Attic Insulation R Value Inches

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Attic insulation r value inches.

The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. R value measures how well certain building insulation materials can resist heat. Recommended insulation levels for retrofitting existing wood framed buildings. Input depth of existing blown in insulation in inches.

R value is a measure of insulation s ability to resist heat flow. Here are the r values per inch of the most common types of insulation. 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.

The higher the r value the better the thermal performance of the insulation. Dense gray or near white may have black specs. Input length width and desired r value of the area to be insulated. When determining how much insulation you need don t guesstimate calculate.

The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. Light weight yellow pink or white. Insulation levels are specified by r value. Fiberglass 2 5 x depth.

The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches. The higher the r value the greater the insulation performance. All these have r values ranging from r 3 2 to r 3 8 per inch. Add insulation to attic.

Know exactly how much you need with our project calculators. Existing 3 4 inches of insulation. Rock wool 2 8 x depth. Cellulose insulation has a baseline r value of 3 8 per inch.

R value of insulation by type. 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. Vermiculite or perlite 2 7 x depth. Batts light weight yellow pink or white.

Depth inches total insulation r value. This calculator is to be used as an estimating tool only.