Attic Insulation R Values Inches

Fiberglass 2 5 x depth.

Attic insulation r values inches. Here are the r values per inch of the most common types of insulation. Batts light weight yellow pink or white. As you can see there s some variation in r value depending on the particular type and brand of products used. Closed cell spray foam insulation.

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. Input depth of existing blown in insulation in inches. Vermiculite or perlite 2 7 x depth. 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. Rock wool 2 8 x depth. Click the button to calculate the approximate r value for this job. You can achieve better thermal performance in your attic by adding an additional layer of insulation.

It has a lower r value per inch than closed cell foam and is vapor permeable. Dense gray or near white may have black specs. Depth inches total insulation r value. This calculator is to be used as an estimating tool only.

The higher the r value the better the thermal performance of the insulation. Light weight yellow pink or white. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. R value of insulation by type.