Attic Insulation R Value Chart

You will need a higher r value of insulation if you live in the northeast than if you live in southern.

Attic insulation r value chart.

The r value depends on the type of insulation density and thickness. Install insulation with the proper r value. Note from this chart that the ideal r value differs for each part of your home. 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. A high r value then means higher effectiveness. R value is a measure of insulation s ability to resist heat traveling through it. R value requirements are different based on your location.

The r value of some insulations also depends on temperature aging and moisture accumulation. How do you figure out r value. Chart courtesy of energy star. The higher the r value the better the thermal performance of the insulation.

As a benchmark one inch of solid wood has an r value of 1. 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. Where you live different climates require different insulation r values. The table below shows what levels of insulation are cost effective for different climates and.

R value refers to the insulation s ability to resist heat flow. Recommended home insulation r values. Colder climates will typically require a higher r value for even greater thermal. 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.

The greater the r value the greater the insulating performance. Installing more insulation in your home increases the r value and the resistance to 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. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

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. 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. Insulation level are specified by r value.