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.
Revit roof geometry joining.
You can also use the tool to join hosts and in place families or hosts and project families.
The wall must be attached to the target roof and the target roof must be a footprint roof.
3 adjust wall join display in view properties.
The third and final technique to control the wall joins is to use wall join display in the instance properties of the view.
You can join roofs to other roofs or walls or unjoin them if they were previously joined.
The joined elements then share the same line weight and fill.
I ve zoomed in closely here hoping that you can see.
This is a general.
You cannot join a roof to more than one top face of another roof.
Then from the modify tab on your ribbon use the join geometry command and select the 7 1 2 roof and the wall.
We are around the back side of the building now select this tool in the geometry tab called join unjoin roof.
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 forgotten options.
As shown in the following illustrations the tool removes the visible edge between the joined elements.