Anyone have experience installing attic stairs in a finished ceiling. I plan to put the stair in the hallway and it requries a 22x54 rough opening. I would like to minimize disruption to the existing ceiling. I figure I need to cut back 3-joists 1-1/2" from the opening to install the stair framing. Would you just cut away drywall and cover with trim, or try to cut back the joists without damaging drywall?