If you look at this diagram [URL="http://www.extraordinaryimage.com/bathceiling.gif"]www.extraordinaryimage.com/bathceiling.gif[/URL] you can see a diagram of my bathroom ceiling and joist placement. The length of the room is 9', and I initially put up an 8' long sheet of drywall which ends between joists at the spot shown on the diagram. I had planned to try back blocking that seam to make the butt joint disappear. After I cut the remaining one-foot piece I realized that I would only have the one true joist to nail it to, plus the nailers on the top plate of the partition wall which aren't terribly sturdy. They have some give to them. My question is this: Is the above plan bad? Or is the very short piece of drywall ok with just one joist and the end nailers? Should the smallest drywall sheet be nailed to at least two joists? If so, I could cut the large piece back to either the second joist away from the wall, or a full 16" and still make the seam fall between joists so I can back block. My main thing is I just don't want the seam to crack due to poor installation technique. Thanks

I have a pony wall with a 90 degree corner. I plan to use rounded sheetrock corners on it. What do I do where the two vertical and the horizontal corners meet to get a rounded outside corner?