Attic Insulation R Values Inches

The higher the r value the better the thermal performance of the insulation.

Attic insulation r values inches.

R value of insulation by type. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. As a benchmark one inch of solid wood has an r value of 1. Light weight yellow pink or white.

Vermiculite or perlite 2 7 x depth. As you can see there s some variation in r value depending on the particular type and brand of products used. Rock wool 2 8 x depth. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

Closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. Click the button to calculate the approximate r value for this job. Closed cell spray foam insulation. Small gray flat pieces or fibers from newsprint cellulose 3 7 x depth.

Depth inches total insulation r value. 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. Here are the r values per inch of the most common types of insulation.

You can achieve better thermal performance in your attic by adding an additional layer of insulation. Input depth of existing blown in insulation in inches. Batts light weight yellow pink or white. Dense gray or near white may have black specs.