Blown In Insulation Walls R Value

Closed cell spf insulation r value 6 0 to 7 0.

Blown in insulation walls r value.

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. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. 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. R value is a measure of insulation s ability to resist heat traveling through it.

Insulation level are specified by r value. As a benchmark one inch of solid wood has an r value of 1. Open cell spf insulation r value 3 5 to 3 8. Input depth of existing blown in insulation in inches.

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 measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Blown insulation makes it much easier to earn a grade 1 hers. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

The higher the r value the better the thermal performance of the insulation. After a few years blown in insulation tends to settle downward by a few inches which slightly reduces its overall thermal resistance known as r value because it leaves a small section at the. The common denominator among varieties of insulation is the r value. Fiberglass when installed loosely has an r value of 2 5.

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 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. Fiberglass insulation r value 2 8 to 3 7. Inside in the winter and outside in summer.

Recommended home insulation r values. Click the button to calculate the approximate r value for this job. Mineral wool that is blown in also has an r value of 2 5 whereas mineral wool batts have an r value of 3. 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 higher the r value per inch of thickness the better job the insulation will do when you heat or cool your home. Note from this. 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.