Blown In Fiberglass Attic Insulation R Values

The higher the r value the better the thermal performance of the insulation.

Blown in fiberglass attic insulation r values.

This calculator is to be used as an estimating tool only. Loose fill insulation can be installed in either enclosed cavities such as walls or unenclosed spaces such as attics. The three most common types of blown in insulation are loose fill fiberglass cellulose and rock wool each with its own pros and cons. 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.

Recommended home insulation r values. The table below shows what levels of insulation are cost effective for different climates and. 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. Insulation level are specified by r value.

One bag of attic protector provides 62 square feet of r 30 coverage. As a benchmark one inch of solid wood has an r value of 1. 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. Johns manville attic protector formaldehyde free premium blow in fiberglass insulation offers effective thermal and acoustical performance.

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. 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. Polystyrene beads vermiculite and perlite are typically poured. Input depth of existing blown in insulation in inches.

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. 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 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. R value is a measure of insulation s ability to resist heat traveling through it.

Minimum suggested insulation values vary by geographic. Fiberglass installation labor cost is about 1 00 to 2 75 per square foot based on the amount of insulation and the location. Click the button to calculate the approximate r value for this job.