Hi all, I need a bit of help from someone that might actually know what they’re doing. I’m just about to plasterboard a lowered ceiling in a pitched roof. Am I ok to use a square edge sheet of plasterboard against the sloped roof or will I need to cut the edge of the plasterboard to match the angle of the roof? Without adjusting the boards I will be left with a small gap between the bottom of the board and the wall. Only a couple of mm.