Scaffolding system

A side rail system for interconnecting layered sections of elongated scaffold staging which sections respectively span pairs of upper and lower support arms of pump jacks respectively riding on spaced apart pump jack poles, each section of scaffold staging including longitudinally spaced transverse hollow rungs, said side rail system comprising upright posts for positioning along the staging, a pair of rods associated with each post, said rods being slidably received within the hollow rungs so as to be confrontingly projecting from the respective upper and lower staging sections, said rods havng stop means at one end thereof for preventing complete passage through the hollow rungs, coupling means for pivotally connecting each post to the projecting ends of the associated rods to permit angled positioning between the post and the rod, removable guard means for preventing separation of the coupled posts and rods, and rail means longitudinally extending between said plurality of posts.