I have a situation where there is some wooden trim deteriorating on a house that is otherwise hardi-plank. This trim is located right under the shingles of the roof, its the small 5/8" X 2" wood trim all around the roof. The area is on the upper gable of the roof, on a 2 story house, and the only access is by standing on the first level of roof, whose slope is okay for standing on, but not sure about placing a ladder on. I cant reach the trim piece by standing, its just too far out of reach, so I have to use a ladder I guess. Is there any way to support a ladder or block the legs, or tie it off to prevent the feet from slipping on the slope? Its a good aluminum extension ladder with the rubber footed grip treads on the ends, but I was thinking nailing a 2X across the lower roof, to rest the bottom of the ladder against to keep it from slipping on the slope of the lower roof, but dont want to poke holes in my roof with nails, so any ideas? I heard a roof jack, but dont know what that is. I do appreciate your wisdom.