We have been running V-joint tongue and groove for over 20 years, and it is used on most ceilings and also for walls. We mill it in 1x6 and 1x8 Yellow Pine in either knotty boards or clear (no knots) lumber. Mostly 12 foot lengths , and we now offer to cut the 12 foot in half and tg vee the ends. This 6 foot product hauls easier and one person can install it. It also looks great with the staggered v-joint on each end and you do not have to cut it off on joists or studs.
The 1x6 is 5 1/8 face and the 1x8 is 6 3/4 face. We have a choice of 4 finishes as well. Our Sugar Mountain White finish is now exterior grade and can also serve as a primer if you want to paint over it after install.