Blown In Insulation Walls R Value

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

Blown in insulation walls r value.

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. Open cell spf insulation r value 3 5 to 3 8. When installed as solid panels its r value can vary from 2 5 to 3 6 depending on the particular style. Inside in the winter and outside in summer.

Input depth of existing blown in insulation in inches. As a benchmark one inch of solid wood has an r value of 1. 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. The common denominator among varieties of insulation is the r value.

In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. 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. Fiberglass when installed loosely has an r value of 2 5. 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.

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. Recommended home insulation r values. The higher the r value the better the thermal performance of the insulation. Closed cell spf insulation r value 6 0 to 7 0.

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 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.

Fiberglass insulation r value 2 8 to 3 7. 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 table below shows what levels of insulation are cost effective for different climates and. 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.

Blown insulation makes it much easier to earn a grade 1 hers. 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. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.