The dashed lines that you are seeing in this plan are actually the edges of the roof element.
Revit hide roof lines.
Revit displays the modify linework contextual ribbon.
This makes the roof line visible in the plan view but the lines appear as solid lines.
Select the linework tool in the view panel on the home ribbon.
On the view control bar click reveal hidden elements.
I am working in revit mep 2013.
The reveal hidden elements icon and the drawing area display a color border to indicate that you are in reveal hidden element mode.
All hidden elements display in color and visible elements display in half tone.
Do one of the.
Select the desired linetype from the line style type selector.
Example to unhide hidden elements select the element.
Click on each roof edge line to change the linetype.
Hide in view hide elements hides an element from view.
It is just that now they are set to be visible rather than hidden.
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Take a temporary look at hidden elements or unhide them.
Window places a window in a wall or skylight in a roof.
The roof is linked in via an architectural model but i believe the architect modeled it with the modify sub elements tool.
After using the show hidden lines tool to display lines of model elements and detail elements that are obscured by other elements you can use remove hidden lines to reverse that setting.
When i just build a roof in a blank file and turn off the interior edges none of the valley or ridge lines turn off.