Attic Floor Insulation R Value

The higher the r value the better the thermal performance of the insulation. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. However it s hard to see a home that has batt insulation that doesn t fall short.

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Insulation level are specified by r value.

Attic floor insulation r value.

The higher the insulation r value the greater the insulating power. R stands for resistance to heat flow. Blown in insulation makes it easy to earn a higher grade rating when it comes to r values. The table below shows what levels of insulation are cost effective for different climates and locations in the home.

You ll see insulation r values indicated on product packaging and often on the product itself. This is because it achieves nominal r value when it fills in the cavities which include the hard to reach in areas voids and gaps. R value is a measure of insulation s ability to resist heat traveling through it. Note from this chart that the ideal r value differs for each part of your home.

Insulation is identified and labeled by r value. Recommended insulation levels for retrofitting existing wood framed buildings.

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