OSI, 21.1 OZ, Quad Foam Window & Door Installation Foam, Single Component Polyurethane, Minimal Expansion & Low Pressure, Seals Gaps, Cracks, Holes & Voids Around Windows & Doors, Closed Cell Structure Provides An R Factor Of 5 Per Inch, Adheres To Wood, Concrete & Drywall, Compatible With Asphalt & Butyl Flexible Flashing, Specifically Designed For Use With The OSI Quad Window & Door System.