The project consists of the complete replacement of some roof areas and repair & overlay of others, as well as the replacement of clerestory window glass throughout the building. In overlay areas, the existing damaged roof system is to be removed & replaced with materials to match. The overlay system to be applied is 2-ply modbit membrane on coverboard. The replacement areas will receive a 2-ply mod-bit membrane over tapered insulation on 2-layers of 2 poly-iso insulation. New flashings & metal will be provided at all work areas, as well as new roof hatches & access ladders. The existing metal frames of the clerestory windows will remain. Glass panels are to be replaced, from the roof surfaces, with specified glazing.