Insulation level are specified by r value.
Blown in fiberglass attic insulation r values.
The r values of both insulations will accumulate.
Recommended home insulation r values.
Cellulose fiberglass and rock wool are typically blown in by experienced installers skilled at achieving the correct density and r values.
Loose fill insulation can be installed in either enclosed cavities such as walls or unenclosed spaces such as attics.
As a benchmark one inch of solid wood has an r value of 1.
This calculator is to be used as an estimating tool only.
The three most common types of blown in insulation are loose fill fiberglass cellulose and rock wool each with its own pros and cons.
Click the button to calculate the approximate r value for this job.
Johns manville attic protector formaldehyde free premium blow in fiberglass insulation offers effective thermal and acoustical performance.
R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.
Spray foam insulation for both types starts at about 1 50 per square foot and can cost more than 5 00 per square foot when a thick application is applied.
The table below shows what levels of insulation are cost effective for different climates and.
Installed with a portable blowing machine it s perfect for covering hard to reach areas within attics and provides a more efficient installation for homeowners or remodeling.
For example if your attic already has fiberglass insulation blankets installed you can improve its r value by installing blown in cellulose insulation on top of the blankets.
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.
Minimum suggested insulation values vary by geographic.
The higher the r value the better the thermal performance of the insulation.
Input depth of existing blown in insulation in inches.
R value is a measure of insulation s ability to resist heat traveling through it.
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 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.
Polystyrene beads vermiculite and perlite are typically poured.
One bag of attic protector provides 62 square feet of r 30 coverage.