Attic Insulation R Values Inches

R values of common types of insulation.

Attic insulation r values inches.

Recycled glass or sand that s melted and spun into fibers. Input depth of existing blown in insulation in inches. Your home s age if your home is more than 10 year old you likely need more insulation. Achieving greater r values in exterior walls.

R value is a measure of insulation s ability to resist heat traveling through it. This calculator is to be used as an estimating tool only. Where you live different climates require different insulation r values. You can achieve better thermal performance in your attic by adding an additional layer 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. The table below shows what levels of insulation are cost effective for different climates and. R value is a measure of insulation s ability to resist heat flow. The higher the r value the better the thermal performance of the insulation.

To find the r value of the existing insulation in your attic multiply the number of inches of insulation by the r value for your particular type. Cellulose insulation has a baseline r value of 3 8 per inch. The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

For example a wall with 3 fiberglass batting r value of 10 8. The r value of the insulation for every inch of thickness depends on the type 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. Lighter in weight than cellulose or mineral wool but it settles more than those materials so you ve got to put in a thicker layer to get the protection you need.

For more detailed information on insulation in your part of the country and recommended insulation r value for attics walls and floors. The higher the r value the better the thermal performance of the insulation. The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting. Click the button to calculate the approximate r value for this job.

The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. There are many ways to retrofit a home with fiberglass and. The higher the r value the better the thermal performance of the insulation. Insulation levels are specified by r value.

The recommended r value for attic insulation in ontario is between r 50 and r 60. Add the right kind of insulation.