Abstract: A retroglazed glass pane of a window, wherein a spacing element, which is attached and sealed to the peripheral portion of a face of a new or second pane slightly smaller than the original light of the first or existing pane, is bonded to the confronting face of the first pane in a position such that a space remains between the sash elements and the edge of the second pane and the radially outward side of the spacing element, wherein such space is partially filled with a sealant material, which seals between the spacer and the first pane, and which such space is further filled with a resiliently compressible rod, typically of a rubberlike foam material, the rod being preferably characterized by low thermal conductivity; and a method of retroglazing wherein a desiccant is contained in such spacing element, protected against exposure prior to installation of the second pane, and wherein such rod is forced into the space between the edge of the second pane and the sash to force sealant material pre-deposited in