<p>A modular roof installation scaffolding system comprises a plurality of light-weight, generally rectilinear rails having a plurality of regularly-spaced apertures extending laterally therethrough. The rails are supportable upon a plurality of feet adapted for pinned connection to the rails utilizing the apertures. One or more jacks are slidably supportable on the rails and are adapted for pinned connection to the rails. The jacks are adapted to support one or more planks extending orthogonally to and across the rails for supporting one or more roofing installers thereon. A roof hook is attachable to each rail for supporting the scaffolding on the roof at the ridgeline of the roof.</p>
