Typical Wall Insulation R Value

The r value of air is r 1 while a thick layer of densely packed fiberglass can have an r value of r 25.

Typical wall insulation r value.

Recommended home insulation r values. Most rv manufacturers use a dense polyfoam block foam insulation that ranges between r 5 to r 7 in their rv sidewalls. These r values are a sum meaning this should be the total r value once you add up the entire depth of 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.

Air gap or air film 3 4 air space insulating properties. All of us would love to have r 25 values on our rvs but the technology isn t there yet. 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. The higher the r value the better the thermal performance of the insulation.

Does not consider presence absence of reflective barriers. See the department of energy s doe ranges for recommended levels of insulation below. 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. Insulation level are specified by r value.

The r 0 87 value for the first value in this air r value table subsection. 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.