Attic Vent Calculation

Based on CBC 2007, Section 1203.2 we have an exception of calculating the vent area by area/300 as long as we have a vapor retarder having a transmission rate not exceeding 1 perm in accordance of ASTM E 96 is installed on warm side of the attic insulation.

As we are doing the project in the bay area, which does not go to freezing temperatures can we omit this vapor retarder and still use the exception.

Need advice of this.
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