Desired R Value For Attic

Find the recommended r value for attic insulation in your area.

Desired r value for attic.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. The higher the r value the greater the insulation performance. Input length width and desired r value of the area to be insulated. Insulation level are specified by r value.

Of inches to determine your existing r value. R value is a measure of insulation s ability to resist heat traveling through it. Measure the length and width of the attic then multiply those numbers to get the total square footage. 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.

Recommended home insulation r values. Your home s age if your home is more than 10 year old you likely need more insulation. An r value of 40 to 50 rsi seven to 8 8 is recommended for attic insulation in most parts of u s. Be sure to carefully follow the installation instructions to get the desired insulation r value.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. The higher the r value the better the thermal performance of the insulation. An attic with too little insulation will waste energy and money in both winter and summer. Where you live different climates require different insulation r values.

Determining your attic insulation needs. This zone s recommended r value for an uninsulated attic is r30 to r60. If the existing attic floor insulation has an r 11 insulation value then an additional r 27 would be needed to bring the attic floor insulation up to the level recommended for that house. R value measures how well certain building insulation materials can resist heat.

This calculator is to be used as an estimating tool only. This effect is most important if the new insulation is more dense than the old insulation. Calculate the square footage of the attic you re insulating. When determining how much insulation you need don t guesstimate calculate.

It is generally better to insulate to a higher r value than the minimum recommended level. There are many ways to retrofit a home with fiberglass and. The recommended r value for attic floor insulation for this house is r 38. Know exactly how much you need with our project calculators.

Once determined subtract the current r value from your desired r value to get the r value you need to add.