2015 IBC Min. STC rating

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    David Kaplan

    Qing,
    The answer is 50 unless the exam tells you that the wall has been field tested for airborne noise per ASTM E90. The exam will be clear. It will either tell you that its been field tested, and therefore the answer is 45, or if you are not told this, the answer is 50.

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    Qing Yang

    Thanks David!

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