Attic Insulation R Value Inches

Click the button to calculate the approximate r value for this job.

Attic insulation r value inches.

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

R value of insulation by type. Add insulation to attic. This calculator is to be used as an estimating tool only. Input depth of existing blown in insulation in inches.

Fiberglass 2 5 x depth. This calculator is to be used as an estimating tool only. Batts light weight yellow pink or white. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.

Vermiculite or perlite 2 7 x depth. Light weight yellow pink or white. Recommended insulation levels for retrofitting existing wood framed buildings. All these have r values ranging from r 3 2 to r 3 8 per inch.

The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches. Insulation levels are specified by r value. Here are the r values per inch of the most common types of insulation. The higher the r value the greater the insulation performance.

Depth inches total insulation r value. R value is a measure of insulation s ability to resist heat flow. Existing 3 4 inches of insulation. Cellulose insulation has a baseline r value of 3 8 per inch.

As you can see there s some variation in r value depending on the particular type and brand of products used. Know exactly how much you need with our project calculators. 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. R value measures how well certain building insulation materials can resist heat.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.