Attic Insulation R Value Chart

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.

Attic insulation r value chart.

Install insulation with the proper r value. How well insulation resists heat flow depends on how and where you install 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. The higher the r value the better the thermal performance of the insulation.

You will need a higher r value of insulation if you live in the northeast than if you live in southern. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. The table below shows what levels of insulation are cost effective for different climates and. Colder climates will typically require a higher r value for even greater thermal.

R value is a measure of insulation s ability to resist heat traveling through it. When calculating the r value of a multilayered installation add the r values of the individual layers. 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. 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. R value refers to the insulation s ability to resist heat flow.

Insulation level are specified by r value. Chart courtesy of energy star. Installing more insulation in your home increases the r value and the resistance to heat flow. Note from this chart that the ideal r value differs for each part of your home.

As a benchmark one inch of solid wood has an r value of 1. The r value depends on the type of insulation density and thickness. The greater the r value the greater the insulating performance. How do you figure out r value.

A high r value then means higher effectiveness. 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. Recommended home insulation r values. R value requirements are different based on your location.