Click modify tab geometry panel join unjoin roof.
How to join double pitch roof in revit.
To create a dormer model required walls and additional roof.
Whether you want a double gable roof with 6 pyramid shaped dormers or a simple gambrel roof the basics remain the same.
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.
2 roof by extrusion needs to be cut and use multiple pieces as it turns corners this link explains a similar process fear and loathing in a cad vs.
Use it to extend the dormer roof to the main roof.
Http pbl stanford edu how to attach walls to roof objects in revit.
For creating complex roof it might be easier if you create separate roof then use join roof tool to join them later.
This tool is located in the modify tab.
Then follow these 2 steps.
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.
Use join unjoin roof tool.
Then select the face of the roof you want to join in to and then.
Using shape editing tools.
Then draw the arrow to define the slope direction.
1 check define slope to create a sloped roof.
9 join roofs add opening to create dormer.
If necessary use the viewcube to spin the design to facilitate selecting the wall or roof edges.
We want to join this face to the roof.