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R values – examples of commercial applications

rcr113 | Posted in Building Code Questions on

I am trying to narrow down a list of commercial applications that require the following R-values:


The applications are more for partitioning large areas (loading docks from warehouse, freezers from packaging, refrigerators from packaging, etc). Any chance someone can either provide a range of R-values for different examples of commercial applications?


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  1. GBA Editor
    Martin Holladay | | #1

    If you are asking about building code requirements for commercial buildings, I can't help you. But in general, R-4 is OK for a window. R-20 is OK for an exterior wall in a mild climate, and R-27 is a little better for an exterior wall in a mild climate.

    None of the R-values you listed are appropriate for an attic or roof.

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