There are a lot of different combinations that could hold the membrane in place like glue or nails gravel or rubber.
How to make different kinds of roofs revit.
Then follow these 2 steps.
In architecture tab select roof roof by footprint tool and choose desired roof type.
Choose a relevant level for a bottom face of the roof.
Use pick walls tools and hover over a wall press tab to select all joined perimeter walls.
This tool is located in the modify tab.
Then copy and paste the embed code into your own web page.
Use it to extend the dormer roof to the main roof.
To embed this screencast choose a size.
Get these project files and all advanced 1h courses.
9 join roofs add opening to create dormer.
Tutorial on roof construction modeling in revit.
See hd version of video tutorial here.
Use join unjoin roof tool.
To create a dormer model required walls and additional roof.