The present invention relates to a finishing form of a prefabricated terrazzo for stair construction, which covers the exposed surface of the railing side of the terrazo prefabricated on the stair foundation of a concrete building, and simultaneously forms a water barrier. In the construction of the horizontal and vertical planes of the stair foundation in horizontal and vertical terrazzo,;It is formed in the "a" shape so as to cover the cutting edge side of each of the horizontal terrazzo and vertical terrazzos assembled in the "a" shape on the horizontal and vertical surfaces of the stair foundation, and also the thickness of each of the horizontal and vertical terrazzo A cover portion having a larger width;;A support protrusion piece which protrudes from the middle of the rear surface of the cover part and is supported on the upper surface of the horizontal terrazzo and the front surface of the vertical terrazzo; A concealed stone piece that protrudes longer from the inner end of the cover part toward the handrail side wall of the staircase base than the supporting stone piece; As the outer end of the cover portion is formed integrally with a water barrier that protrudes higher than the upper surface of the horizontal terrazzo and the front surface of the vertical terrazzo, the horizontal terrazzo by the silicone caulking agent applied to the support stone piece and the water barrier The invention is characterized in that the adhesive is fixed to the vertical terrazzo.
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