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A demountable wall system includes similarly configured channel segments having a hat-shaped center, a pair of center flanges, and L-shaped outer ends with fastener portions formed therein. A rigid stud having an I-shaped plan configuration is formed from a pair of the channel segments interconnecte

A demountable wall system includes similarly configured channel segments having a hat-shaped center, a pair of center flanges, and L-shaped outer ends with fastener portions formed therein. A rigid stud having an I-shaped plan configuration is formed from a pair of the channel segments interconnected in a back-to-back relationship, wherein adjacent end flanges form outer stud faces against which wall panels are supported, and adjacent fastener portions form connector channels in which the wall panels are detachably retained. A header/footer track is formed from a channel segment connected with a flat base strip, and is attached to the opposite ends of the stud by stud extenders to define a frame on which the wall panels are supported.

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The invention claimed is as follows: 1. In a demountable wall of the type having vertical support members mounted between horizontal header and footer members to define a rigid frame on which wall panels are supported to cover at least a portion of said frame, the improvement comprising: a pluralit

The invention claimed is as follows: 1. In a demountable wall of the type having vertical support members mounted between horizontal header and footer members to define a rigid frame on which wall panels are supported to cover at least a portion of said frame, the improvement comprising: a plurality of rigid, similarly configured channel segments, each having a hat-shaped central portion defined by a flat web, a pair of legs extending outwardly from opposite sides of said web and a pair of center flanges disposed generally parallel with said web and extending from outer ends of said legs, as well as a pair of L-shaped outer portions having end flanges disposed generally perpendicular with said web, and inwardly turned connector flanges projecting inwardly from interior sides of said end flanges and including fastener portions formed therein; a rigid vertical stud having a generally I-shaped plan configuration and comprising a pair of said channel segments disposed in a back-to-back relationship with said webs laterally aligned and rigidly interconnected, such that the adjacent ones of said end flanges of said pair of channel segments define outer stud faces against which said wall panels are supported, and the adjacent ones of said fastener portions on said connector flanges of said pair of channel segments define therebetween connector channels in which associated connector portions of said wall panels are securely, yet detachably, retained; and a rigid horizontal track shaped for connection with one of the ends of said stud, and comprising one said channel segment and a generally flat base strip, which are disposed in a back-to-back laterally aligned relationship, with said base strip rigidly connected with said web of said one channel segment. 2. A demountable wall as set forth in claim 1, wherein: said base strip has a width substantially commensurate with the width of said one channel segment, such that said base strip and said fastener portion on said connector flange of said one channel segment define therebetween a second connector channel shaped to securely, yet detachably, retain a trim member therein. 3. A demountable wall as set forth in claim 2, wherein: at least one of said wall panels has a core width which spans between and overlaps at least portions of said outer stud faces to provide full width sound attenuation and fire resistance. 4. A demountable wall as set forth in claim 3, wherein: at least one of said wall panels includes: a rigid pan-shaped exterior shell member having a generally flat face with inwardly turned sidewalls defining a channel therebetween; and a panel-shaped interior core member positioned in said channel and connected with said exterior shell member. 5. A demountable wall as set forth in claim 4, wherein: said exterior shell member includes connector strips protruding outwardly from said sidewalls of said exterior shell member and having terminal end portion thereof defining said connector portions and being closely received in associated ones of said connector channels of said stud. 6. A demountable wall as set forth in claim 5, wherein: said stud has a predetermined width measured between said outer stud faces of around 3⅝ inches to accommodate conventional building wall accessories. 7. A demountable wall as set forth in claim 6, wherein: said wall panels each have a predetermined thickness of around ⅝ inches to accommodate conventional building wall accessories. 8. A demountable wall as set forth in claim 7, wherein: said sidewalls of adjacent ones of said wall panels mate in a flush relationship when assembled on said stud to define a finished, trim-free junction. 9. A demountable wall as set forth in claim 8, wherein: at least one of said wall members has said interior core member constructed from gypsum board; and said one of said wall panels includes a decorative film adhered to an exterior face of said exterior shell member. 10. A demountable wall as set forth in claim 9, including: at least one L-shaped connector having a vertical leg portion thereof detachably connected with said webs of said stud and a horizontal leg portion thereof detachably connected with said track. 11. A demountable wall as set forth in claim 10, wherein: said vertical and horizontal leg portions of said connector have a width configured for close reception between said legs of said channel segments. 12. A demountable wall as set forth in claim 11, wherein: said stud includes a plurality of apertures extending laterally through said webs in a longitudinally spaced apart arrangement along said stud. 13. A demountable wall as set forth in claim 12, including: at least one rigid spacer bar having a length shaped to span horizontally between adjacent ones of said studs, with a pair of connector tongues projecting outwardly from opposite ends thereof which are received in associated ones of said apertures in said studs to detachably support said spacer bar between said studs to laterally rigidify said frame. 14. A demountable wall as set forth in claim 13, wherein: said spacer bar has a length configured for fastenerless, drop-into-place insertion into said apertures in said studs. 15. A demountable wall as set forth in claim 14, wherein: said spacer bar includes a pair of laterally extending notches on outer edge portions of said connector tongues which receive said webs of said studs therein to positively, yet detachably, retain said adjacent studs in a predetermined laterally spaced apart relationship. 16. A demountable wall as set forth in claim 15, wherein: said spacer bar has a generally U-shaped lateral cross-sectional configuration to facilitate routing utilities therealong. 17. A demountable wall as set forth in claim 16, wherein: said spacer bar includes a plurality of vertically extending apertures therethrough to facilitate routing of utilities through said frame. 18. A demountable wall as set forth in claim 17, including: a plurality of toggle locks interconnecting said webs in said stud. 19. A demountable wall as set forth in claim 18, including: a plurality of toggle locks interconnecting said base strip with said channel segment in said track. 20. A demountable wall as set forth in claim 19, including: a first trim member shaped to cover selected portions of an associated one of said wall panels and having a connector portion thereof detachably retained in an associated one of said connector channels in said stud. 21. A demountable wall as set forth in claim 20, including: a second trim member shaped to cover selected portions of an associated one of said wall panels and having a connector portion thereof detachably retained in said second connector channel in said track. 22. A demountable wall as set forth in claim 21, wherein: each of said channel segments includes a pair of generally U-shaped, inwardly protruding ribs disposed between said legs and said center flanges which rigidify said channel segments. 23. A demountable wall as set forth in claim 22, wherein: each of said channel segments includes a pair of generally V-shaped, outwardly opening troughs disposed along outer portions of said center flanges adjacent to said end flanges. 24. A demountable wall as set forth in claim 23, wherein: said connector flanges of each of said channel segments include an angled outer portion arranged to facilitate insertion of a connector into said connector channel, and a generally U-shaped, inwardly opening inner portion arranged to detachably capture a connector in said connector channel. 25. A demountable wall as set forth in claim 24, wherein: said base strip portion of said track includes reverse bent side edges extending along a bottom side of said track to add rigidity to said track. 26. A demountable wall as set forth in claim 25, wherein: said connector includes an aperture extending laterally through said vertical leg portion to facilitate routing wiring therethrough. 27. A demountable wall as set forth in claim 1, including: at least one rigid spacer bar having a length shaped to span horizontally between adjacent ones of said studs, with a pair of connector tongues projecting outwardly from opposite ends thereof which are received in associated apertures in said studs to detachably support said spacer bar between said studs to laterally rigidify said frame. 28. A demountable wall as set forth in claim 1, including: at least one trim member shaped to cover selected portions of an associated one of said wall panels and having a connector portion thereof detachably retained in said connector channel in said stud. 29. A demountable wall as set forth in claim 2, including: at least one trim member shaped to cover selected portions of an associated one of said wall panels and having a connector portion thereof detachably retained in said second connector channel in said track.