Having a bit more of a play you probably want all of the walls to be set the same.
Gypsum priority = 8
Stud priority = 10
Air space priority = 6
All the walls in the attached image are set like that.
Except the single wall at the bottom of the double stud wall.
This is the only different one that has the gypsum on the reference side set to a priority of 12.
But take not of how you trim the walls together.
They all seem to work quite well if you let Archicad trim them automatically.
The two single walls that dont trim to the double wall were forced to trim to the non-reference side and they don't trim the skins properly.
I hope this helps more than confuses.
Barry.
One of the forum moderators.
Versions 6.5 to 27
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