Blown In Blanket Insulation R Value

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.

Blown in blanket insulation r value.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. It can also be used for retrofitting existing sidewalls. Input depth of existing blown in insulation in inches. For example fiberglass insulation rated r 23 provides more insulating power than fiberglass insulation rated r 19.

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. The jm spider solution does not settle retaining its original r value and energy efficiency. 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. The higher the r value the more resistance to heat flow.

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. No other product installs better or performs better than optima. 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. 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.

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. You d need a thickness of. As a benchmark one inch of solid wood has an r value of 1. Click the button to calculate the approximate r value for this job.

This price does not include air sealing and ventilation which costs 350 to 1 500. Optima fiberglass insulation is blown behind a special optima fabric or equivalent in new construction. Optima gives homes a custom designed seamless thermally efficient sound reducing blanket that completely fills any void. It offers r values from r 11 to r 70.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.