So I am aware of blown in or expanding foam insulation. I don't want to make a mess and buy the equipment to do this. My question is if I cut a 4x8 section out of the center of a wall would I be able to fish it up to the ceiling and down to the floor behind the sheetrock I leave in place? I plan on splitting the difference from floor to wall so about 2 ft up from the floor and down from the ceiling. The 8' would go side to side. I feel this should be doable and wonder if anyone has done this?