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The department of energy provides a service to determine the exact r value required based on zip code and type of heating fuel.
R value concrete wall basement. You are confusing the minimum thickness of foam on the outside of above ground framing with the code required r value for basement wall insulation using foam. A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other. The code cited by martin is for basement walls. Brian doe s wall foam r value question brian.
The chart you cite is for the above ground framing. Consider adding insulation to the outside of the basement wall this can serve as protection for your waterproofing also. The cool concrete of the foundation wall will collect humid air which will condense on its surface. Foam insulation is preferred over fiberglass as it has a higher r value is resistant to moisture.
By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. 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. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. The r value of an uninsulated 8 inch thick basement wall built using normal weight concrete is 1 35 based on data from the 1993 american society of heating refrigeration and air conditioning engineers handbook.
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