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. Insulation level are specified by r value. 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.

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Typical wall insulation r value.

See the department of energy s doe ranges for recommended levels of insulation below. The r value of air is r 1 while a thick layer of densely packed fiberglass can have an r value of r 25. Recommended home insulation r values. Does not consider internal convection effects.

R value is a measure of insulation s ability to resist heat traveling through it. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. The higher the r value the better the thermal performance of the insulation. 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.

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. The r 0 87 value for the first value in this air r value table subsection. All of us would love to have r 25 values on our rvs but the technology isn t there yet. Most rv manufacturers use a dense polyfoam block foam insulation that ranges between r 5 to r 7 in their rv sidewalls.

The table below shows what levels of insulation are cost effective for different climates and. Does not consider presence absence of reflective barriers.

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