As another option to hosting the extra fascia cap to the soffit revit also allows you to host the roof.
Roof to wall line revit.
In some cases you want to see a line between two walls especially in a case where an interior wall is joined with an exterior wall.
Select the roof tool.
A common issue among revit beginners is the unability to properly control if a line will display between 2 walls.
You can see in the 3d view that this constraint moves the dormer walls up to the main roof.
Then choose attach top base 2 and finally select the roof 3.
Use pick walls if you want the roof to automatically adjust when walls are moved.
Select each boundary line and set the value in properties or in option bar.
Sketch mode is used to allow you to define the boundary of your roof.
By default all walls created in revit are joined together.
I drew a model line along the workplane of the rake and along its return back to the wall.
Next the walls need to be moved to the roof line to create the dormer.
The other element can be a floor a roof a ceiling a reference plane or another wall that is directly above or below.
After placing a wall you can override its initial top and base constraints by attaching its top or base to another element in the same vertical plane.
Once again select the wall first 1.
You can set an overhang on roofs created with pick walls.
By attaching a wall to another element you avoid the need to manually edit the wall profile when the design changes.
Create the roof of the dormer using the walls we just placed.
Revit then makes the wall meet the underside of the roof correctly.
Roof by footprint can be used for both flat and sloped pitched roofs.
Fascia to a model line.
In this video i show you how to attach the walls in revit to the roof above them.