Click architecture tab roof drop down roof by footprint.
Click architecture tab build panel roof drop down roof by footprint.
If you try to add a roof on the lowest level a dialog prompts you to move it to a higher level.
If you choose not to move the roof to a different level revit notifies you later if the roof is too low.
Monday may 23 2016.
Join roofs you can join roofs to other roofs or walls or unjoin them if they were previously joined.
On the options bar verify that defines slope is selected.
Draw a roof line.
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Valid boundaries are highlighted.
Place the cursor in the drawing area.
Creates a roof by extruding a profile that you sketch.