Owens Corning's raft-R-mate® attic vent is an extruded polystyrene foam vent designed to assure unrestricted airflow from the soffit to the ridge vent. Additionally, raft-R-mate® attic vent has an optional bend down air stop/insulation block at the top plate of the wall. The optional air stop/insulation block prevents loose fill insulation from filling the eave space during installation of cathedral ceiling or attic floors, by closing off the opening below the raft-R-mate® attic vent to the soffit. It also helps to prevent "wind wash" which can cause attic insulation to be blown back off of the top plate causing unwanted heat loss around the perimeter of the attic.