Attic Insulation R Values Inches

It has a lower r value per inch than closed cell foam and is vapor permeable.

Attic insulation r values inches.

Small gray flat pieces or fibers from newsprint cellulose 3 7 x depth. You can achieve better thermal performance in your attic by adding an additional layer of insulation. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Vermiculite or perlite 2 7 x depth.

Fiberglass 2 5 x depth. 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. Depth inches total insulation r value. Dense gray or near white may have black specs.

The higher the r value the better the thermal performance of the insulation. Batts light weight yellow pink or white. Achieving greater r values in exterior walls. Closed cell spray foam insulation.

This calculator is to be used as an estimating tool only. R value of insulation by type. Click the button to calculate the approximate r value for this job. Rock wool 2 8 x depth.

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. Light weight yellow pink or white. 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.