Attic Insulation Depth R Value

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. The higher the r value the better the thermal performance of the insulation.

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R value is a measure of insulation s ability to resist heat traveling through it.

Attic insulation depth r value.

Insulation level are specified by r value. 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. Dense gray or near white may have black specs. The higher the r value the better the thermal performance of the insulation.

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. Fiberglass 2 5 x depth. You can achieve better thermal performance in your attic by adding an additional layer of insulation. What it probably is depth inches total insulation r value.

Cellulose insulation has a baseline r value of 3 8 per inch. The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches. Recommended home insulation r values. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. 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. The higher the r value the better the thermal performance of the insulation.

The table below shows what levels of insulation are cost effective for different climates and. R value is a measure of insulation s ability to resist heat flow. Add the right kind of insulation. Insulation levels are specified by r value.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Light weight yellow pink or white. You can use the small pressurized cans of foam.