The thickness of R49 insulation is typically around 14 inches. This measurement ensures that the insulation provides high thermal resistance, commonly used in attics and other areas requiring significant insulation to enhance energy efficiency and comfort.
Blown-in insulation costs range from $750 to $3,800, with an average cost of $1,725 for insulating 750 square feet of attic space.
Attic insulation, especially fiberglass, should be replaced every 15-20 years, particularly if it has been exposed to moisture or mold.