Blown Attic Insulation R Value Per Inch

Foam in place insulation can be blown into walls on attic surfaces or under floors to insulate and reduce air leakage.

Blown attic insulation r value per inch.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Click the button to calculate the approximate r value for this job. The r value of insulation is a measure of how well it reduces the flow of heat and cold into and out of your house.

How much is enough. 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. Input depth of existing blown in insulation in inches. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3.

The higher the r value per inch of thickness the better job the insulation will do when you heat or cool your home. 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. Cellulose insulation has a baseline r value of 3 8 per inch.

As a benchmark one inch of solid wood has an r value of 1. 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.