Attic Insulation R Value Chart

R value refers to the insulation s ability to resist heat flow.

Attic insulation r value chart.

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. 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 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 do you figure out r value. The higher the r value the better the thermal performance of the insulation. A high r value then means higher effectiveness.

How well insulation resists heat flow depends on how and where you install the insulation. 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. Note from this chart that the ideal r value differs for each part of your home.

R value requirements are different based on your location. Install insulation with the proper r value. The amount of insulation recommended for your home will vary depending on a number of factors. 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. The r value of some insulations also depends on temperature aging and moisture accumulation. 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.

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

R value is a measure of insulation s ability to resist heat traveling through it. 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. How much insulation should you install.