Typical Wall Insulation R Value

Since the wood framing members have a thermal resistance r value roughly equal to only one quarter the r value of typical insulation products the overall r value of the wall is calculated at. R value is a measure of insulation s ability to resist heat traveling through it. The r value of air is r 1 while a thick layer of densely packed fiberglass can have an r value of r 25.

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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 in your attic to reach r 30 if you live in zones 2 or 3.

Typical wall insulation r value.

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. Air gap or air film 3 4 air space insulating properties. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Does not consider internal convection effects.

Does not consider presence absence of reflective barriers. The table below shows what levels of insulation are cost effective for different climates and. See the department of energy s doe ranges for recommended levels of insulation below. All of us would love to have r 25 values on our rvs but the technology isn t there yet.

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. Most rv manufacturers use a dense polyfoam block foam insulation that ranges between r 5 to r 7 in their rv sidewalls. The higher the r value the better the thermal performance of the insulation. Recommended home insulation r values.

The r 0 87 value for the first value in this air r value table subsection. Insulation level are specified by r value.

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