Dow Froth Pak 650, Spray Foam Insulation Kit, Class A fire rated 650 sq ft Fills cavities, cracks and expansion joints for insulation & air sealing Stops energy loss by providing R-6.5 rating per 1 inch of thickness Can be used to insulate stud wall cavities up to 2" thick Kit yields up to 650 Board Feet of Foam, 1.75 foam density Dow- A Brand you can trust with More Board Feet per kit than the competition