You can join roofs to other roofs or walls or unjoin them if they were previously joined.
Revit roof geometry joining.
Then from the modify tab on your ribbon use the join geometry command and select the 7 1 2 roof and the wall.
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.
3 adjust wall join display in view properties.
The forgotten options.
Use the join geometry tool to create clean joins between 2 or more host elements that share a common face such as walls and floors.
The wall must be attached to the target roof and the target roof must be a footprint roof.
I ve zoomed in closely here hoping that you can see.
The joined elements then share the same line weight and fill.
It will join in the wrong order and you will need to use the drop down menu next to join to switch the join order.
You can join a roof to the top face of another roof and the wall below that roof if you select the wall as the target.
This is a general.
We are around the back side of the building now select this tool in the geometry tab called join unjoin roof.
You can also use the tool to join hosts and in place families or hosts and project families.
The third and final technique to control the wall joins is to use wall join display in the instance properties of the view.