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An improved mullion for a building system. The mullion has a plurality of peripheral wall and web sections defining a load bearing structure adapted for supporting the panel in sealed engagement therewith. The mullion is roll formed from thin gauged metal and further includes an integrally formed, h

An improved mullion for a building system. The mullion has a plurality of peripheral wall and web sections defining a load bearing structure adapted for supporting the panel in sealed engagement therewith. The mullion is roll formed from thin gauged metal and further includes an integrally formed, hollow body section having portions defining a glazing pocket therein. Structural members are adapted to be disposed within the mullion body for the engagement and structural integrity thereof. The structural members are secured to the mullion body for maintaining the hollow mullion profile under loading conditions.

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1. An improved mullion for a building system of the type wherein said mullion has a plurality of peripheral walls and web sections defining a load bearing structure and is adapted for supporting a panel adjacent thereto in sealed engagement therewith through sealing means secured therealong, the imp

1. An improved mullion for a building system of the type wherein said mullion has a plurality of peripheral walls and web sections defining a load bearing structure and is adapted for supporting a panel adjacent thereto in sealed engagement therewith through sealing means secured therealong, the improvement comprising: said mullion having a generally U-shaped body section; said U-shaped body section being roll-formed from metal and further including a first hollow, integrally formed, generally L-shaped body section and a glazing stop upstanding therefrom: said glazing stop and L-shaped body section being secured one to the other for defining a central glazing pocket therebetween; said L-shaped body section being roll-formed from a width of metal whose edges terminate along a side thereof, said terminating edges being oppositely disposed on a base web portion of said body section, and said terminating edges also being rolled into oppositely disposed lip sections which permit tolerance variations in width of metal within said hollow, L-shaped body section; and an extruded member adapted for being received within said glazing pocket for the sealed engagement of a panel. 2. The apparatus as set forth in claim 1 wherein said L-shaped body section is roll-formed from a width of metal and said glazing stop is roll-formed from another width of metal into a generally C-shaped configuration adapted for matingly engaging said L-shaped body section. 3. The apparatus as set forth in claim 2 wherein said L-shaped body section is constructed with interior web sections wherein a first, transverse web region is formed with an upstanding portion defining a head section adapted for matingly engaging said generally C-shaped glazing stop. 4. The apparatus as set forth in claim 3 wherein said head section is formed with a height measured between said head and said underlying base web portion on the order of one-half or greater of the height of said orthogonal L-shaped portion measured between said base web portion and the end thereof. 5. The apparatus as set forth in claim 3 wherein said roll-formed steel of said C-shaped glazing stop has oppositely disposed terminating edges defining oppositely disposed heel and toe portions adapted for engaging said head section of said L-shaped body section in snap fit interengagement therewith. 6. An improved mullion for a building system of the type wherein said mullion has a plurality of peripheral walls and web sections defining a load bearing structure and is adapted for supporting a panel adjacent thereto in sealed engagement therewith through sealing means secured therealong, the improvement comprising: said mullion having a generally U-shaped body section; said U-shaped body section being roll-formed from metal and further including a first hollow, integrally formed, generally L-shaped body section and a glazing stop upstanding therefrom; said glazing stop and L-shaped body section being secured one to the other for defining a central glazing pocket therebetween; an extruded clip adapted for securement within said hollow L-shaped body section for defining at least a portion of the cross-sectional profile thereof; and an extruded member adapted for being received within said glazing pocket for the sealed engagement of a panel. 7. The apparatus as set forth in claim 6 wherein said extruded clip includes first and second legs extending outwardly from an intermediate web, said first and second legs being formed for engaging oppositely disposed sections of said L-shaped body section in securement therewith to define a profile of said L-shaped body section through structural interengagement therewith. 8. The apparatus as set forth in claim 6 wherein said roll-formed metal is steel. 9. An improved mullion for a building system of the type wherein said mullion has a plurality of peripheral walls and web sections defining a load bearing structure and is adapted for supporting a panel adjacent thereto in sealed engagement therewith through sealing means secured therealong, the improvement comprising: said mullion having a generally U-shaped body section; said U-shaped body section being roll-formed from metal and further including a first hollow, integrally formed, generally L-shaped body section and a glazing stop upstanding therefrom; said glazing stop and L-shaped body section being secured one to the other for defining a central glazing pocket therebetween; and an extruded member adapted for being received within said glazing pocket for the sealed engagement of a panel, said extruded member including a pair of oppositely disposed yoke members adapted for engaging said sealing means. 10. An improved mullion for a building system of the type wherein said mullion has a plurality of peripheral walls and web sections defining a load bearing structure and is adapted for supporting a panel adjacent thereto in sealed engagement therewith through sealing means secured therealong, the improvement comprising: said mullion having a generally U-shaped body section; said U-shaped body section being roll-formed from metal and further including a first hollow, integrally formed, generally L-shaped body section and a glazing stop upstanding therefrom; said glazing stop and L-shaped body section being secured one to the other for defining a central glazing pocket therebetween; and an extruded member adapted for being received within said glazing pocket for the sealed engagement of a panel, said extruded member comprising a glazing adaptor having oppositely disposed yoke regions adapted for engaging said sealing means. 11. The apparatus as set forth in claim 10 wherein said glazing adaptor is constructed of extruded aluminum. 12. The apparatus as set forth in claim 11 wherein said glazing adaptor is constructed of extruded plastic. 13. The apparatus as set forth in claim 10 wherein said L-shaped body section includes first and second orthogonal web regions defining a lateral hollow section of said body section adapted for projecting inwardly within a structure defined by said building system. 14. The apparatus as set forth in claim 13 wherein said L-shaped body section comprises at least four generally orthogonal web regions defining opposite cornered sections thereof and the internal and external perimeter of said mullion of said building system. 15. An improved mullion for a building system of the type wherein said mullion has a plurality of peripheral walls and web sections defining a load bearing structure and adapted for supporting a panel adjacent thereto in a sealed engagement therewith through sealing means secured therealong, the improvement comprising said mullion being roll-formed from thin gauged metal and further including a first, integrally formed, hollow, generally L-shaped body section and a glazing stop upstanding therefrom with said glazing stop and L-shaped body section being secured one to the other for defining a central glazing pocket therebetween, said mullion further including at least one mounting member adapted for being received within said hollow mullion for structural interengagement therewith, said mounting member comprising a shear block adapted for providing direct interengagement between orthogonally disposed mullions. 16. The apparatus as set forth in claim 15 wherein said mullions include vertical and horizontal mullions and said shear block is adapted for being secured within opposite ends of said horizontal mullion for direct interengagement with and securement to said vertical mullion for facilitating the orthogonal relationship therebetween. 17. An improved mullion for a building system of the type wherein said mullion has a plurality of peripheral walls and web sections defining a load bearing structure and adapted for supporting a panel adjacent thereto in a sealed engagement therewith through sealing means secured therealong, the improvement comprising said mullion being roll-formed from thin gauged metal and further including a first, integrally formed, hollow, generally L-shaped body section and a glazing stop upstanding therefrom with said glazing stop and L-shaped body section being secured one to the other for defining a central glazing pocket therebetween, said mullion further including at least one mounting member adapted for being received within said hollow mullion structural interengagement therewith, said mounting member including a support clip adapted for positioning within said hollow mullion at an intermediate point therealong for maintaining the cross-sectional profile thereof and affording structural integrity thereto. 18. An improved mullion for a building system of the type wherein said mullion has a plurality of peripheral walls and web sections defining a load bearing structure and adapted for supporting a panel adjacent thereto in a sealed engagement therewith through sealing means secured therealong, the improvement comprising said mullion being roll-formed from thin gauged metal and further including a first, integrally formed, hollow, generally L-shaped body section and a glazing stop upstanding therefrom with said glazing stop and L-shaped body section being secured one to the other for defining a central glazing pocket therebetween, said mullion further including at least one mounting member adapted for being received within said hollow mullion for structural interengagement therewith, said mounting member comprising an extruded element. 19. The apparatus as set forth in claim 18 wherein said extruded element is formed from aluminum in a configuration adapted for maximizing the structural support of said hollow mullion. 20. A mullion system operable to support a panel under loading conditions, said mullion system comprising: a mullion body member formed of thin gauged, roll-formed metal, said body member having portions defining a glazing pocket and a hollow profile therealong; means for mounting said panel within said glazing pocket of said body member; a structural member adapted to be disposed within said mullion body member for the engagement and structural integrity thereof; means for securing said structural member to said mullion body member for maintaining said mullion profile under said loading conditions; and said mullion comprising a horizontal mullion adapted to be secured to a vertical mullion and said structural member comprising a shear block adapted to be positioned within opposite ends of said horizontal mullion and securement to said vertical mullion for structurally supporting said horizontal mullion in generally orthogonal relationship to said vertical mullion. 21. The apparatus as set forth in claim 20 wherein said shear block comprises extruded aluminum structural elements adapted for facilitating the structural interengagement and support of said mullion. 22. A mullion system operable to support a panel under loading conditions, said mullion system comprising: a mullion body member formed of thin gauged, roll-formed metal, said body member having portions defining a glazing pocket and a hollow profile therealong; means for mounting said panel within said glazing pocket of said body member; a structural member adapted to be disposed within said mullion body member for the engagement and structural integrity thereof; means for securing said structural member to said mullion body member for maintaining said mullion profile under said loading conditions; and said structural member comprising a clip adapted for placement within an intermediate region of said hollow mullion for securing said thin gauge roll-formed metal portions thereof in said profile and providing structural integrity thereto whereby said profile is maintained under load. 23. The apparatus as set forth in claim 22 wherein said structural clip is an extruded aluminum element adapted for engaging roll-formed metal portions of said body member and maintaining said mullion profile. 24. A mullion system operable to support a panel under loading conditions, said mullion system comprising: a mullion body member formed of thin gauged, roll-formed metal, said body member having portions defining a glazing pocket and a hollow profile therealong; means for mounting said panel within said glazing pocket of said body member; a structural member adapted to be disposed within said mullion body member for the engagement and structural integrity thereof; means for securing said structural member to said mullion body member for maintaining said mullion profile under said loading conditions; and said mullion system including both vertical and horizontal mullions adapted for interconnection in generally orthogonal relationship one to the other, said structural members comprising a plurality of shear blocks adapted for securement in opposite ends of said horizontal mullions for facilitating structural interengagement with said vertical mullions, and at least one structural clip adapted for intermediate positioning within said horizontal mullion for maintaining the cross-sectional mullion profile thereof and, wherein at least one of said shear blocks further includes a depending leg section adapted for extending beneath said horizontal mullion in which it is disposed for interengagement with a support surface therebeneath for supporting said mullion system with said shear blocks. 25. The apparatus as set forth in claim 24 wherein said horizontal member within which said shear blocks having depending leg regions are disposed comprises a sill, and wherein said mullion system further includes flashing adapted for positioning beneath said sill, said shear block legs being adapted for resting upon said flashing whereby said horizontal and vertical mullions are disposed above said flashing and said underlying surface.