CYCLONE SPRAY FOAMING TEAM, removed and cleaned a big attic whom had existing wood chips (a form of insulation in the old day) and no vapor barrier. Once the attic space was cleaned, CSF applied a layer of spray polyurethane foam insulation to seal the attic, and followed with blown insulation over top. Spray foam acts as a vapor barrier, with that send no traditional 6 mil poly vapor barrier is needed for this attic.