A point-supported cladding system for finishing the exterior of a building or like structure has a plurality of like rigid box-like glazed cladding units. Each cladding unit includes a rigid spacer frame bounding the cladding unit, a pair of parallel light-transmissive glass lites having a thickness of not more than about 9 mm mounted at their periphery on said rigid spacer frame by means of a resilient seal, and a plurality of first attachment elements provided at discrete attachment points on said cladding unit. The cladding unit is dimensioned and configured to have sufficient rigidity to maintain its structural integrity when supported only at the discrete attachment points. A plurality of complementary second attachment elements are provided for mounting on structural members of the building. The complementary attachment elements co-operate and are engagable with the respective first attachment elements to retain the cladding units in a contiguous array on the building and thereby provide an exterior wall of the building. The co-operating first and second attachment elements bear the load of the cladding units and lock the cladding units against movement in a direction normal to the wall while permitting limited freedom of movement of the cladding units relative to each other and the building in a plane parallel to said wall.
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