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Input depth of existing blown in insulation in inches.
Blown in insulation r value. Fiberglass when installed loosely has an r value of 2 5. Achieving the desired r value depends on both the depth of the insulation and its density. These r values are a sum meaning this should be the total r value once you add up the entire depth of 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.
Insulation level are specified by 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. When installed as solid panels its r value can vary from 2 5 to 3 6 depending on the particular style. A bag of cellulose runs about 11 50 and will cover 36 7 square feet at a.
R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. As a benchmark one inch of solid wood has an r value of 1. 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. This calculator is to be used as an estimating tool only.
Click the button to calculate the approximate r value for this job. This calculator is to be used as an estimating tool only. Insulation depth depending on your climate energy codes require varying r values for ceiling insulation. 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.
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. The common denominator among varieties of insulation is the r value. The table below shows what levels of insulation are cost effective for different climates and locations in the home.
The higher the r value the better the thermal performance of the insulation. Mineral wool that is blown in also has an r value of 2 5 whereas mineral wool batts have an r value of 3. 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.
Input length width and desired r value of the area to be insulated.
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