Mansard Roof Revit

I have watched a few tutorials but none seem to be able to give a flat top finish effectively with the roof sections joining together perfectly.
Mansard roof revit. Below is an image taken from a sketch up model of the type of mansard roof that i will be modelling in revit next week. Eric wing dives into flat roofs first showing how to pitch insulation to roof drains add crickets and warp roofs to fit sloped framing. From flat roofs to fun free form roofs and everything in between hip gable mansard dutch hip combination and gambrel. This course covers the topic of adding roofs roof framing and detailing with revit.
We can learn it with watching this video.
Source : pinterest.com