Blown In Insulation Walls 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.

Blown in insulation walls r value.

Note from this. The higher the r value the better the thermal performance of the 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. This is especially true for builders working under the 2015 energy code which requires that homes be evaluated according to resnet s home energy rating system hers.

Fiberglass when installed loosely has an r value of 2 5. 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. Click the button to calculate the approximate r value for this job. 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.

The vast majority of production builders use batt insulation in the walls of the homes they construct but there s a strong case to be made for blown fiberglass. Closed cell spf insulation r value 6 0 to 7 0. Fiberglass insulation r value 2 8 to 3 7. 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.

Mineral wool that is blown in also has an r value of 2 5 whereas mineral wool batts have an r value of 3. Input depth of existing blown in insulation in inches. The table below shows what levels of insulation are cost effective for different climates and. As a benchmark one inch of solid wood has an r value of 1.

R value is a measure of insulation s ability to resist heat traveling through it. Perhaps it is obvious but the higher the r value the more resistance the material has to the transfer of heat that is keeping heat where you want it. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. The common denominator among varieties of insulation is the r value.

Recommended home insulation r values. This calculator is to be used as an estimating tool only. Blown insulation makes it much easier to earn a grade 1 hers. Open cell spf insulation r value 3 5 to 3 8.

R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. When installed as solid panels its r value can vary from 2 5 to 3 6 depending on the particular style.