Do I need a vapor barrier for blow-in fiberglass in vented attic 4a

Hi, I am in zone 4a.Do I need a vapor barrier in new constrction between cealing and blow-in fiberglass on a vented attic?I have a bunch of blow-in fiberglass I… Hi, I am in zone 4a.Do I need a vapor barrier in new constrction between cealing and blow-in fiberglass on a vented attic?I have a bunch of blow-in fiberglass I…Read MoreGreenBuildingAdvisor