Blown In Attic Insulation R Value Per Inch

While there are additional considerations such as venting and moisture problems to take into account when you insulate under floors the united states department of energy recommends an r 25 rating in cold climates and an r 11 in warmer parts of the country.

Blown in attic insulation r value per inch.

The r value per inch for different types of insulation varies depending on the. This calculator is to be used as an estimating tool only. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. When determining how much insulation you need don t guesstimate calculate.

Some installations can yield a higher r value than traditional batt insulation for the same thickness and can fill even the smallest cavities creating an effective air barrier. The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. Here are the r values per inch of the most common types of insulation. Click the button to calculate the approximate r value for this job.

Foam in place insulation can be blown into walls on attic surfaces or under floors to insulate and reduce air leakage. Input length width and desired r value of the area to be insulated. As you can see there s some variation in r value depending on the particular type and brand of products used. Fibers from recycled post consumer paper that are treated for insect and fire resistance.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. R value measures how well certain building insulation materials can resist heat. The most common blown in material used but it can rot and grow moldy if exposed to moisture. Input depth of existing blown in insulation in inches.

Achieving the desired r value depends on both the depth of the insulation and its density. This calculator is to be used as an estimating tool only. Insulation depth depending on your climate energy codes require varying r values for ceiling insulation. The higher the r value the greater the insulation performance.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. As a benchmark one inch of solid wood has an r value of 1. R value of insulation by type.

When you need to add insulation to an attic crawl space or walls of a home the fastest and most cost efficient method is to use blown in insulation. The average cost of blown in insulation to achieve an r value of r 38 r 49 is 1 665 with most homeowners spending between 874 and 2 156 or 1 59 per square foot.