how do you do it? i have done it by scoring every 2 inc then snapping the board to get around a curved ceilling. i heard a mate of mine say he dampend the paper on the board and leand it agains a wall over night but what if the board is 2-3 feet and would not have enough weight in it to bent itself. please explane how you would all do it if you were curving a ceilling on to joists about 2-3 curve.