Attic Insulation R Value Chart

A high r value then means higher effectiveness.

Attic insulation r value chart.

R value is a measure of insulation s ability to resist heat traveling through it. For some types of insulation the r value also depends on aging temperature and moisture. Install insulation with the proper r value. Recommended home insulation r values.

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. Insulation level are specified by r value. Note from this chart that the ideal r value differs for each part of your home. The greater the r value the greater the insulating performance.

R value requirements are different based on your location. The r value depends on the type of insulation density and thickness. 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. Where you live different climates require different insulation r values.

Achieving greater r values in attics the higher the r value the better the thermal performance of 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. 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.

Chart courtesy of energy star. How much insulation should you install. The amount of insulation recommended for your home will vary depending on a number of factors. Colder climates will typically require a higher r value for even greater thermal.

Installing more insulation in your home increases the r value and the resistance to heat flow. R value refers to the insulation s ability to resist heat flow. 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.

The r value of some insulations also depends on temperature aging and moisture accumulation. How well insulation resists heat flow depends on how and where you install the insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern. 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.