Control room framing question

I'm trying to get my head around how best to build the ceiling of a room-in-a-room control room with an angled ceiling. The image below would make the plasterboard easier, but I'd be surprised if rafters are allowed to be angled like that? It's a 12 degree angle. Is the only option to run them lengthways, and use an exposed beam running along the apex? Or could they butt a beam at that shallow angle?

I'm petty sure you can't do what you've drawn. I think you need to do it in pieces, vertically. Start with rectangular frames with single top plates, like you're not building an angled ceiling at all. (We call them "vaulted ceilings" in our part of the world.) Then, build essentially a triangular mini wall that will sit atop the top plates on the front and back walls. Typically, the joists would run the opposite direction and would connect with joist hangers in the middle to a beam. I'm having trouble finding an illustration that shows what I'm trying to describe. Bottom line, ceiling joists can be tipped up or down, with angled notches cut into them so that they bear solidly on top plates, but I'm almost certain they cannot be rotated a few degrees as you've drawn. --Keith :mrgreen:

Thanks Keith, Yep as you say, it looks like the correct method would to use a hanging beam at the apex and run the ceiling joists from there down to the front/back wall plates. What confused me was that there was no evidence of wall-support for such a beam in the Oasis construction pics, so I'll ask the question that I should have originally: What was the next step in the Oasis control room ceiling after the pic below was taken?

adam - I don't have a pic that follows but this shows what happens. cheers john