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