Home » Portfolio Items » Osborn CommonsOsborn CommonsOsborn CommonsOsborn CommonsOsborn Commons Industry Housing Location Sault Ste Marie, MI Sq Ft 22500 Type New Construction System Duro-Tuff Base insulation of 6” ISO. Tapered insulation at Terrace Roof, Stairwell, Elevator Shaft, and saddles between modified drain locations. 60 mil Duro-Tuff PVC membrane and flashings – mechanically attached. Steel copings. All roof penetration flashings. Walk track protective mats as shown. Contact Us