Our Injected Foam is a product we use specifically for existing exterior walls that have little or no insulation. This is an open-cell product and is non-expanding once it leaves our spray gun. This non-expanding foam helps eliminate wall blow outs and still manages to cover most cracks and crevices (unlike blown fiberglass). Injected Spray Foam is very environmentally friendly and is a very cost effective way to insulate existing exterior walls.
This video clearly shows how the process of injected foam works. There is no longer a need to rip apart existing sheet-rock or exterior sheathing to get foam into the structure itself. It can be used to re-insulate homes that have little or no insulation, even if the wall is partially filled with old, ineffective insulation.