The dashed lines that you are seeing in this plan are actually the edges of the roof element.
Revit show roof above dashed.
You notice when placing revit component families some display above the view cut plane while others like specialty equipment do not.
When a family is located above the view range cut plane but falls below the top plane the family category will determine whether it is visible or not.
The revit tool you would use to show the fittings behind the wall is on the view tab graphics panel and the tools are show hidden lines and then the opposite remove hidden lines.
Thankfully within revit there is a far more elegant solution to this problem and that is the linework tool.
Follow these steps in order to get the desired display.
Use an underlay in the view where you want to see objects either above or below.
Overlay the roof plan and this celing plan on the sheet they will snap align.
Once the underlay of the correct level is turned on set it to either floor plan or reflected ceiling plan orientation.
And now i need to set it s underlay to show the roof element.
A customer wanted to show bathroom fittings that are behind a wall in elevation so that they can plan the drainage piping for each fitting.
Define the display settings for projection lines using the object styles or the override graphics in view functions in revit.
So if you go to visibilty graphics and look at the filter tab you ll see a filter created which shows any pipe as dashed if it is below the elevation of 0 0.
Alternatively create a new ceiling plan cut just below the eaves that shows only walls and rooves with wall display overridden to dashed.
You can draw your eaves dimensions on the ceiling plan.
Showing beams and columns dashed below or above.