I'm trying to make an interlocked roof out of a double wall for my map, but I have no idea what to stack in order to achieve the proper elevation. I tried barriers, those were too short.
How high of a ceiling do you want, and do you want it slanted or not? I'd love to give my advice, but I need more information.
I don't see what you don't understand. My walls are as high as a regular wall; which happens to be the height of a double box. I would just like to know if you have any suggestions for the stacking objects. EDIT: Nevermind this, since you just edited your post...
You want the roof to be vertically interlocked with the walls? Put a sender node then stack two walls flat on top. The roof will be slightly interlocked.