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Attic Venting

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The UBC specifies that attic ventilation is required "where determined
necessary by the building official". I'm trying to determine which
cities, counties, etc. would require ventilation for a roof with an
enclosed rafter design using 2x12 solid rafters, with ceiling board
applied directly to the underside of rafters. The ceiling board would
have a vapor barrier not exceeding 1 perm installed on the warm side.

Any information regarding what jurisdictions either require or do not
require attic ventilation for this type of design would be appreciated.