trimming t&g at ridge
hi all - looking for advice. I have a t&g pine vaulted ceiling, approx 30' ridge / gable ends. Short collar ties are right under the ridge and these may be covered in same t&g material. The collar ties are for code / uplift, and I have rafter ties down below (top plate) which will be boxed in later.
The transition from sloped ceiling to the horizontal plane (collar ties) is where I'm focused. Not sure if I should:
1) bevel the top ceiling board edges (plumb), and butt the edges of the horizontal boards against that?
2) bevel the outside edge of the horizontal boards (angled to the ceiling plane), to cover / hide the top edge of the ceiling boards?
3) scribe anything?
4) just use trim?
Worried that option 1 or 2 may leave a gap if the wood shrinks a bit (which I think is likely when the dry winter air hits), or anywhere that the boards aren't butting together "perfectly" along the transition
Scribing - I would probably waste a lot of material trying to do this.
Trim seems like my best bet from a stay out of trouble perspective (although this may cause some of you carpenters out there to cringe a bit). Maybe some 1x2 or similar at the transition? Possibly rip / bevel some kind of stock trim to make a nicer looking job? I'm just spit-balling - any suggestions on how to do this would be very much appreciated.