R value comparison

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    David Kaplan

    Yi
    The reasoning is that the continuous insulation gives you the better insulation because it is "continuous." When you put batt insulation in between studs, you only get insulation value in between the studs, but the actual stud itself becomes a thermal break. Thus, every 16" on center, you technically have a cold spot. That's where continuous insulation comes into play. It covers the full exterior wall and is not interrupted (except for at windows, say). So, the higher R-value co continuous insulation gives you a better assembly.

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    Gang Chen (Edited )

    Agree with David. Here is another way to look at this:

    The studs, especially steel studs, will transfer more heat than the insulation, and will compromise the insulation effect.  

    For A, you have a solid R-5 plus a compromised R-10; For B, you have a Solid R-3, plus a compromised R-12. So, A will give a higher overall R rating, and transfer less heat.

    Gang Chen, Author, Architect, LEED AP BD+C (GreenExamEducation.com)

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    Yi Li

    Thanks you David and Gang! 

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