Can You Layer Fiberglass Insulation in Walls?
Generally, fiberglass insulation is 3 ½ inches thick, which make it too dense to layer in conventional walls without compressing the insulation. Compressing the insulation to make it fit is not recommended because the material loses its insulating value. To gain the advantages of fiberglass insulation, you must install the insulation in the proper manner. There are two other combinations you may want to consider if your primary objective is to get a higher R-value for the wall units.
