I plan on modifying a switch to control a set of new recessed lights instead of an outlet. The switch is on an outside wall and I planned on routing the wiring up through the top plate, and between ceiling joists. I expect there to be insulation in that wall (the kind with a paper face, fluffy inside, and stapled).
What's the proper way to route new Romex through an exterior wall containing insulation?
Does it go behind the insulation? In front of? Does it go through the insulation?