 | To insulate a wall assembly to R-23 is an easier task with new wall units. Existing walls present more of a challenge and will require a combination of approaches in order to get an R-23 insulation value. The United States Department of Energy recommends an R-value of R-11 to R-38 on the exterior wall assemblies of additions and new homes. A 2 x 4 cavity is 3 ス inches deep. In contrast, a 2 x 6 cavity has 5 ス inches of depth. You can put 3 ス inches of insulation in a 2 x 4 wall and 5 ス inches of insulation in a 2 x 6 wall. Fiberglass batt, cellulose and wool are the most common type of products used in the interior wall cavities. The R-value of the products vary. The R-value measures the capacity of the insulation to prevent heat loss. R-value is usually displayed as the R-value per inch of material.
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