The assembly has a central bar (1) with a T shape cross section, a monoblock assembly (M) with two side bars (2, 3). The bar (1) is embedded on the assembly (M), so that the base of the bar (1) is positioned between the side bars, and two flanges (lb, lc) of the bar are in support against the side bars. A surface coating (4) is applied on the set of bars. A groove (G) is arranged between the side bars and the central bar. The coating masks two interstices (6, 6`) once applied. An independent claim is also included for a method to install a multifunction finishing assembly.
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