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Architectural concrete columns and beams can be used structurally to form a primary frame in their own right or not. The casting orientation (horizontal and vertical cast) of the columns will be determined by a number of factors such as dimensions, visible faces, cast-in features or inserts, production restrictions etc. It should be noted that units cast vertically will have a slightly different appearance to those cast horizontally. 

Precast concrete balcony units are generally cast in their in-situ orientation to ensure the best (architectural) finish to the visible underside and edges. The top face is trowelled smooth, often to falls which allow water run of to preformed / integrated gutters and outlets. This trowelled top face can additionally have an acid-etched, grit-blasted or retarded finish. Alternatively it can be left un-treated for a site applied finish or covering. 

Spandrel panels generally span between column positions and can be either structural (transfer of floor-slab loads to the columns) or non-structural.

Perform purely an aesthetic function and can be used for a number of shapes and forms such as mullions, spandrels, parapets, columns casings etc. A suitable primary support structure (steel or concrete) will need to be provided for this type of element. This will need to extend (at floor and column locations) to within close proximity of the rear face of the cladding and to achieve this some secondary steel work may be required.