I am finishing the room above my garage. The room has a knee wall and then a 45 deg slope to the ceiling. Consequently, the ceiling is fairly narrow. It ends up being slightly less than the width of 2 sheets of drywall. Side by side, i would use a full 4' wide and a cut 3' wide piece. should i altnerate which side of the ceiling i put the cut piece, or is it okay to have the one long seam down the length of the room. I want to note that these sheets are running perpendicular to the roof trusses.