Blown In Fiberglass Attic Insulation R Values

The r values of both insulations will accumulate.

Blown in fiberglass attic insulation r values.

R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. The table below shows what levels of insulation are cost effective for different climates and. Polystyrene beads vermiculite and perlite are typically poured. 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.

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. 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. 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. 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. Johns manville attic protector formaldehyde free premium blow in fiberglass insulation offers effective thermal and acoustical performance. R value is a measure of insulation s ability to resist heat traveling through it. 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.

Minimum suggested insulation values vary by geographic. The three most common types of blown in insulation are loose fill fiberglass cellulose and rock wool each with its own pros and cons. Cellulose fiberglass and rock wool are typically blown in by experienced installers skilled at achieving the correct density and r values. Input depth of existing blown in insulation in inches.

Loose fill insulation can be installed in either enclosed cavities such as walls or unenclosed spaces such as attics. Fiberglass installation labor cost is about 1 00 to 2 75 per square foot based on the amount of insulation and the location. One bag of attic protector provides 62 square feet of r 30 coverage. When you need to add insulation to an attic crawl space or walls of a home the fastest and most cost efficient method is to use blown in insulation.

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. 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. Recommended home insulation r values.