Attic Insulation R Values Inches
Fiberglass 2 5 x depth.
Attic insulation r values inches. You can achieve better thermal performance in your attic by adding an additional layer of insulation. As you can see there s some variation in r value depending on the particular type and brand of products used. Here are the r values per inch of the most common types of insulation. The higher the r value the better the thermal performance of the insulation.
Input depth of existing blown in insulation in inches. 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. It has a lower r value per inch than closed cell foam and is vapor permeable.
Light weight yellow pink or white. Rock wool 2 8 x depth. Batts light weight yellow pink or white. This calculator is to be used as an estimating tool only.
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. Click the button to calculate the approximate r value for this job. Dense gray or near white may have black specs. Closed cell spray foam insulation.
Achieving greater r values in exterior walls. Small gray flat pieces or fibers from newsprint cellulose 3 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. As a benchmark one inch of solid wood has an r value of 1.
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