The first attachment shows how i normally do it with slope defining lines near the roof drain with the tapered insulation roof element either extended to the main roof or just sketched out that way.
Revit tapered roof.
The standard tapered panel size is 4 x 4.
Then follow these 2 steps.
Revit tapered roof cricket with in place sweep blend cadclip duration.
I used 1 8 and 1 4 sloped pieces on a 1 4 sloped roof.
The second attachment shows how it s actually constructed with 1 2 tapered boards.
You can use shape editing tools to manipulate the surface of a flat non sloped floor or roof by defining high and low points for drainage.
By specifying the elevation of these points you split the surface into sub regions that can slope independently.
Standard material is johns manville enrgy 3 tapered and flat polyisocyanurate roof insulation.
Shape edit examples use shape editing tools to slope a constant thickness floor or the top surface of a floor with a variable thickness layer.
Use it to extend the dormer roof to the main roof.
Technonicol plugin is a revit program add in that contains tools designed to create slopes on a flat roof using tapered insulation sandwich construction leaders as well as catalogs of building systems materials and sketch books of connections.
9 join roofs add opening to create dormer.
Revit adjust drainage slope of flat roof duration.
Use join unjoin roof tool.