The R-value of open cell spray foam is 3.5 per inch. Therefore, it takes around 14.5 inches of this insulation to reach the R49 level of thermal resistance.Nov 20, 2021
How much does R49 insulation cost?
Blown-In Insulation Cost The average cost of blown-in insulation to achieve an R-value of R-38–R-49 is $1,665 with most homeowners spending between $874 and $2,156 or $1.59 per square foot. This price does not include air sealing and ventilation which costs $350 to $1,500.
What is R49 insulation used for?
The Owens Corning Paperfaced R49 is a flexible fiberglass insulation proposed to control moisture in concealed applications in between the studs and joists. With a paper facing on one side of the insulation, the R-49 Paperface Batt Insulation is smooth and flexible and can be easily cut for installation.
How many inches of blown insulation do I need for R49?
When blown into attics and wall spaces, loose-fill fiberglass offers an average R-2.5 thermal value per inch (the higher the number, the greater the insulating effect). You'd need a thickness of about 7.5 inches of insulation to match the insulating value of a batt of R-19 insulation (R-19 is a common batt value).Oct 5, 2020