During an air seal, a polyurethane expanding foam is prayed around fixtures and walls that air may flow freely through. This eliminates air leaks from the home.
After the air seal, cellulose insulation is blown into the space to help keep inside temperatures, inside.
Dense Packing - Cellulose Insulation
Small holes are cut into the side walls of the home and are filled with insulation from the foundation up.
After the walls are filled with insulation, the holes are sealed off and the siding is replaced.