Patent ID: 8680168

Claim:
A process for filling a cavity to provide an air barrier and insulate within said cavity with a frothable polyurethane or a polyisocyanurate foam system without bowing an interior wall of said cavity or seep from cracks at a bottom of said space prior to foaming, said process comprising the step of: adding a two-component polyurethane or polyisocyanurate foam to said cavity, said foam comprising an effective amount of at least one non-flammable blowing agent, and wherein more than one blowing agent is used, each of said blowing agents are non-flammable, including only non-flammable miscible blends and only non-flammable azeotropes thereof, said blowing agents comprising formula (I): [CV a ] m -A-[CX b ] n —B—[CY c ] o -D-[CZ d ] p wherein C is a carbon atom; V, X, Y and Z are independently selected from the group consisting of H, F and Cl; a & d are independently selected from the integral values ranging from 0 to 3 inclusive; b & c are independently selected from the integral values ranging from 0 to 2 inclusive; o, p & n are equal to 1; m is selected from the integral values ranging from 0 to 1 inclusive; A, B and D are covalent bonds sufficient to satisfy the available bonding sites of adjacent carbon atoms, if such carbon atoms are present; each of said blowing agents and non-flammable miscible blends and non-flammable azeotropes having a boiling point between approximately 5-50° C., and an ozone depletion potential of not greater than 0.05; said foam system having a reaction profile gel and tack time which is less than approximately 90 seconds.