Mercy Hospital in Cadillac, Michigan Written by dewardknapp on March 20, 2019. Posted in Replacement Roof. PVC Roof Replacement with Insulation Removing the old roofing material at Mercy Hospital in Cadillac, MI.Gravel is used on many flat roofs. Mercy Hospital has complex ventilation and utility equipment on the roof that must be accommodated.Some of the complexities of the hospital roof can be seen in this photo prior to the commencement of the PVC roof installation project.Installation of the Sika Sarnafil PVC roof on one section of the hospital in Cadillac.Technicians installing the new PVC roof and rigid insulation.Through the roof vents and rain drains are visible in this photo.Flashing and waterproofing the ventilation ductwork on the roof of the hospital in Cadillac.Typical flashing and waterproofing of vertical surfaces for the PVC roof.Electrical services also require special treatment to seal the PVC roof.View of one of the lower roofs.Another view of one of the lower roofs.Exhaust blowers seen on a mid level roof.White Sika Sarnavil PVC roofing extended onto ventilation ductwork. Previous Next