Qual-Craft’s ladder hooks attach to a ladder and then hook over the ridge of a roof to provide a secure foothold on steeper-pitched roofs. The pictured model also has a wheel which allows you to roll the ladder up the roof rather than slide it.
The Ladder Hook hooks around the second-to-the-top rung; a rung clip which can be tightened with a wing nut secures it to the top rung. It’s adjustable and works with wood, fiberglass, and aluminum single or extension ladders with round or D-rungs. You’ll need two of these ladder hooks per ladder.
QualCraft doesn’t recommend using their ladder hook on roofs with ridge vents. Pricing for the ladder hook with roller starts at $21 each, but remember you’re going to need two.