Attic Insulation R Value Chart

R value is a measure of insulation s ability to resist heat traveling through it.

Attic insulation r value chart.

How much insulation should you install. 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 your attic to reach r 30 if you live in zones 2 or 3. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Where you live different climates require different insulation r values.

For some types of insulation the r value also depends on aging temperature and moisture. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. The r value of some insulations also depends on temperature aging and moisture accumulation. As a benchmark one inch of solid wood has an r value of 1.

The table below shows what levels of insulation are cost effective for different climates and. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. The higher the r value the better the thermal performance of the insulation. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. When calculating the r value of a multilayered installation add the r values of the individual layers. You will need a higher r value of insulation if you live in the northeast than if you live in southern. Recommended home insulation r values.

The r value depends on the type of insulation density and thickness. Install insulation with the proper r value. How well insulation resists heat flow depends on how and where you install the insulation. Insulation level are specified by r value.

Chart courtesy of energy star. R value refers to the insulation s ability to resist heat flow. A high r value then means higher effectiveness. Note from this chart that the ideal r value differs for each part of your home.

R value requirements are different based on your location. Colder climates will typically require a higher r value for even greater thermal. The greater the r value the greater the insulating performance. How do you figure out r value.