Patent attributes
An auxiliary pane is attached to a window having an existing primary window pane using a plurality of mounting members, each formed of a first flange and a second flange joined perpendicularly to one another at an apex so as to be substantially L-shaped. The first flange of each mounting member is secured to an inner frame surface of the perimeter frame of the window using a curable adhesive material. A gauge having first and second gauge surfaces at a prescribed distance is used to align the second flanges of the mounting members into a common plane by abutting the first gauge surface against the primary window pane and adjusting each mounting member to abut the second flange thereof to the second gauge surface of the gauge before the curable adhesive material has cured. Once cured, the auxiliary pane is magnetically coupled to the second flanges of the mounting members.