Attic Insulation R Value Chart

How much insulation should you install.

Attic insulation r value chart.

For some types of insulation the r value also depends on aging temperature and moisture. 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. The greater the r value the greater the insulating performance. 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.

When calculating the r value of a multilayered installation add the r values of the individual layers. How well insulation resists heat flow depends on how and where you install the insulation. The r value depends on the type of insulation density and thickness. 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.

The table below shows what levels of insulation are cost effective for different climates and. 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. The r value of some insulations also depends on temperature aging and moisture accumulation. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

Install insulation with the proper r value. 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. Note from this chart that the ideal r value differs for each part of your home. Where you live different climates require different insulation r values.

Chart courtesy of energy star. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. A high r value then means higher effectiveness. 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 higher the r value the better the thermal performance of the insulation. R value requirements are different based on your location. How do you figure out r value.

R value is a measure of insulation s ability to resist heat traveling through it. Colder climates will typically require a higher r value for even greater thermal. Insulation level are specified by r value. The amount of insulation recommended for your home will vary depending on a number of factors.