Attic Insulation R Values Inches

R value of insulation by type.

Attic insulation r values inches.

This calculator is to be used as an estimating tool only. Light weight yellow pink or white. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. Achieving greater r values in exterior walls.

R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. Small gray flat pieces or fibers from newsprint cellulose 3 7 x depth. Dense gray or near white may have black specs.

Click the button to calculate the approximate r value for this job. Closed cell spray foam insulation. The higher the r value the better the thermal performance of the insulation. Batts light weight yellow pink or white.

Depth inches total insulation r value. As you can see there s some variation in r value depending on the particular type and brand of products used. Input depth of existing blown in insulation in inches. Here are the r values per inch of the most common types of insulation.

As a benchmark one inch of solid wood has an r value of 1. Rock wool 2 8 x depth. It has a lower r value per inch than closed cell foam and is vapor permeable. Fiberglass 2 5 x depth.