Abstract: A window structure comprises a fame and an inwardly opening window leaf of a multi glazing type composed of a wooden casement as well as two glass panes. The outer glass pane consists of safety glass, e.g. tempered or laminated glass and the casement which carries the inner glass pane being in its entirety located on the inside of the outer glass pane and connected thereto, the outer glass pane having, in the closed state of the window leaf, its edge portions located between the casement and inwardly facing shoulder surfaces on the frame.

Abstract: An insulating spacer for use in glazing assemblies is provided. The spacer comprises a foamed insulating body and further includes a second sealant material. The insulating body partially contacts the substrates as does the sealant to provide a double seal when used in a glazing assembly. In other embodiments the spacer is a composite of foam, sealant material, rigid plastics and desiccated matrices. A further embodiment discloses an undulating foam spacer body for easy manipulation about the corner in glazing assemblies. The result of incorporation of the foam is a substantially energy efficient spacer and assembly.