I am planning to create a doorway/arch in an internal wall of lightweight concrete in our house. The wall runs perpendicular from the long side of the house towards the chimney. When I opened up the ceiling, I see that the roof truss is about 1 decimeter beside the wall and not on it. The only thing resting on the wall are tongue-and-groove boards coming from the ceiling in the room on the other side of the wall. See attached image.
I assume that the wall is not load-bearing in the true sense of the word, but could it have a stabilizing function? Or can one simply take down the wall entirely where the arch is to be, or should a steel beam still be used to bridge it?
Regards,
Mats