seeking advice on what the best/effecient way to insulate this cavity. my only access is through a gable vent, which is probably about 11x14 inch. not crawable. pictures below show me looking through the gable vent. the space is approx 9ft x 4.5ft. looking straight ahead at the dry wall is the wall of the living room. directly below the sheet rock is the ceiling for the entry hall upon entering the house. the roof decking is above.
i thought about spray foaming the dry wall and blowing in fiber glass for the top of the sheet rock or spray foaming everything minus the roof deck.