Cellulose Attic Insulation R Value

There are many ways to retrofit a home with fiberglass and.

Cellulose attic insulation r value.

Polystyrene loose fill or bead insulation typically has a lower r value compared to the foam board. Click the button to calculate the approximate r value for this job. Your home s age if your home is more than 10 year old you likely need more insulation. Most of your home s heat is lost through conduction where blown in cellulose insulation r value read more.

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. The thermal resistance or r value of polystyrene foam board depends on its density. Where you live different climates require different insulation r values. Loose fill cellulose insulation can settle around and conform to most of the obstructions found in walls and attics.

When walls are already finished injecting loose fill cellulose insulation is one of the few ways of adding. Input length width and desired r value of the area to be insulated. With blown in cellulose insulation that would require insulation to a depth of 10 inches. So for example a home in kansas is recommended to have a minimum r38 for attic 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. Loose fill cellulose is relatively inexpensive yet still has an r value of about 3 5 per inch of thickness compared to fiberglass r value between r3 to r4 per inch. Once the current r value is estimated check the recommended r value based on the region of the country. It measures the ability of a material to impede the flow of heat along a continuous solid mass.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. As a benchmark one inch of solid wood has an r value of 1. This calculator is to be used as an estimating tool only. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

The term used to define an insulation material s resistance to heat loss. Click the button to calculate the depth in inches and pounds of total insulation required for this job. Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. R value is an essential factor to consider when selecting an insulation material for your premises.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california.