Attic Insulation R Value Chart

The r value of some insulations also depends on temperature aging and moisture accumulation.

Attic insulation r value chart.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. 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. When calculating the r value of a multilayered installation add the r values of the individual layers. Install insulation with the proper r value.

The higher the r value the better the thermal performance of the insulation. The r value depends on the type of insulation density and thickness. The amount of insulation recommended for your home will vary depending on a number of factors. For some types of insulation the r value also depends on aging temperature and moisture.

Insulation level are specified by r value. 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. 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. Recommended home insulation r values.

The table below shows what levels of insulation are cost effective for different climates and. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. A high r value then means higher effectiveness. Chart courtesy of energy star.

Colder climates will typically require a higher r value for even greater thermal. How well insulation resists heat flow depends on how and where you install the insulation. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. R value is a measure of insulation s ability to resist heat traveling through it.

The greater the r value the greater the insulating performance. Where you live different climates require different insulation r values. How much insulation should you install. R value refers to the insulation s ability to resist heat flow.

You will need a higher r value of insulation if you live in the northeast than if you live in southern. Note from this chart that the ideal r value differs for each part of your home. How do you figure out r value. Installing more insulation in your home increases the r value and the resistance to heat flow.