Blown In Blanket Insulation R Value

In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7.

Blown in blanket insulation r value.

Optima fiberglass insulation is blown behind a special optima fabric or equivalent in new construction. 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. The specially designed atticat machine conditions the insulation by adding millions of tiny air pockets that give the material its insulating power and energy saving r value over time. You d need a thickness of.

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 calculator is to be used as an estimating tool only. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Click the button to calculate the approximate r value for this job. In short an insulation s r value depends on the type of insulation its thickness and its density. Johns manville s spider loose fill insulation is blown in behind the bibs fabric for complete coverage making it easier to install at r 15 and r 23 in 2 4 and 2 6 walls without bulging.

No other product installs better or performs better than optima. Input depth of existing blown in insulation in inches. Blowing the insulation should take less than 1 5 hours and the whole job can be completed in less than 4 hours based on a 1 000 sq. Once installed bibs offers the highest attainable r values available by cost 4 2 per square inch meaning the buildings in which it s used will offer maximum thermal efficiency which is good for the environment and the occupant s wallet.

For example fiberglass insulation rated r 23 provides more insulating power than fiberglass insulation rated r 19. It offers r values from r 11 to r 70. It can also be used for retrofitting existing sidewalls. As a benchmark one inch of solid wood has an r value of 1.

The higher the r value the more resistance to heat flow.