Multiple layer insulated glazing units

A multiple pane insulated sealed glazing unit comprising two or more glazing sheets, said sheets being maintained in an essentially parallel and spaced apart relationship to each other by a peripheral resilient spacing and sealing assembly, defining an insulating airspace between said sheets, which spacing and sealing assembly comprises an inner spacer strip sandwiched between said sheets, and located inwardly of the glazing edges, thereby creating an outwardly facing perimeter channel therebetween;

• said inner spacer strip being composed of a moisture permeable flexible or semi-rigid silicone foam material preformed to have, when in the uncompressed condition, two opposite sides spaced so as to provide the desired spacing of said glazing sheets and containing desiccant material, said spacer strip having a preapplied ultra-violet resistant acrylic pressure sensitive adhesive on said opposite sides thereof and which abut said sheets, and having an inwardly directed face which is resistant to ultra-violet radiation, and having physical properties which permit said spacer strip to be coiled for storage;
• and
• said spacing and sealing assembly further comprising an outer sealant filling said outer perimeter channel.