Desired R Value For Attic

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.

Desired r value for attic. Know exactly how much you need with our project calculators. Be sure to carefully follow the installation instructions to get the desired insulation r value. There are many ways to retrofit a home with fiberglass and. Calculate the square footage of the attic you re insulating.

The homeowner could then check table 1 to find several choices. Your home s age if your home is more than 10 year old you likely need more insulation. This calculator is to be used as an estimating tool only. Subtract that amount from the desired r value for your home s zone to.

When determining how much insulation you need don t guesstimate calculate. Once determined subtract the current r value from your desired r value to get the r value you need to add. The recommended r value for attic floor insulation for this house is r 38. This zone s recommended r value for an uninsulated attic is r30 to r60.

This effect is most important if the new insulation is more dense than the old insulation. Of inches to determine your existing r value. 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. 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. Find the recommended r value for attic insulation in your area. Where you live different climates require different insulation r values. Recommended home insulation r values.

Insulation level are specified by r value. Determining your attic insulation needs. It is generally better to insulate to a higher r value than the minimum recommended level. R value is a measure of insulation s ability to resist heat traveling through it.

You can compensate for this stacking effect and achieve the desired total r value by adding about one extra inch of insulation if the old insulation is fiber glass or about 1 2 inch if the old insulation is rock wool or cellulose. The higher the r value the better the thermal performance of the insulation. Input length width and desired r value of the area to be insulated. R value measures how well certain building insulation materials can resist heat.

An attic with too little insulation will waste energy and money in both winter and summer.