Attic Insulation R Values Inches

You can achieve better thermal performance in your attic by adding an additional layer of insulation.

Attic insulation r values inches.

Insulation level are specified by r value. The r value of the insulation for every inch of thickness depends on the type of insulation. R value is a measure of insulation s ability to resist heat traveling through it. Cellulose insulation has a baseline r value of 3 8 per inch.

The higher the r value the better the thermal performance of the insulation. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. The higher the r value the better the thermal performance of the insulation. The table below shows what levels of insulation are cost effective for different climates and.

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. 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 recommended r value for attic insulation in ontario is between r 50 and r 60. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

R values of common types of insulation. Click the button to calculate the approximate r value for this job. The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches. For more detailed information on insulation in your part of the country and recommended insulation r value for attics walls and floors.

There are many ways to retrofit a home with fiberglass and. 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. Recycled glass or sand that s melted and spun into fibers. Input depth of existing blown in insulation in inches.

The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting. Where you live different climates require different insulation r values. Your home s age if your home is more than 10 year old you likely need more insulation. This calculator is to be used as an estimating tool only.

Insulation levels are specified by r value. The higher the r value the better the thermal performance of the insulation. Add the right kind of insulation. Go to the energy savers insulation page on the u s.

Achieving greater r values in exterior walls. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.