Roof replacement of Hangars 13, 815, 820 and 1820. Work included total system replacements at four (4) active airplane / helicopter hangars. Johns Manville modified bitumen roofing systems and tapered polyisocyanurate insulation where installed over structural concrete, lightweight concrete, metal and wood plank roof decks. Hangar 13 also included the installation of a standing seam metal mansard roof assembly. Roofing system has a 20 year “No Dollar Limit” manufacturer’s warranty