Attic Insulation R Values Inches

The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.

Attic insulation r values inches.

Add the right kind of insulation. You can achieve better thermal performance in your attic by adding an additional layer of insulation. R value is a measure of insulation s ability to resist heat flow. 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.

Where you live different climates require different insulation r values. This calculator is to be used as an estimating tool only. 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.

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. Insulation level are specified by r value. For example a wall with 3 fiberglass batting r value of 10 8.

The higher the r value the better the thermal performance of the insulation. The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches. The higher the r value the better the thermal performance of the insulation. Achieving greater r values in exterior walls.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Your home s age if your home is more than 10 year old you likely need more insulation. The table below shows what levels of insulation are cost effective for different climates and. R values of common types of insulation.

The r value of the insulation for every inch of thickness depends on the type of insulation. The recommended r value for attic insulation in ontario is between r 50 and r 60. R value is a measure of insulation s ability to resist heat traveling through it. For more detailed information on insulation in your part of the country and recommended insulation r value for attics walls and floors.

Recycled glass or sand that s melted and spun into fibers. Go to the energy savers insulation page on the u s. Click the button to calculate the approximate r value for this job. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

Insulation levels are specified by r value. Cellulose insulation has a baseline r value of 3 8 per inch.