Builders have many choices for the types of insulation they use. All insulation can be effective if it is properly installed and coupled with a continuous air barrier. Insulation materials are rated according to their ability to resist heat flow. This thermal resistance rating is commonly known as an “R-value.” The higher the R-value, the better the material is at resisting heat flow. ENERGY STAR qualified homes can include one or more of the following types of insulation:
- Batt Insulation is typically made from mineral fiber (fiberglass or rock wool) and manufactured in blankets of various sizes and thicknesses. Batt insulation is typically fitted between studs, joists, and beams and should fill the wall, floor, or ceiling cavity without any gaps, voids, or compression.
- Blown-in Insulation is typically made from fiberglass or cellulose and is literally blown into the walls and attic through a large hose. Blown-in insulation should completely fill the wall cavities and be an even thickness throughout the attic.
- Sprayed or Injected Foam Products are typically made from polyurethane or similar products and are injected or sprayed into cavities where they expand to the desired thickness.
- Rigid Insulation is typically made from polystyrene, polyurethane, or polyisocyanurate foam, which is expanded or formed into large sheets. Rigid insulation can be used to provide a continuous thermal barrier in basements, crawlspaces, and on exterior walls.
Source: ENERGY STAR
