Attic Insulation R Values Inches

Add the right kind of insulation.

Attic insulation r values inches.

The r value of the insulation for every inch of thickness depends on the type of insulation. There are many ways to retrofit a home with fiberglass and. The higher the r value the better the thermal performance of the insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

Go to the energy savers insulation page on the u s. For more detailed information on insulation in your part of the country and recommended insulation r value for attics walls and floors. Recommended home insulation r values. Where you live different climates require different insulation r values.

Click the button to calculate the approximate r value for this job. 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 two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

This calculator is to be used as an estimating tool only. The table below shows what levels of insulation are cost effective for different climates and. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. R value is a measure of insulation s ability to resist heat flow.

Achieving greater r values in exterior walls. Cellulose insulation has a baseline r value of 3 8 per inch. Insulation level are specified by r value. The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches.

The recommended r value for attic insulation in ontario is between r 50 and r 60. The higher the r value the better the thermal performance of the insulation. 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. Input depth of existing blown in insulation in inches.

Insulation levels are specified by r value. For example a wall with 3 fiberglass batting r value of 10 8. Your home s age if your home is more than 10 year old you likely need more 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.

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