Abstract: Materials and a method for attaching insulating material to roof ridge ventilators to prevent warm attic air from being exhausted through the louvered openings in such roof ridge ventilator systems during cool weather. At least two lengths of flexible molding material and a plurality of wire-like clamps. The wire-like clamps extend across the top of the roof ridge ventilator with each end being secured between the molding and the outer flashing portions of the roof ridge ventilator so as to secure the molding flush against vent openings in the underside surface of the roof ridge ventilator to completely block air flow therefrom.