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1:300

  1. H

    R806.2 exceptions, balance high/low vents, ambiguous language

    1:150 rule does not require a 50:50 balance upper vs lower. 1:300 requires approx 50:50 balance. So a 3000sf attic requires 10sf of venting IF 5 to 6sf are lower, and 4 to 5sf are upper (min 40% max 50% in upper third). So 8sf upper and 2sf lower breaks this rule. That much is clear. Also 2sf...
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