At RetroFoam Iowa we Install the Best Insulation for Existing Homes! RetroFoam injected foam wall insulation saves you money on your energy bills. It also makes your home quieter and more comfortable. Injectable foam insulation seals even the smallest of openings in the walls of your house; which makes it an effective pest barrier. Fiberglass insulation is not as effective in stopping heat from escaping through the walls of your house. Foam insulation will fill the entire cavity between the wall studs and it will also stop the drafts around your electrical outlets and light switches. Unlike spray foam insulation, RetroFoam is non-toxic and safe for the environment.