This project generally consists of the demolition, repair and/or replacement of the roof systems of the Coordinated Science Lab (0148) and the Materials Science & Engineering Building (0034) at the University of Illinois Urbana- Champaign (UIUC).Base Bid CSL: Includes the preparation and coating of all existing metal roofs, replacement of the existing skylight system, new ladder and walkway access at towers and around skylight, replacement of all existing gutter liners and flashings, and replacement of all low slope roofing systems with new membrane roofing assemblies. Alternates include full slate roof replacement at MSEB (Alt. #1), replacement of all flat roofing systems at MSEB (Alt. #2), and replacement of all standing seam metal roofing at CSL (Alt. #3).