Attic Insulation R Value Inches

Recommended insulation levels for retrofitting existing wood framed buildings.

Attic insulation r value inches.

Here are the r values per inch of the most common types of insulation. The r value for cellulose insulation in an attic depends on several factors including the size shape and construction of your attic typical weather conditions where you live any air leaks and. R value is a measure of insulation s ability to resist heat flow. Fiberglass 2 5 x depth.

Small gray flat pieces or fibers from newsprint cellulose 3 7 x depth. As you can see there s some variation in r value depending on the particular type and brand of products used. The higher the r value the better the thermal performance of the insulation. All these have r values ranging from r 3 2 to r 3 8 per inch.

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. Click the button to calculate the approximate r value for this job. Rock wool 2 8 x depth. Batts light weight yellow pink or white.

Cellulose insulation has a baseline r value of 3 8 per inch. This calculator is to be used as an estimating tool only. Depth inches total insulation r value. Add insulation to attic.

The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. This calculator is to be used as an estimating tool only. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. Input depth of existing blown in insulation in inches.

R value of insulation by type. R value measures how well certain building insulation materials can resist heat. The higher the r value the greater the insulation performance. The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches.

Vermiculite or perlite 2 7 x depth. When determining how much insulation you need don t guesstimate calculate. Dense gray or near white may have black specs. Light weight yellow pink or white.

Existing 3 4 inches of insulation. Click the button to calculate the depth in inches and pounds of total insulation required for this job.