11-033 InsulStar® 1.7SmartSPF is a two component, self-adhering, seamless, closed cell, spray applied polyurethane foam system. This system has been formulated with highly insulating HFO as the blowing agent. The InsulStar® 1.7SmartSPF insulation system is suitable for application on the interior building envelope of Type I, II, III, IV, & V buildings as well as other insulation applications.