The use of outdated cellulose and fiberglass in the outer walls of your home is not sufficient to provide an airtight environment. The situation is even more dire if you do not have any insulation; there is nothing that can prevent the air from entering or the heat from leaving. Insulation consisting of injection foam generates an air seal that will prevent air from moving about. When you put an end to that air leakage, it can have a significant impact on the level of comfort in your home as well as the energy efficiency of your home.
Most spray foams are made when two liquids combine, causing a chemical reaction to form the polyurethane foam.