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Cellulose insulation has an average thermal value of r 3 7 so you d need just over five inches to equal an r 19 batt.
Blown in cellulose insulation r value. R value measures conductive resistance. R stands for resistance and the higher an insulation s r value the more efficiently it resists transfer of heat from a warm zone into a cooler zone. Achieving the desired r value depends on both the depth of the insulation and its density. The choices can be difficult to sift but cellulose insulation passes as a strong contender.
The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. For every type and material of insulation check the r value per inch of thickness that the manufacturer has listed. The common standard by which insulation is measured r value is the level of resistance to heat flow. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3.
A bag of cellulose runs about 11 50 and will cover 36 7 square feet at a. Insulation is rated by its r value. 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.
A higher insulation r value usually means a higher price point as well. 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. On average blown in cellulose insulation is 2 3 inches thinner than fiberglass insulation when both have the same r values. Insulation depth depending on your climate energy codes require varying r values for ceiling insulation.
Typically a higher insulation r rating means better climate control and better energy efficiency for your home. Insulation materials come in many forms. Input depth of existing blown in insulation in inches. This calculator is to be used as an estimating tool only.
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. The r values between blown in cellulose insulation and fiberglass insulation are the same but the thickness varies. Loose fill cellulose is relatively inexpensive yet still has an r value of about 3 5 per inch of thickness compared to fiberglass r value between r3 to r4 per inch. Both blown in cellulose insulation and fiberglass insulation perform well to insulate your home.
Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. They are sprayed stapled blown nailed or simply laid in place.
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