Blown In Insulation R Value

Click the button to calculate the depth in inches and pounds of total insulation required for this job.

Blown in insulation r value.

The higher the r value the better the thermal performance of the insulation. When installed as solid panels its r value can vary from 2 5 to 3 6 depending on the particular style. Achieving the desired r value depends on both the depth of the insulation and its density. 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.

The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. Input depth of existing blown in insulation in inches. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. The table below shows what levels of insulation are cost effective for different climates and locations in the home.

This calculator is to be used as an estimating tool only. The common denominator among varieties of insulation is the r value. Input length width and desired r value of the area to be insulated. Insulation level are specified by r value.

This calculator is to be used as an estimating tool only. Click the button to calculate the approximate r value for this job. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. R value is a measure of insulation s ability to resist heat traveling through it.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. A bag of cellulose runs about 11 50 and will cover 36 7 square feet at a. Insulation depth depending on your climate energy codes require varying r values for ceiling insulation. The r value of insulation is a measure of how well it reduces the flow of heat and cold into and out of your house.

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 higher the r value per inch of thickness the better job the insulation will do when you heat or cool your home. As a benchmark one inch of solid wood has an r value of 1. 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.

Fiberglass when installed loosely has an r value of 2 5.