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  1. BldgDesignr

    Vapor Barrier for Flat Roof

    The problem we face is that on the 3rd and 4th floors of a 4 story building (the bottom two floors are open parking deck), condensation is forming on air grills located in the drop ceiling. This only occurs on days that are over 100 degree F. The design temp is 96 Degrees F. We are trying to...
  2. BldgDesignr

    Vapor Barrier for Flat Roof

    Where can I find the calculation to determine if a vapor barrier is required for a flat roof? What reference?

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