Attic Insulation Depth R Value

Cellulose insulation has a baseline r value of 3 8 per inch.

Attic insulation depth r value.

Dense gray or near white may have black specs. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. Insulation levels are specified by r value. Add the right kind of insulation.

Foam in place insulation can be blown into walls on attic surfaces or under floors to insulate and reduce air leakage. As a benchmark one inch of solid wood has an r value of 1. Some installations can yield a higher r value than traditional batt insulation for the same thickness and can fill even the smallest cavities creating an effective air barrier. The higher the r value the better the thermal performance of the insulation.

The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches. Fiberglass 2 5 x depth. You can use the small pressurized cans of foam. Insulation level are specified by r value.

R value is a measure of insulation s ability to resist heat flow. 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. Achieving greater r values in exterior walls. R value is a measure of insulation s ability to resist heat traveling through it.

Light weight yellow pink or white. What it probably is depth inches total insulation r value. Recommended home insulation r values. 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. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. You can achieve better thermal performance in your attic by adding an additional layer of insulation.