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Depth inches total insulation r value.
Attic insulation r value inches. R value measures how well certain building insulation materials can resist heat. 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. The higher the r value the better the thermal performance of the insulation. 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 total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. Existing 3 4 inches of insulation. Cellulose insulation has a baseline r value of 3 8 per inch.
Dense gray or near white may have black specs. Fiberglass 2 5 x depth. Rock wool 2 8 x depth. Input depth of existing blown in insulation in inches.
All these have r values ranging from r 3 2 to r 3 8 per inch. Small gray flat pieces or fibers from newsprint cellulose 3 7 x depth. R value is a measure of insulation s ability to resist heat flow. This calculator is to be used as an estimating tool only.
When determining how much insulation you need don t guesstimate calculate. The higher the r value the greater the insulation performance. Insulation levels are specified by r value. Click the button to calculate the depth in inches and pounds of total insulation required for this job.
Add insulation to attic. Input length width and desired r value of the area to be insulated. Click the button to calculate the approximate r value for this job. Batts light weight yellow pink or white.
Here are the r values per inch of the most common types of insulation. R value of insulation by type. Recommended insulation levels for retrofitting existing wood framed buildings. Vermiculite or perlite 2 7 x depth.
Light weight yellow pink or white. As you can see there s some variation in r value depending on the particular type and brand of products used.
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