Blown In Attic Insulation R Value Per Inch

Input length width and desired r value of the area to be insulated.

Blown in attic insulation r value per inch.

Input depth of existing blown in insulation in inches. R value measures how well certain building insulation materials can resist heat. 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.

Fibers from recycled post consumer paper that are treated for insect and fire resistance. The r value per inch for different types of insulation varies depending on the. Click the button to calculate the depth in inches and pounds of total insulation required for this job. Fibers from rock or recycled slag from blast furnaces.

The r value of loose fill cellulose is r 3 2 to 3 8 per inch2. The most common blown in material used but it can rot and grow moldy if exposed to moisture. Here are the r values per inch of the most common types of insulation. The higher the r value the greater the insulation performance.

You can use the small pressurized cans of foam. Click the button to calculate the approximate r value for this job. Know exactly how much you need with our project calculators. This calculator is to be used as an estimating tool only.

Foam in place insulation can be blown into walls on attic surfaces or under floors to insulate and reduce air leakage. 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. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. 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 of insulation by type. As you can see there s some variation in r value depending on the particular type and brand of products used. 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. When determining how much insulation you need don t guesstimate calculate.

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. Achieving the desired r value depends on both the depth of the insulation and its density.