R Value Averages

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    Michael Lawson

    I think you would be given the R values and Dimensions as you would think, then you could take the weighted average to find the overall U value. This is off the top of my head, so I could be wrong. You could say this wall is 100SF, with areas 1=25SF, 2=70SF and 3=5SF, then plug each R value in as percentages of the whole to find the weighted R-Value. Then "1/Weighted R-Value" should give you the U value of the wall in total. 

    Hopefully someone can chime in and let me know if I'm off base. I just googled this and found worksheets like this. 

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    Benjamin Marcionek (Edited )

    Assuming you are given the areas/dimensions and U-Values; use the equation given in the references.

    (U-w x A-w) + (U-op x A-op) / A-total wall

    w=window

    op=wall

    And if you need the R-Value remember that R = 1 / U Value.

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