Abstract: A device for securing a ladder to a ladder rack comprises a first pole segment, a second pole segment substantially parallel to and shorter than the first pole segment, a connecting segment therebetween, and a clamping bar slidably engaged with the first pole segment and selectively slidably engaged with the second pole segment. The clamping bar comprises a trigger handle. The device may be placed around a portion of a ladder and a ladder rack. Repeatedly pivoting and releasing the trigger handle moves the clamping bar proximally-to-distally along the first pole segment such that the clamping bar slidably engages a proximal end of the second pole segment and then tightens against the ladder rack, thereby securing the ladder to the ladder rack.

Abstract: A roof scaffolding support system comprises two ridge hooks, two cables, and two roof jacks. Each ridge hook comprises a generally J-shaped bar and a cross-bar at a distal end and perpendicular to the J-shaped bar. Each cable comprises a main flexible portion and a plurality of spaced-apart nodules on the main flexible portion that are larger than the main flexible portion. The base of each roof jack defines a slot having an open end for selectively receiving one of the cables to selectively secure the base to its corresponding cable. The slot has a width that is (a) greater than the main flexible portions of the cables and (b) less than the nodules such that the main flexible portion of each cable can pass through the slot of its corresponding base but the nodules of each cable cannot pass through the slot of its corresponding base.