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.
R21 insulation is approximately 5.5 inches thick. This type of insulation is often used in walls and provides a higher R-value compared to standard insulation options, contributing to improved energy efficiency and thermal comfort in residential and commercial buildings.
Use serrated blades or putty knives to gently remove foam insulation, and for tougher areas, use a power drill or grinder.