I know the general rule is to run the ceiling perpendicular with the joists. I'm about to start a ceiling that was completed firred down with 1 x 2 perpendicular to the joists. Should I run the rock perpendicular with the strips now or still go perpendicular with the joists? I'm using 1/2" sheets, should I increase the screws to 1 1/4" since I'm not going to screwing directly into the joists?
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