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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.
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. 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. Recommended home insulation r values.
Insulation level are specified by r value. The r 0 87 value for the first value in this air r value table subsection. 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.
The r value of air is r 1 while a thick layer of densely packed fiberglass can have an r value of r 25. See the department of energy s doe ranges for recommended levels of insulation below. R value is a measure of insulation s ability to resist heat traveling through it. Air gap or air film 3 4 air space insulating properties.
Does not consider presence absence of reflective barriers. 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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