A glazing shield system and a method for retrofitting glazing systems of buildings are disclosed. The glazing shield system comprises a support frame and a unitized panel. In certain embodiments, the glazing shield system may be mounted on an existing glazing system in a non-intrusive and non-destructive method. In one embodiment, the support frame may be attached to an infill panel of an existing glazing system using structural adhesives, and the unitized panel may be mounted on the support frame, creating an insulating glazing shield.