If necessary use the viewcube to spin the design to facilitate selecting the wall or roof edges.
How to join double pitch roof in revit.
Then follow these 2 steps.
Click modify tab geometry panel join unjoin roof.
Select an edge of the roof that you want to join and then select the wall or roof to which you want to join the roof.
We want to join this face to the roof.
You can use height or slope value specify the method and the constraint values from properties palette.
Use it to extend the dormer roof to the main roof.
This tool is located in the modify tab.
Http pbl stanford edu how to attach walls to roof objects in revit.
Using shape editing tools.
1 check define slope to create a sloped roof.
With the join unjoin roof tool selected you need to click on the line of the roof which is on the face of what you want to join to the other roof.
9 join roofs add opening to create dormer.
Revit roof slope can seem complicated at first glance but by learning a few critical features you can create any roof shape you desire.
For creating complex roof it might be easier if you create separate roof then use join roof tool to join them later.
Use join unjoin roof tool.
Whether you want a double gable roof with 6 pyramid shaped dormers or a simple gambrel roof the basics remain the same.
Then draw the arrow to define the slope direction.
Groin vaults for your single groin needs 3 create a flat roof no edges defining slope then use the roof shape editing tools add split line set heights see attached revit file.