Attic Insulation R Values Inches

The recommended r value for attic insulation in ontario is between r 50 and r 60.

Attic insulation r values inches.

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. 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. 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.

The higher the r value the better the thermal performance of the insulation. Recycled glass or sand that s melted and spun into fibers. 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.

R value is a measure of insulation s ability to resist heat flow. Insulation level are specified by r value. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Input depth of existing blown in insulation in inches.

R values of common types of insulation. Your home s age if your home is more than 10 year old you likely need more insulation. The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting. The r value of the insulation for every inch of thickness depends on the type of insulation.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. For more detailed information on insulation in your part of the country and recommended insulation r value for attics walls and floors. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Go to the energy savers insulation page on the u s.

Add the right kind of insulation. Achieving greater r values in exterior walls. This calculator is to be used as an estimating tool only. The higher the r value the better the thermal performance of the insulation.

Where you live different climates require different insulation r values. Recommended home insulation r values. 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. The higher the r value the better the thermal performance of the insulation.

Click the button to calculate the approximate r value for this job. The table below shows what levels of insulation are cost effective for different climates and.