Foam Comfort uses a Closed Cell 2 Pound Polyurethane Spray Foam insulation. It is Sprayed into a cavity or on to a surface, in walls or on ceilings where ever traditional insulation would be used. As a result, it helps to keep the heat inside during the cold months and the hot air outside when it’s warm. Think of it as a thermal envelope. While regular fiberglass insulation can be easily installed by the homeowner, spray foam insulation isn’t a do-it-yourself project. A professional will need to be called in.