Desired R Value For Attic

This zone s recommended r value for an uninsulated attic is r30 to r60.

Desired r value for attic.

How to calculate existing r value in an attic. Insulation level are specified by r value. The next step is to visit with an insulation specialist to determine the kind and amount of insulation that will be needed to bring your attic space up to the desired r value. Instructions on the product where current r value is listed will guide you through estimating the number of packages to buy based on the number of square feet you re insulating and the desired r value.

R values help homeowners decide which type of insulation material to use and in what thickness. R value is a measure of insulation s ability to resist heat traveling through it. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

An r value is a measure of a given material s. Measure the length and width of the attic then multiply those numbers to get the total square footage. Add your depth or thickness measurements and multiply by the estimated r value shown in the right column. Your home s age if your home is more than 10 year old you likely need more insulation.

Of inches to determine your existing r value. Be sure to carefully follow the installation instructions to get the desired insulation r value. Once determined subtract the current r value from your desired r value to get the r value you need to add. Subtract that amount from the desired r value for your home s zone to.

Calculate the square footage of the attic you re insulating. You may choose to do it yourself or hire a contractor. Per bag 18 4 bags an additional 19 bags of insulation would therefore achieve an r value of 60. Recommended home insulation r values.

If the 1000 square foot attic previously had 9 inches r 24 of insulation and an r value of 60 is desired an additional 13 25 inches r36 of insulation would be required. This effect is most important if the new insulation is more dense than the old insulation. Where you live different climates require different insulation r values. Determining your attic insulation needs.

The higher the r value the better the thermal performance of the insulation.