Abstract: A multiple pane glass unit for butt-glazing comprising an exterior glass sheet spaced apart from an interior glass sheet by horizontal head and sill spacers and a pair of vertical structural spacers, with the vertical spacers being constructed and arranged to provide structural support for the glass sheets against wind loads and the like and a first gasket strip mounted on a first vertical structural spacer, with a second, mating gasket strip mounted on a second vertical structural spacer, with the first and second gasket strips being arranged to contact one another along the vertical joints of side-abutting glass units to form a butt joint and being constructed and arranged to be substantially flush with the exterior glass sheets and to provide a weatherseal joint along the abutting vertical edges thereof, said gaskets being applied to the glass unit prior to installation and eliminating the need for an exterior applied wet weatherseal.

Abstract: A multiple pane glass window unit comprising an outboard glass sheet spaced apart from an inboard glass sheet, spacer members positioned between and connected to the horizontal and vertical portions of the glass sheets to space them apart, said spacer members including a horizontal head spacer member connected to a horizontal sill spacer member by a pair of spaced-apart vertical side spacer members, said vertical side spacer members spacing apart the glass sheets and stiffening and supporting the side edge portions of the glass sheets against pressures of wind and rain and the elements, and factory-affixed gasket members attached to the vertical edges of the side spacer members for sealing the vertical space between side-abutting window units, said gasket members being adapted to be compressed between the sides of side-abutting window units, said side spacer members including a side spacer member that is U-shaped in cross-section with the legs of the U facing sideways from the window unit, a foam spacer tape