If you want to change the position of the roof use the properties palette to edit the base level and offset properties to change the position of the reference plane.
Modifying points in revit for roof plan.
Add a negative value to the middle points and a slope is created.
Use the modify sub elements button to select your newly placed points.
Add point or split line if better suited creates points at intersections place your new points as required.
Select the linework tool in the view panel on the home ribbon.
Select the roof and click modify roofs tab mode panel edit footprint or edit profile.
The tail is the low point and the head is the high point.
In the example below we add a bunch of points and change their relative height with modify sub elements tool.
Edit the roof sketch.
Draw the arrow then click it and change the properties to select the right levels and offsets.
If you found t.
The elevation edit box displays on the options bar with a relative check box next to it.
Select your flat roof press the modify sub elements button that appears.
Revit displays the modify linework contextual ribbon.
Select the floor or roof to modify.
Add a negative value to the middle points and a slope is created.
This create an uni directional slope parallel to the arrow.
The points are used by the shape modification tools to change the element geometry.
This makes the roof line visible in the plan view but the lines appear as solid lines.
Click on each roof edge line to change the linetype.
This video shows you how to add a split line and a point to a flat roof so that you can edit the roof to allow for drainage channels gulleys.
Some typical scenarios are the include the outline of the perimeter of the roof the outline of an entrance canopy roof light positions etc.
Make sure define slope is inactive and that the arrow lies on the boundaries.
Select the desired linetype from the line style type selector.
Click modify floors tabshape editing paneladd point.
We could of course just draw these on the appropriate floor plan views using detail lines which would certainly get the job done.