Blown In Insulation R Value

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.

Blown in insulation r value.

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. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. Mineral wool that is blown in also has an r value of 2 5 whereas mineral wool batts have an r value of 3.

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. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. R value is a measure of insulation s ability to resist heat traveling through it. 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.

When installed as solid panels its r value can vary from 2 5 to 3 6 depending on the particular style. The table below shows what levels of insulation are cost effective for different climates and locations in the home. Click the button to calculate the approximate r value for this job. The higher the r value the better the thermal performance of the insulation.

Fiberglass when installed loosely has an r value of 2 5. Input depth of existing blown in insulation in inches. Achieving the desired r value depends on both the depth of the insulation and its density. Insulation depth depending on your climate energy codes require varying r values for ceiling insulation.

A bag of cellulose runs about 11 50 and will cover 36 7 square feet at a. The common denominator among varieties of insulation is the r value. The higher the r value per inch of thickness the better job the insulation will do when you heat or cool your home. Input length width and desired r value of the area to be insulated.

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. This calculator is to be used as an estimating tool only. 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.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.