Attic Insulation R Value Chart

Colder climates will typically require a higher r value for even greater thermal.

Attic insulation r value chart.

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. R value requirements are different based on your location. 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. Installing more insulation in your home increases the r value and the resistance to heat flow.

Chart courtesy of energy star. Note from this chart that the ideal r value differs for each part of your home. Recommended home insulation r values. Insulation level are specified by r value.

The greater the r value the greater the insulating performance. 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. Where you live different climates require different insulation r values.

How much insulation should you install. The table below shows what levels of insulation are cost effective for different climates and. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. R value refers to the insulation s ability to resist heat flow.

The r value of some insulations also depends on temperature aging and moisture accumulation. R value is a measure of insulation s ability to resist heat traveling through it. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. A high r value then means higher effectiveness.

Install insulation with the proper 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. The r value depends on the type of insulation density and thickness. As a benchmark one inch of solid wood has an r value of 1.

How well insulation resists heat flow depends on how and where you install 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. How do you figure out r value. When calculating the r value of a multilayered installation add the r values of the individual layers.