Insulation ratings are measured in R-values per inch of thickness. An R-value tells you how well a type of insulation can keep heat from leaving or entering your home. Insulation R-values vary based on the type, thickness and density of the insulation material. Typically, a higher insulation R rating means better climate control and better energy efficiency for your home. A higher insulation R-value usually means a higher price point as well.
Here are the installation methods from lowest to highest average R-value per inch:
- Blown-in (or loose-fill) insulation
- Insulation blankets (batts and rolls)
- Spray foam insulation
- Foam board insulation
Note that the material the insulation is made from will change the R-value as well.