Blown Attic Insulation R Value Per Inch

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.

Blown attic insulation r value per inch.

How much is enough. Cellulose insulation has a baseline r value of 3 8 per inch. 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 depth of existing blown in insulation in inches. The r value per inch for different types of insulation varies depending on the. 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. 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.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. 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. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. You can use the small pressurized cans of foam.

As a benchmark one inch of solid wood has an r value of 1. By today s standards most homes built more than 10 years ago can be considered under insulated.