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A truss system for roofing a building; a truss of said truss system including at least one truss segment; each said truss segment comprising a first elongate element and a second elongate element; said first and second elongate elements interconnected at intervals by a series of fish-plate assemblie

A truss system for roofing a building; a truss of said truss system including at least one truss segment; each said truss segment comprising a first elongate element and a second elongate element; said first and second elongate elements interconnected at intervals by a series of fish-plate assemblies; said fish-plate assemblies arranged in sliding engagement with respective extruded fish-plate channels of said first and second elongate elements.

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1. A truss system for roof or façade panels of a building; a truss of said truss system including at least one truss segment; each said truss segment comprising a first elongate element and a second elongate element; said first and second elongate elements interconnected at intervals by a series of

1. A truss system for roof or façade panels of a building; a truss of said truss system including at least one truss segment; each said truss segment comprising a first elongate element and a second elongate element; said first and second elongate elements interconnected at intervals by a series of fish-plate assemblies; each fish-plate assembly of said series of fish-plate assemblies comprising a pair of fish-plates arranged back-to-back and touching each other when in use; each fish-plate comprising a planar plate portion provided at respective upper and lower edges with flanges projecting outwardly and normal to an outer surface of said planar plate portion; each of said fish-plates engaging at opposite ends with respective extruded fish-plate channels of said first and second elongate elements; said fish-plate channels formed so as to retain said fish-plate assemblies by capture of said flanges when said pair of fish-plates are assembled back-to-back; and wherein each said first and second elongate element of a said truss segment comprises an extruded section; said extruded section including a panel retaining channel and said extruded fish-plate channel; andcomprising an interconnected pair of said truss segments wherein the respective extruded section of each truss segment further includes a connector plate slot; the respective connector plate slots of the pair of truss segments adapted for friction fit insertion of a connector plate for interconnecting the pair of truss segments; andwherein said panel retaining channel includes panel retaining elements; said panel retaining elements formed along outer edges of said panel retaining channel; said panel retaining elements directed inwards towards a median plane of said panel retaining channel. 2. The truss system of claim 1, wherein a said extruded section further includes a cable channel; said cable channel adapted to receive a free-running tensioning cable. 3. The truss system of claim 2, wherein said tensioning cable comprises stainless steel wire rope. 4. The truss system of claim 1, comprising a pair of adjacent panels, each adjacent panel having a retaining flange element, and wherein a said truss supports said retaining flange elements in said panel retaining channels; said panel retaining elements locking respective said flange elements of the adjacent panels into said panel retaining channel as a snap fit. 5. The truss system of claim 1, wherein a said truss supports said panels along said first or second elongate elements of said truss or along both said first and second elongate elements of said truss. 6. The truss system of claim 1, wherein said panels interconnect adjacent ones of said trusses; said panels fulfilling the function of purlins. 7. The truss system of claim 1, wherein said first and second elongate elements of said truss comprise aluminum extrusions. 8. The truss system of claim 1, wherein fish-plates of said fish-plate assemblies comprise stainless steel pressings. 9. The truss system of claim 1, wherein said panels comprise transparent or translucent polymer panels. 10. The truss system according to claim 1, wherein: the series of fish-plate assemblies includes one or more short fish-plate assemblies;the flanges are captured in said fish-plate channels; andabutting truss segments are connected together by means of a long fish-plate assembly. 11. The truss system of claim 10, wherein said long fish-plate assembly comprises a back-to-back assembly of two long fish-plates; each said long fish-plate comprising a central section; said long fish-plate assemblies including extension arms extending from upper and lower portions of said central section; said central section and said extension arms provided with respective upper and lower series of through holes. 12. The truss system of claim 11, wherein said central section is provided with outwardly projecting flange elements at an upper edge and a lower edge of said central section such that when said long fish-plates are assembled in said back to back assembly said outwardly projecting flange elements project outwardly from said assembly. 13. The truss system of claim 11, wherein said outwardly projecting flange elements engage with said extruded fish-plate channels of said first and second elongate elements. 14. The truss system of claim 11, wherein half of a length of a said long fish-plate assembly is secured in said extruded fish-plate channels of a first said truss segments by bolts passing through flange elements of said first and second elongate elements and said through holes; a second half of said length of said long fish-plate assembly secured in said fish-plate channels of an adjoining said truss segment by bolts passing through flange elements of said first and second elongate elements and said through holes. 15. The truss system of claim 1, wherein each of the fish-plate channels projects outwardly from an outer surface of the respective first and second elongate elements. 16. The truss system of claim 15, wherein the fish-plate channels are formed so as to frictionally retain the fish-plate assemblies without requiring bolts.