I have a one story ranch. I would like to raise the ceiling in my living room 18 to 24 inches. The room is about 15 feet square. The ceiling joists are 2x6. The wall height is 8 feet, I would like to come out straight about a foot around the perimeter then shoot up 18 to 24 inches at a 45 angle along the perimeter then flat across the center. Creating an upside down tray. I what the center to up about 9 to 10 feet high.
Questions: Has anybody done something similiar? Structurally what should I look for and how would something like this be done? Should I collar tie across then connect up or can I construct some type of plywood 2x6 sandwich to create joists that go up and then back down?
Is this "do able" or am I just nuts?
Thanks in Advance