Thanks about this picture !
You are able to connect wall with shell or roof by this way :
Right clic after selecting roof and wall and clic on "single-pan roof connection"

It is possible to connect shell/roof with wall/curtain wall too !
Christophe - FRANCEArchicad Designer and Teacher
Archicad 15 to 26 FRA FULL
OS 11.6 Big Sur - MacBook Pro 2015 - 16Go RAM
"Quality is never an accident ; it's always the result of an intelligent effort" John Ruskin