When you join geometry in the family editor you create a union between different shapes.
Revit joining two different roof profile.
I believe this tools are not design for this purpose.
In a project however one of the joined elements actually cuts the other according to the following scheme.
Load the profile we created before.
Sketch the profile of the roof as an open loop.
My final step is to clean up the intersections.
Using the reference plane you can control the position of the extruded roof in relation to a level.
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You can load it by accessing revit menu open family.
But i m not really sure if this is a best practice.
Give a relevant name such as roof slab edge profile.
For creating complex roof it might be easier if you create separate roof then use join roof tool to join them later.
Revit places a reference plane at the specified offset.
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Floors ceilings and roofs cut walls.
Using shape editing tools.
This is the easiest way to do it.
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.
Now open your training file.
You can join roofs to other roofs or walls or unjoin them if they were previously joined.
I then drew a second roof with a 7 1 2 thickness on the inside of the first by using pick walls with extend into wall to core checked on and no overhang.
You need to create the bay window roof separately.